oracle.adf.model.generic
Class DCRowSetIteratorImpl

java.lang.Object
  oracle.jbo.common.PropertiesHelper
      oracle.jbo.common.RowSetHelper
          oracle.adf.model.generic.DCRowSetIteratorImpl

All Implemented Interfaces:

NavigatableRowIterator, Properties, RowIterator, RowSetIterator

Direct Known Subclasses:

DCGenericRowSetIteratorImpl

public class DCRowSetIteratorImpl

extends RowSetHelper

implements RowSetIterator

Version:

INTERNAL

Field Summary

protected java.util.List	dataRows
protected java.lang.String	mAccessorName
protected DCDataControl	mApp
protected Row	mCurrentRow
protected java.lang.Object	mProvider
protected java.util.Iterator	mProviderIter
protected StructureDef	mStructureDef
static int	REQ_FIRST
static int	REQ_LAST
static int	REQ_NEXT
static int	REQ_PREVIOUS

Fields inherited from class oracle.jbo.common.RowSetHelper

listeners, mMgmtListeners, mName

Fields inherited from class oracle.jbo.common.PropertiesHelper

mProperties

Fields inherited from interface oracle.jbo.RowIterator

ITER_MODE_LAST_PAGE_FULL, ITER_MODE_LAST_PAGE_PARTIAL, SLOT_BEFORE_FIRST, SLOT_BEYOND_LAST, SLOT_DELETED, SLOT_VALID

Constructor Summary

protected	DCRowSetIteratorImpl(DCDataControl dc, java.util.Collection coll, java.lang.String name)
protected	DCRowSetIteratorImpl(DCDataControl dc, java.util.Iterator iter, java.lang.String name)
protected	DCRowSetIteratorImpl(DCDataControl dc, java.lang.Object data, java.lang.String name)
	DCRowSetIteratorImpl(DCDataControl dc, java.lang.Object data, java.lang.String name, StructureDef def)

Method Summary

void	clearCurrentData() for internal framework use only.
void	closeRowSetIterator() Closes this row set iterator.
protected boolean	containsRow(Row row)
Row	createAndInitRow(AttributeList nvp) Creates and initializes a new Row object, but does not insert it into the Row Set.
RowSet	createDetailRowSet(java.lang.String rsName, java.lang.String linkDefName) Create a row set for the view link.
Key	createKey(AttributeList nvp) Given a list of name-value pairs, creates a Key object that matches the key structure for the ViewObject for this RowItertor.
Key	createKey(java.lang.String stringifiedKey)
Row	createRow() Creates a new Row object, but does not insert it into the Row Set.
java.util.Enumeration	enumerateRowsInRange() Gets an Enumeration of all rows in the Row Set.
protected java.lang.Object	fetchProvider()
Row[]	findByEntity(int eRowHandle, int maxNumOfRows) Finds and returns View rows that use the Entity row, identified by the Entity row handle, eRowHandle.
Row[]	findByKey(Key key, int maxNumOfRows) Finds and returns View rows that match the specified key.
Row	first() Gets the first row in the iterator.
java.lang.String	getAccessorName()
Row[]	getAllRowsInRange() Extracts the rows in the range.
Row	getCurrentRow() Accesses the current row.
int	getCurrentRowIndex() Gets the absolute index (not range index) of the current row.
int	getCurrentRowSlot() Gets the slot status of the current row.
protected DCDataControl	getDataControl()
java.lang.Object	getDataProvider()
RowSet[]	getDetailRowSets() Get all detail row sets.
int	getEstimatedRangePageCount() Returns getEstimatedRowCount()/rangePageSize, if rangeSize > 0.
int	getFetchedRowCount() Counts the number of rows fetched from database into the Row Set collection up to this point.
Row[]	getFilteredRows(java.lang.String attrName, java.lang.Object attrValue) Returns all rows in this collection whose attribute value matches the value being passed in attrValue.
Row[]	getFilteredRowsInRange(java.lang.String attrName, java.lang.Object attrValue) Returns all rows in this range whose attribute value matches the value being passed in attrValue.
int	getIterMode() Gets the current iteration mode.
protected com.sun.java.util.collections.ArrayList	getListenersList()
java.lang.String	getName() Gets the name of the Iterator.
Row[]	getNextRangeSet() Gets the next set of rows in the range.
Row[]	getPreviousRangeSet() Gets the previous set of rows in the range.
java.util.Hashtable	getProperties() Gets the table of properties.
java.lang.String	getProviderMethodResultName()
int	getProviderMethodResultUseCount()
int	getRangeIndexOf(Row row) Get the index of the given row relative to the beginning of the range.
int	getRangeSize() Gets the size of the Row Set Iterator range.
int	getRangeStart() Gets the absolute row index of the first row in the Row Set Iterator range.
Row	getRow(Key key) Locates and returns a row by its unique key.
Row	getRowAtRangeIndex(int rangeIndex) Accesses a row through its range index.
int	getRowCount() Counts the total number of rows in the Row Set.
int	getRowCountInRange() Gets the size of the Row Set Iterator range.
RowSet	getRowSet() Gets the Row Set that this Iterator belongs to.
RowSetIterator	getRowSetIterator()
StructureDef	getStructureDef()
java.lang.Object	getSyncLock() Gets the locking object for this Row Set Iterator.
boolean	hasNext() Tests for the existence of a row after the current row.
boolean	hasPrevious() Tests for the existence of a row before the current row.
void	insertRow(Row row) Inserts a row to the Row Set, before the current row.
void	insertRowAtRangeIndex(int rangeIndex, Row row) Inserts a row to the Row Set at the given range index.
protected Row	internalCreateRowInstanceFor(java.lang.Object rowData)
boolean	isNameGenerated() Tests if the Iterator's name was generated by the system.
boolean	isRangeAtBottom() Tests if the Row Set Iterator range is at the end of the result set.
boolean	isRangeAtTop() Tests if the Row Set Iterator range is at the beginning of the result set.
boolean	isRowValidation() Gets the validation flag on this iterator.
Row	last() Gets the last row in the iterator.
Row	next() Gets the next row in the iterator.
protected void	notifyNavigationEvent(Row srcRow, Row dstRow)
void	notifyRangeRefreshed(int rangeStart)
Row	previous() Gets the previous row in the iterator.
void	rebuildIteratorUpto(int index) Creates a new Iterator over the dataSource (if the datasource itself is not an Iterator) and resets the currency to the given index.
void	removeCurrentRow() Removes the current Row object from the Row Set.
Row	removeCurrentRowAndRetain() Removes the current Row object from the collection and retain it for insertion into another location.
void	removeCurrentRowFromCollection() Removes the current Row object from the collection.
void	reset() Moves the currency to the slot before the first row.
int	scrollRange(int amount) Moves the Row Set Iterator range up or down a given number of rows.
int	scrollRangeTo(Row row, int index) Scrolls the range to place a given row at a given range index.
int	scrollToRangePage(int pageIndex) Moves the row set range start to the given page index where every page consists of RangeSize number of rows.
void	setAccessorName(java.lang.String accName)
boolean	setCurrentRow(Row row) Designates a given row as the current row.
boolean	setCurrentRowAtRangeIndex(int rangeIndex) Designates a given index as the current row.
void	setIterMode(int mode) Sets the iteration mode for this Row Iterator.
void	setProviderMethodResultName(java.lang.String name)
void	setProviderMethodResultUseCount(int count)
int	setRangeSize(int size) Modifies the size of the Row Set Iterator range.
int	setRangeStart(int start) Moves the Row Set Iterator range.
void	setRowValidation(boolean flag) Sets the validation flag on this iterator.
protected int	syncIterator(int index)
protected boolean	useListAdapter() Let a subclass decide if the ListAdapter should be used to avoid creating an iterator over the original list.

Methods inherited from class oracle.jbo.common.RowSetHelper

addListener, addManagementListener, fireMgmtIteratorClosed, fireMgmtIteratorReset, fireNavigationEvent, fireRangeRefreshed, fireRangeScrolled, fireRowDeleted, fireRowInserted, fireRowUpdated, getListeners, getManagementListenersList, hasListeners, hasManagementListeners, removeListener, removeManagementListener, setName

Methods inherited from class oracle.jbo.common.PropertiesHelper

getProperty, refreshProperty, setProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface oracle.jbo.RowSetIterator

addManagementListener, removeManagementListener

Methods inherited from interface oracle.jbo.NavigatableRowIterator

addListener, removeListener

Field Detail

mApp

protected DCDataControl mApp

dataRows

protected java.util.List dataRows

mProvider

protected java.lang.Object mProvider

mProviderIter

protected java.util.Iterator mProviderIter

mStructureDef

protected StructureDef mStructureDef

mAccessorName

protected java.lang.String mAccessorName

mCurrentRow

protected Row mCurrentRow

REQ_FIRST

public static final int REQ_FIRST

See Also:

Constant Field Values

REQ_PREVIOUS

public static final int REQ_PREVIOUS

See Also:

Constant Field Values

REQ_NEXT

public static final int REQ_NEXT

See Also:

Constant Field Values

REQ_LAST

public static final int REQ_LAST

See Also:

Constant Field Values

Constructor Detail

DCRowSetIteratorImpl

protected DCRowSetIteratorImpl(DCDataControl dc,
                               java.util.Collection coll,
                               java.lang.String name)

DCRowSetIteratorImpl

protected DCRowSetIteratorImpl(DCDataControl dc,
                               java.util.Iterator iter,
                               java.lang.String name)

DCRowSetIteratorImpl

protected DCRowSetIteratorImpl(DCDataControl dc,
                               java.lang.Object data,
                               java.lang.String name)

DCRowSetIteratorImpl

public DCRowSetIteratorImpl(DCDataControl dc,
                            java.lang.Object data,
                            java.lang.String name,
                            StructureDef def)

Method Detail

getSyncLock

public final java.lang.Object getSyncLock()

Description copied from interface: RowSetIterator

Gets the locking object for this Row Set Iterator. Actually, this method locks the Application Module to which this Row Set Iterator belongs. See ApplicationModule.getSyncLock() for details.

Specified by:

getSyncLock in interface RowSetIterator

Returns:

the locking object.

getName

public java.lang.String getName()

Description copied from interface: RowSetIterator

Gets the name of the Iterator. If this Row Set Iterator is the default iterator of the Row Set, then the Iterator's name by default is the same as the Row Set name. For a secondary (non-default) Iterator of the Row Set, the name is assigned when the Row Set Iterator is created. See RowSet.createRowSetIterator(String) for more info.

Specified by:

getName in interface RowSetIterator

Overrides:

getName in class RowSetHelper

getDataControl

protected DCDataControl getDataControl()

rebuildIteratorUpto

public void rebuildIteratorUpto(int index)

Creates a new Iterator over the dataSource (if the datasource itself is not an Iterator) and resets the currency to the given index.

setProviderMethodResultName

public final void setProviderMethodResultName(java.lang.String name)

getProviderMethodResultName

public final java.lang.String getProviderMethodResultName()

setProviderMethodResultUseCount

public final void setProviderMethodResultUseCount(int count)

getProviderMethodResultUseCount

public final int getProviderMethodResultUseCount()

setAccessorName

public final void setAccessorName(java.lang.String accName)

getAccessorName

public final java.lang.String getAccessorName()

syncIterator

protected int syncIterator(int index)

fetchProvider

protected java.lang.Object fetchProvider()

clearCurrentData

public void clearCurrentData()

for internal framework use only. Cleans the current data and rests this iterator. Next call to fetch data will attempt to re-execute the data provider.

closeRowSetIterator

public void closeRowSetIterator()

Description copied from interface: RowSetIterator

Closes this row set iterator. If this row set iterator is a master in a master-detail relationship, closeRowSetIterator closes all detail row sets.

After that, it fires a RowSetManagementListener.iteratorClosed() event to its RowSetManagementListener's.

Then, it deregisters this row set iterator from the owning row set, and deregisters all its listeners.

Specified by:

closeRowSetIterator in interface RowSetIterator

getRowSet

public RowSet getRowSet()

Description copied from interface: RowSetIterator

Gets the Row Set that this Iterator belongs to.

Specified by:

getRowSet in interface RowSetIterator

Returns:

the owning Row Set.

getDataProvider

public java.lang.Object getDataProvider()

getRowSetIterator

public RowSetIterator getRowSetIterator()

next

public Row next()

Description copied from interface: RowIterator

Gets the next row in the iterator. If next() is called on an iterator whose Row Set has not yet been #oracle.jbo.RowSet.executeQuery()'ed, the Row Set's query is executed. Thus, the user does not need to call executeQuery() himself before calling next(). We refer to this as implicit query execution or implicit Row Set execution.

Before moving to the next row, next() validates the current row (if the iterator has a current row) through a call to #oracle.jbo.Row.validate().

If the currency is on the last row of the range and next() is called, the range is scolled down by one row to bring the next row into the visible range. In particular, if the range size is 1, next() scrolls the range down by 1 row.

When this method is called, the current row of the iterator may be outside the range. (Note that the current row does not have to be within the range.) If so, next() will scroll the range, so that the row that will be the current row at the conclusion of this method will be positioned in the middle of the range.

If the iterator is just opened or reset (see RowIterator.reset()), next() will return the first row if one exists. In this situation, next() is functionally equivalent to RowIterator.first().

If the iterator is at the last row of the Row Set, next() push the currency into the imaginary slot after the last row. This will set the current slot status to SLOT_BEYOND_LAST.

When the next row is required, a check is made to see if the row has already been brought into the collection. If not, the row is fetched from database. Note that the View Object's fetch mode affects how rows are fetched from database into the collection. See #oracle.jbo.server.ViewObjectImpl.getFetchMode() for details.

If successful, this method designates the next row as the current row (the currency finally moves).

This method generates events to notify the changes to the iterator. If scrolling occurs because of conditions described above, a #oracle.jbo.ScrollEvent will be sent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent). To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

If the currency is changed, it generates a #oracle.jbo.NavigationEvent and sends it to #oracle.jbo.RowSetListener.navigated(oracle.jbo.NavigationEvent).

Specified by:

next in interface RowIterator

Returns:

the next #oracle.jbo.Row object, or null if there is no next row.

previous

public Row previous()

Description copied from interface: RowIterator

Gets the previous row in the iterator. If previous() is called on an iterator whose Row Set has not yet been #oracle.jbo.RowSet.executeQuery()'ed, the Row Set's query is executed. Thus, the user does not need to call executeQuery() himself before calling previous(). We refer to this as implicit query execution or implicit Row Set execution.

Before moving to the previous row, previous() validates the current row (if the iterator has a current row) through a call to #oracle.jbo.Row.validate().

If the currency is on the first row of the range and previous() is called, the range is scolled up by one row to bring the previous row into the visible range. In particular, if the range size is 1, previous() scrolls the range up by 1 row.

When this method is called, the current row of the iterator may be outside the range. (Note that the current row does not have to be within the range.) If so, previous() will scroll the range, so that the row that will be the current row at the conclusion of this method will be positioned in the middle of the range.

If the iterator is just opened or reset (see RowIterator.reset()), previous() will null as the currency is already on the imaginary slot before the first row.

If the iterator is at the first row of the Row Set, previous() push the currency into the imaginary slot before the first row. This will set the current slot status to SLOT_BEFORE_FIRST.

If successful, this method designates the previous row as the current row (the currency finally moves).

This method generates events to notify the changes to the iterator. If scrolling occurs because of conditions described above, a #oracle.jbo.ScrollEvent will be sent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent). To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

If the currency is changed, it generates a #oracle.jbo.NavigationEvent and sends it to #oracle.jbo.RowSetListener.navigated(oracle.jbo.NavigationEvent).

Specified by:

previous in interface RowIterator

Returns:

the previous #oracle.jbo.Row object, or null if there is no previous row.

first

public Row first()

Description copied from interface: RowIterator

Gets the first row in the iterator. If first() is called on an iterator whose Row Set has not yet been #oracle.jbo.RowSet.executeQuery()'ed, the Row Set's query is executed. Thus, the user does not need to call executeQuery() himself before calling first(). We refer to this as implicit query execution or implicit Row Set execution.

This method checks to see if the currency is not on the first row. If not, it resets the currency to the imaginary slot before the first row and then calls RowIterator.next(). Note that the act of resetting the currency may cause the range to scroll upward.

If the currency is on the slot before the first row, it simply calls next(). In this case, first() is equivalent to next().

If the currency is already on the first row, nothing happens.

If first() is called on an empty Row Set (a Row Set that has no row), the currency is set to the slot after the last row, and null is returned.

This method generates events to notify the changes to the iterator, e.g., #oracle.jbo.ScrollEvent and/or #oracle.jbo.NavigationEvent. See RowIterator.next() for details.

Specified by:

first in interface RowIterator

Returns:

the first #oracle.jbo.Row object, or null if there is no first row. In that case (null return), the current slot status will be RowIterator.SLOT_BEYOND_LAST.

last

public Row last()

Description copied from interface: RowIterator

Gets the last row in the iterator. If last() is called on an iterator whose Row Set has not yet been #oracle.jbo.RowSet.executeQuery()'ed, the Row Set's query is executed. Thus, the user does not need to call executeQuery() himself before calling last(). We refer to this as implicit query execution or implicit Row Set execution.

Before moving to the last row, last() validates the current row (if the iterator has a current row) through a call to #oracle.jbo.Row.validate().

This method retrieves all rows from the Row Set and scrolls (if necessary) to the last row. If some of these rows have not yet been fetched from database, it fetches them. The View Object's fetch mode affects how rows are fetched from database into the collection. See #oracle.jbo.server.ViewObjectImpl.getFetchMode() for details.

If successful, this method designates the last row as the current row.

If last() is called on an empty Row Set, the currency moves to the slot beyond the last row. The current slot status is set to RowIterator.SLOT_BEYOND_LAST.

The caller of this method should be aware that it may take a long time to complete as all rows from the Row Set are fetched.

The number of rows in the range at the completion of this method is affected by the "iteration mode". See Iteration Modes above for details.

This method generates events to notify the changes to the iterator. If scrolling occurs because of conditions described above, a #oracle.jbo.ScrollEvent will be sent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent). To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

If the currency is changed, it generates a #oracle.jbo.NavigationEvent and sends it to #oracle.jbo.RowSetListener.navigated(oracle.jbo.NavigationEvent).

Specified by:

last in interface RowIterator

Returns:

the last #oracle.jbo.Row object, or null if there is no last row.

reset

public void reset()

Description copied from interface: RowIterator

Moves the currency to the slot before the first row.

After this method, the current slot status will be RowIterator.SLOT_BEFORE_FIRST. A subsequent invocation of RowIterator.next() will cause the first row to become the current row.

It sends a #oracle.jbo.ScrollEvent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent) if the currency was not on the first row or on the slot before the first row. To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

Specified by:

reset in interface RowIterator

hasNext

public boolean hasNext()

Description copied from interface: RowIterator

Tests for the existence of a row after the current row.

Specified by:

hasNext in interface RowIterator

Returns:

true if there is a next row. Specifically, if the Row Set is empty or if the currency is on the last row or the slot after the last row (current slot status == RowIterator.SLOT_BEYOND_LAST), it returns false. Otherwise, true.

hasPrevious

public boolean hasPrevious()

Description copied from interface: RowIterator

Tests for the existence of a row before the current row.

If the Row Set is forward-only, it returns false.

Specified by:

hasPrevious in interface RowIterator

Returns:

true if there is a previous row. Specifically, if the Row Set is empty or forward-only or if the currency is on the first row or the slot before the first row (current slot status == RowIterator.SLOT_BEFORE_FIRST), it returns false. Otherwise, true.

isRangeAtBottom

public boolean isRangeAtBottom()

Description copied from interface: RowIterator

Tests if the Row Set Iterator range is at the end of the result set.

Specified by:

isRangeAtBottom in interface RowIterator

Returns:

true if the last row of the range is the last row of the result set.

isRangeAtTop

public boolean isRangeAtTop()

Description copied from interface: RowIterator

Tests if the Row Set Iterator range is at the beginning of the result set.

Specified by:

isRangeAtTop in interface RowIterator

Returns:

true if the first row of the range is the first row of the result set.

getFetchedRowCount

public int getFetchedRowCount()

Description copied from interface: RowIterator

Counts the number of rows fetched from database into the Row Set collection up to this point.

Specified by:

getFetchedRowCount in interface RowIterator

Returns:

the number of rows fetched.

getRowCount

public int getRowCount()

Description copied from interface: RowIterator

Counts the total number of rows in the Row Set.

Note that this method retrieves all rows from the database then returns the number of rows in the Row Set collection.

Specified by:

getRowCount in interface RowIterator

Returns:

the number of rows.

setRangeSize

public int setRangeSize(int size)

Description copied from interface: RowIterator

Modifies the size of the Row Set Iterator range.

This method takes effect when the next set of data is fetched. For an example usage of setRangeSize, see setRangeStart.

Specified by:

setRangeSize in interface RowIterator

Parameters:

size - the new number of rows in the iterator range. Size of 0 is treated same as 1. Size < -1 is treated same as -1.

Returns:

the new size of the range.

See Also:

RowIterator.setRangeStart(int)

getRangeSize

public int getRangeSize()

Description copied from interface: RowIterator

Gets the size of the Row Set Iterator range.

Specified by:

getRangeSize in interface RowIterator

Returns:

the number of rows in the range.

getRowCountInRange

public int getRowCountInRange()

Description copied from interface: RowIterator

Gets the size of the Row Set Iterator range.

Specified by:

getRowCountInRange in interface RowIterator

Returns:

the number of rows in the range.

getRangeStart

public int getRangeStart()

Description copied from interface: RowIterator

Gets the absolute row index of the first row in the Row Set Iterator range.

The absolute index is 0-based, and is the row's index relative to the entire result set.

Specified by:

getRangeStart in interface RowIterator

Returns:

an index.

setRangeStart

public int setRangeStart(int start)

Description copied from interface: RowIterator

Moves the Row Set Iterator range.

Note that the index is 0-based. When you call setRangeStart(1), the range start will be positioned at the second table row.

Another behavior of setRangeStart (and also setRangeSize) is that it tries to position the range, so as to fill up the range as much as possible. For example, assume you have View Object vo focused on a table with four rows (A, B, C, D), and you execute the following code:

     vo.setRangeStart(4);
     vo.setRangeSize(3);
     Row[] rows = vo.getAllRowsInRange();
 

In this case, rows contains the last 3 rows (B, C, D). When you call setRangeStart(4), it will try to position you at row 4. Since the index is 0-based, it finds that there is no row. Since the default range size is 1, it will position you to the last row (row index 3).

Then, when you call getRangeSize(3), it tries to fill up the range from the bottom. This is why you get (B, C, D).

Specified by:

setRangeStart in interface RowIterator

Parameters:

start - the absolute index of the new first row in the Row Set Iterator range.

getEstimatedRangePageCount

public int getEstimatedRangePageCount()

Description copied from interface: RowSetIterator

Returns getEstimatedRowCount()/rangePageSize, if rangeSize > 0. For rangeSize <= 0, returns 1.

This number may fluxuate when the View Object is syncronized with its Entity Object.

Specified by:

getEstimatedRangePageCount in interface RowSetIterator

Returns:

the number of range-pages that this RowSet collection has.

scrollToRangePage

public int scrollToRangePage(int pageIndex)

Description copied from interface: RowSetIterator

Moves the row set range start to the given page index where every page consists of RangeSize number of rows. PageIndex should start at page number 1. This method calculates the rowIndex that should start at that page and then scrolls the iterator to start at that row by using the following calculation:

(rangeSize * (pageSize-1)) - getRangeStart();

Specified by:

scrollToRangePage in interface RowSetIterator

Parameters:

pageIndex - the page number to go to in the result set.

Returns:

the number of rows actually scrolled.

scrollRange

public int scrollRange(int amount)

Description copied from interface: RowIterator

Moves the Row Set Iterator range up or down a given number of rows.

Specified by:

scrollRange in interface RowIterator

Parameters:

amount - the number of rows to scroll. A negative value scrolls upward.

Returns:

the number of rows actually scrolled.

scrollRangeTo

public int scrollRangeTo(Row row,
                         int index)

Description copied from interface: RowIterator

Scrolls the range to place a given row at a given range index.

Specified by:

scrollRangeTo in interface RowIterator

Parameters:

row - the row.

index - the range index at which the row is to be found.

Returns:

the actual number of rows scrolled. A negative number indicates that the scroll was scrolled upward.

getRow

public Row getRow(Key key)

Description copied from interface: RowIterator

Locates and returns a row by its unique key.

If the key being passed in has the row handle, it uses the row handle to locate the row. This is a quick operation. (A key returned from a call to Row.getKey() contains the row handle.)

If the key does not have a row handle, or if the handle look up did not find the row in the View row cache, it performs a linear search through the Row Set collection looking for a match. Hence, this method could take quite a long time to complete.

This method is similar to RowIterator.findByKey(Key, int) in that both methods return Row(s) that match the given key. However, the user should understand the differences. First, findByKey() performs random search. getKey() only performs random search if the key has the row handle portion and if the row with that handle is currently in the Row Set collection. Otherwise, getKey() does a linear search. Hence, findByKey() is generally faster.

However, findByKey() may find the matching Row(s) out of sequence. When a row is not found in the View row cache, findByKey() issues a database query. Matching rows are retrieved and appended to the Row Set collection. For example, suppose the Row Set collection has 200 rows that qualify in the database. Suppose the user retrieved only 10 rows (190 not yet retrieved). Suppose, at this time, the user issues findByKey() that locates the 200-th row (the last row in database result set). That row is appended to the Row Set collection at the 11-th spot. Thus, when you use findByKey(), you may see rows out of sequence. In contrast, getRow() always retrieves rows in sequence.

If the Row Set collection is of any non-trivial size (say over 50), we would recommend findByKey().

findByKey() allows for partial key (only for View Objects that have multiple Entity bases). When a partial key is specified, multiple rows may return. getKey() returns one and only one row (exact match).

Specified by:

getRow in interface RowIterator

Parameters:

key - the key.

Returns:

the Row object matching the key.

getStructureDef

public StructureDef getStructureDef()

getRowAtRangeIndex

public Row getRowAtRangeIndex(int rangeIndex)

Description copied from interface: RowIterator

Accesses a row through its range index.

Specified by:

getRowAtRangeIndex in interface RowIterator

Parameters:

rangeIndex - an index in the range: 0 to getRangeSize() - 1.

Returns:

a Row object, or null if the index is out of range.

getCurrentRow

public Row getCurrentRow()

Description copied from interface: RowIterator

Accesses the current row.

Specified by:

getCurrentRow in interface RowIterator

Returns:

the Row object designated as the current row.

getCurrentRowIndex

public int getCurrentRowIndex()

Description copied from interface: RowIterator

Gets the absolute index (not range index) of the current row.

Specified by:

getCurrentRowIndex in interface RowIterator

Returns:

a row index.

getCurrentRowSlot

public int getCurrentRowSlot()

Description copied from interface: RowIterator

Gets the slot status of the current row.

Specified by:

getCurrentRowSlot in interface RowIterator

Returns:

one of the class constants prefixed by SLOT_.

getIterMode

public int getIterMode()

Description copied from interface: RowIterator

Gets the current iteration mode. See Iteration Modes above for details on iteration mode which controls how the range behaves when it reaches the end of the Row Set.

Specified by:

getIterMode in interface RowIterator

Returns:

ITER_MODE_LAST_PAGE_PARTIAL if the iteration mode is "partial-last-page", ITER_MODE_LAST_PAGE_FULL if it is "full-last-page".

setIterMode

public void setIterMode(int mode)

Description copied from interface: RowIterator

Sets the iteration mode for this Row Iterator. See Iteration Modes above for details on iteration mode which controls how the range behaves when it reaches the end of the Row Set.

Specified by:

setIterMode in interface RowIterator

Parameters:

mode - should be ITER_MODE_LAST_PAGE_PARTIAL if the iteration mode is to be "partial-last-page", ITER_MODE_LAST_PAGE_FULL if it is to be "full-last-page".

setRowValidation

public void setRowValidation(boolean flag)

Description copied from interface: RowIterator

Sets the validation flag on this iterator. By default a RowIterator validates the current row when navigating to another row. This method can be used to turn this row-validation off by passing 'false' as parameter.

Specified by:

setRowValidation in interface RowIterator

Parameters:

flag - Whether to turn row validation off or not.

isRowValidation

public boolean isRowValidation()

Description copied from interface: RowIterator

Gets the validation flag on this iterator. By default a RowIterator validates the current row when navigating to another row. This method returns TRUE if this row-validation is turned off.

Specified by:

isRowValidation in interface RowIterator

containsRow

protected boolean containsRow(Row row)

setCurrentRow

public boolean setCurrentRow(Row row)

Description copied from interface: RowIterator

Designates a given row as the current row.

Specified by:

setCurrentRow in interface RowIterator

Parameters:

row - the new current row.

Returns:

true if the operation succeeded.

setCurrentRowAtRangeIndex

public boolean setCurrentRowAtRangeIndex(int rangeIndex)

Description copied from interface: RowIterator

Designates a given index as the current row.

Specified by:

setCurrentRowAtRangeIndex in interface RowIterator

Parameters:

rangeIndex - the index of the new current row.

Returns:

true if the operation succeeded.

createRow

public Row createRow()

Description copied from interface: RowIterator

Creates a new Row object, but does not insert it into the Row Set.

Specified by:

createRow in interface RowIterator

Returns:

a new Row object.

createAndInitRow

public Row createAndInitRow(AttributeList nvp)

Description copied from interface: RowIterator

Creates and initializes a new Row object, but does not insert it into the Row Set. This method differs from createRow() mainly in that this method allows the user to pass in a list of name-value pairs with which row attributes are initialized.

nvp is a named value pair. When building an nvp from scratch, use NameValuePairs to build a new nvp. Here is an example:

    NameValuePairs nvp = new NameValuePairs();
    nvp.setAttribute("EmpTyp", "C");

    Row row = voEmp.createAndInitRow(nvp);
 

This method is particularly useful when creating a subclass View Row or Entity Row. You can include polymorphic discriminator attribute values in nvp and correct subclass row object will be created.

When this method is called, underlying entities are created. After the new entities are created, a new view row is created. After that ViewRowImpl.create(oracle.jbo.AttributeList) is called with this nvp. ViewRowImpl.create(AttributeList) walks thru the list of entities and calls EntityImpl.create(AttributeList) with the same nvp for each entity in the view row.

Specified by:

createAndInitRow in interface RowIterator

Parameters:

nvp - a list of name-value pairs.

Returns:

a new Row object.

insertRow

public void insertRow(Row row)

Description copied from interface: RowIterator

Inserts a row to the Row Set, before the current row. This method sets the current row to the row just inserted. With respect to eventing, this method call will generate two events (of oracle.jbo.RowSetListener): rowInserted, followed by navigated.

Specified by:

insertRow in interface RowIterator

Parameters:

row - the Row object to be added.

insertRowAtRangeIndex

public void insertRowAtRangeIndex(int rangeIndex,
                                  Row row)

Description copied from interface: RowIterator

Inserts a row to the Row Set at the given range index. The index is relative to the range, i.e., index of 0 would mean to insert before the first row of the range. Allowed values for index is 0 to range size. If index equals range size, the row is inserted right after the last row in the range. This method call does not alter the current position of the iterator, nor does it affect the range position.

Specified by:

insertRowAtRangeIndex in interface RowIterator

Parameters:

rangeIndex - the point where row is to be added.

row - the Row object to be added.

removeCurrentRow

public void removeCurrentRow()

Description copied from interface: RowIterator

Removes the current Row object from the Row Set.

Specified by:

removeCurrentRow in interface RowIterator

removeCurrentRowFromCollection

public void removeCurrentRowFromCollection()

Description copied from interface: RowIterator

Removes the current Row object from the collection.

It does not cause the row to be deleted from the database table. It just removes the row from the row collection. However, once the row is removed, it cannot be used any more. If you want to remove the current row from collection and insert it elsewhere, call #removeAndRetain(), change currency to the desired location, and then call RowIterator.insertRow(oracle.jbo.Row) with that row.

Specified by:

removeCurrentRowFromCollection in interface RowIterator

removeCurrentRowAndRetain

public Row removeCurrentRowAndRetain()

Description copied from interface: RowIterator

Removes the current Row object from the collection and retain it for insertion into another location.

It does not cause the row to be deleted from the database table. It just removes the row from the row collection.

This method differs from RowIterator.removeCurrentRowFromCollection() in that after the current row is removed from the collection, it can be inserted back into the collection at another location.

To do so, call RowIterator.removeCurrentRowAndRetain(), and get the returning row. Then, change currency to the desired location, and call RowIterator.insertRow(oracle.jbo.Row) with that row.

Specified by:

removeCurrentRowAndRetain in interface RowIterator

Returns:

the current row which was just removed from collection.

getRangeIndexOf

public int getRangeIndexOf(Row row)

Description copied from interface: RowIterator

Get the index of the given row relative to the beginning of the range.

Specified by:

getRangeIndexOf in interface RowIterator

Parameters:

row - a Row object. or -1 if the row is not in range.

Returns:

the index of row,

enumerateRowsInRange

public java.util.Enumeration enumerateRowsInRange()

Description copied from interface: RowIterator

Gets an Enumeration of all rows in the Row Set.

Specified by:

enumerateRowsInRange in interface RowIterator

Returns:

an Enumeration interface.

getFilteredRows

public Row[] getFilteredRows(java.lang.String attrName,
                             java.lang.Object attrValue)

Description copied from interface: RowSetIterator

Returns all rows in this collection whose attribute value matches the value being passed in attrValue.

Note that this method does not affect the current RowSetIterator.

Specified by:

getFilteredRows in interface RowSetIterator

Parameters:

attrName - name of the attribute to be used for filtering.

attrValue - attribute value for filtering.

Returns:

an array of rows that match.

getFilteredRowsInRange

public Row[] getFilteredRowsInRange(java.lang.String attrName,
                                    java.lang.Object attrValue)

Description copied from interface: RowSetIterator

Returns all rows in this range whose attribute value matches the value being passed in attrValue.

This method uses getAllRowsInRange() to retrieve all rows and then match the rows.

Specified by:

getFilteredRowsInRange in interface RowSetIterator

Parameters:

attrName - name of the attribute to be used for filtering.

attrValue - attribute value for filtering.

Returns:

an array of rows in the current range that match.

getAllRowsInRange

public Row[] getAllRowsInRange()

Description copied from interface: RowIterator

Extracts the rows in the range.

Specified by:

getAllRowsInRange in interface RowIterator

Returns:

an array of Row objects. The size if the array is setViewSize().

useListAdapter

protected boolean useListAdapter()

Let a subclass decide if the ListAdapter should be used to avoid creating an iterator over the original list. This will allow bean subclasses that only use java.util.List to override and get a synchronized list behavior where they do not have to notify the bindings of list mutations. In this case the datacontrol will also have to consider issue with default Action binding behavior of insert and remove rows (if they enable it via the datacontrol).

getNextRangeSet

public Row[] getNextRangeSet()

Description copied from interface: RowSetIterator

Gets the next set of rows in the range. This method is good for processing rows in a range-ful fashion. Suppose the Row Set has 20 rows and the Iterator range size is 10. Suppose further that the Iterator is showing rows 0 through 9 (0-based indexing). Calling getNextRangeSet() will return rows 10 through 19.

If the next range set does not have enough rows to fill up the range, getNextRangeSet() returns a partially filled range. That is, this method operates as if the iteration mode is RowIterator.ITER_MODE_LAST_PAGE_PARTIAL.

If there is no more rows, this method returns an empty array (an array of length 0).

While obtaining the next range set, the range will be scrolled. This causes a #oracle.jbo.ScrollEvent to be sent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent). To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

After the next range set is obtained, the method sets the first Row of the range as the current row. This may fire a #oracle.jbo.NavigationEvent and sends it to #oracle.jbo.RowSetListener.navigated(oracle.jbo.NavigationEvent).

Specified by:

getNextRangeSet in interface RowSetIterator

Returns:

an array of Rows in the next range set. An array of length 0 if there are no more rows.

getPreviousRangeSet

public Row[] getPreviousRangeSet()

Description copied from interface: RowSetIterator

Gets the previous set of rows in the range. This method is good for processing rows in a range-ful fashion. Suppose the Row Set has 20 rows and the Iterator range size is 10. Suppose further that the Iterator is showing rows 10 through 19 (0-based indexing). Calling getPreviousRangeSet() will return rows 0 through 9.

If there is no more rows, this method returns an empty array (an array of length 0).

While obtaining the previous range set, the range will be scrolled. This causes a #oracle.jbo.ScrollEvent to be sent to #oracle.jbo.RowSetListener.rangeScrolled(oracle.jbo.ScrollEvent). To pick up such an event, the listener object must implement the #oracle.jbo.RowSetListener interface. Further, this listener must be registered through a call to #oracle.jbo.NavigatableRowIterator.addListener(Object) (the listener object passed in as the parameter to addListener).

After the previous range set is obtained, the method sets the first Row of the range as the current row. This may fire a #oracle.jbo.NavigationEvent and sends it to #oracle.jbo.RowSetListener.navigated(oracle.jbo.NavigationEvent).

Specified by:

getPreviousRangeSet in interface RowSetIterator

Returns:

an array of Rows in the previous range set. An array of length 0 if there are no more rows.

getDetailRowSets

public RowSet[] getDetailRowSets()

Get all detail row sets.

Specified by:

getDetailRowSets in interface RowSetIterator

Returns:

An array of detail RowSet objects.

createDetailRowSet

public RowSet createDetailRowSet(java.lang.String rsName,
                                 java.lang.String linkDefName)

Create a row set for the view link.

Specified by:

createDetailRowSet in interface RowSetIterator

Parameters:

rsName - the name of the new detail Row Set.

linkDefName - the name of a View Link definition. This View Link chooses the relationship in which this Iterator is the master and the new Row Set is the detail. It must be a fully qualified name (including the package name).

Returns:

the detail RowSet object.

notifyRangeRefreshed

public final void notifyRangeRefreshed(int rangeStart)

notifyNavigationEvent

protected void notifyNavigationEvent(Row srcRow,
                                     Row dstRow)

createKey

public Key createKey(java.lang.String stringifiedKey)

createKey

public Key createKey(AttributeList nvp)

Description copied from interface: RowIterator

Given a list of name-value pairs, creates a Key object that matches the key structure for the ViewObject for this RowItertor. This Key object could be used as a valid argument to findByKey. This Key will have null values for attributes expected in the key structure for this ViewObject, but not found in the given set of name-value pairs.

Specified by:

createKey in interface RowIterator

findByKey

public Row[] findByKey(Key key,
                       int maxNumOfRows)

Description copied from interface: RowIterator

Finds and returns View rows that match the specified key.

If this View Object has multiple Entity Object bases, the key need not be specified for all. However, if a key is specified for n-th Entity Object, and if this Entity Object's primary key consists of multiple parts, all parts of the key must be specified.

If not all Entity keys are included, multiple rows may match the partial key. The maxNumOfRows parameter is used to specify the maximum number of rows to return.

For example, suppose the View Object has Emp and DeptLocation as its Entity Object bases. Suppose further that Emp has a one part primary key (employee number) and DeptLocation has a two part primary key (dept name and location).

The user can make the following call to look for all employees working in ACCOUNTING's NEW YORK office:

    // The key will consist of 3 parts.  The first part is
    // for the employee number (which is null, meaning not
    // specified).  The second part is the department name.
    // The third is the location.
    Object [] keyValues = new Object[3];

    keyValues[0] = null;  // All employees
    keyValues[1] = "ACCOUNTING";
    keyValues[4] = "NEW YORK"; // third Entity Object, key part 1

    Row[] rows = myAM.findViewObject(new Key(keyValues), -1);
 

In this example, if you were to include the key for DeptLocation, you must specify both key parts.

Note that the position of the key must patch the order of the Entity Object bases and their keys. In the above example, keyValues[0] is always the employee number. You cannot specify the employee number in keyValues[1] or keyValues[2].

This method works even on a View Object which has no Entity Object base. For this to work, however, the ViewObject's key attribute list must have been set up through a call to #oracle.jbo.server.ViewObjectImpl.setKeyAttributeDefs(int[]). For example, suppose we have a View Object with 5 attributes where attribute 0 and 2 are to be its key attributes.

Then, the following code block will retrieve all rows whose attribute 0 is "PERM" and attribute 2 is 30.

    // First set up the key attributes
    myVO.setKeyAttributeDefs(new int[] { 0, 2 });

    // The key will consist of 2 parts.  The first part is
    // for attribtue 0 and the second is for attribute 2.
    Object [] keyValues = new Object[2];

    keyValues[0] = "PERM";
    keyValues[1] = new Integer(30);

    Row[] rows = myAM.findViewObject(new Key(keyValues), -1);
 

Internally, findByKey() works as follows for a View Object with Entity Object bases: It takes the first non-null entity key from key. It uses it to find the Entity row in the cache. If it finds it, then it looks at all View rows in the Row Set collection that uses that Entity row and apply the remaining keys to qualify them. It may or may not find as many rows as requested.

If the requested number of rows have been found, the array returns. Otherwise, a check is made to see if the View Object's fetch size is unlimited (which is -1, see #ViewObject.setMaxFetchSize()) and the Row Set has fetched all the rows out of database into its collection. If this is the case, we return the array even if the requested number of rows have not been found. This is because these conditions imply that all rows have been brought into Row Set collection and no further search is necessary.

Otherwise (the requested number of rows not yet found and the Row Set has not yet fetched all rows or the fetch size is not -1), the search continues. We now use the key build a where-clause for an internal View Object. That where-clause is applied and qualifying rows are retrieved from it to find the requested number of rows.

For a View Object which has no Entity Object base, we simply skip the step of looking in the Entity Object cache. Other than that, the logic is applied.

As new rows are retrieved from database they are added to the Row Set collection. Thus, the user can work with these rows immediately, e.g., call RowIterator.setCurrentRow(Row) with one of them. Care is applied to make sure the same row is not added to the Row Set collection multiple times.

This method does not fire any navigation event, nor does it move the range or the current row. Also, as rows are added to the Row Set collection, no insertion event fires (as this is analogous to fetching rows).

See RowIterator.getRow(Key) for comparison between this method and getRow(Key).

Specified by:

findByKey in interface RowIterator

Parameters:

key - the key to match.

maxNumOfRows - the maximum size of the array to return, or -1 to return all rows.

Returns:

an array of rows matching the key.

findByEntity

public Row[] findByEntity(int eRowHandle,
                          int maxNumOfRows)

Description copied from interface: RowIterator

Finds and returns View rows that use the Entity row, identified by the Entity row handle, eRowHandle.

Specified by:

findByEntity in interface RowIterator

Parameters:

eRowHandle - the Entity row handle.

maxNumOfRows - the maximum size of the row array to return, or -1 to return all rows.

Returns:

an array of View rows that use the Entity row.

getProperties

public java.util.Hashtable getProperties()

Description copied from interface: Properties

Gets the table of properties.

Specified by:

getProperties in interface Properties

Specified by:

getProperties in class PropertiesHelper

isNameGenerated

public boolean isNameGenerated()

Description copied from interface: RowSetIterator

Tests if the Iterator's name was generated by the system.

Specified by:

isNameGenerated in interface RowSetIterator

Returns:

true if the name was generated by the system. false if the name was given by the user and not generated by the system.

getListenersList

protected com.sun.java.util.collections.ArrayList getListenersList()

Overrides:

getListenersList in class RowSetHelper

internalCreateRowInstanceFor

protected Row internalCreateRowInstanceFor(java.lang.Object rowData)