kodo.jdbc.query
Class SQLPath

java.lang.Object
  |
  +--kodo.jdbc.query.SQLPath

All Implemented Interfaces:

kodo.jdbc.query.JDBCPath, JDBCValue, Path, Value

public class SQLPath

extends Object

implements kodo.jdbc.query.JDBCPath

A path represents a traversal into fields of a candidate object.

Constructor Summary

SQLPath(ClassMapping type)
Return a path starting with the 'this' ptr.

SQLPath(ClassMapping candidate, kodo.jdbc.query.Variable var)
Return a path starting from the given variable.

Method Summary

void	appendIsEmpty(SQLBuffer sql) Append the SQL testing whether this value is empty to the given buffer.
void	appendIsNotNull(SQLBuffer sql) Append the SQL testing whether this value is not null to the given buffer.
void	appendIsNull(SQLBuffer sql) Append the SQL testing whether this value is null to the given buffer.
void	appendTo(SQLBuffer sql, int index) Append the SQL for this value to the given buffer.
void	calculateValue(KodoPersistenceManager pm, Map params, JDBCValue other) Calculate and cache the SQL for this value.
void	castTo(Class type) Cast this value to the given type.
void	get(FieldMetaData field)
ClassMapping	getClassMapping() Return the class mapping for this path.
Object	getDataStoreValue(Object val, KodoPersistenceManager pm) Transform the given value into its datastore equivalent.
FieldMapping	getFieldMapping() Return the field mapping for this path.
Joins	getJoins() Return the joins for this value.
void	getKey()
ClassMetaData	getMetaData()
String	getPath() Return the string of fields this path traverses.
void	initialize(KodoPersistenceManager pm, Select select, boolean nullTest) Initialize the value.
boolean	isUnaccessedVariable() Return true if this is a bound variable that has not been accessed after binding.
boolean	isVariable()
int	length() Return the number of SQL elements in this value.
Object	load(Result res, JDBCStoreManager store, JDBCFetchConfiguration fetch) Load the data for this value.
void	select(Select sel, JDBCStoreManager store, JDBCFetchConfiguration fetch) Select the data for this value.
void	setContainsId(String id) If this path is part of a contains clause, then alias it to the proper contains id before initialization.
void	setMetaData(ClassMetaData meta)

Methods inherited from class java.lang.Object

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

Constructor Detail

SQLPath

public SQLPath(ClassMapping type)

Return a path starting with the 'this' ptr.

SQLPath

public SQLPath(ClassMapping candidate,
               kodo.jdbc.query.Variable var)

Return a path starting from the given variable.

Method Detail

getMetaData

public ClassMetaData getMetaData()

Specified by:

getMetaData in interface Value

setMetaData

public void setMetaData(ClassMetaData meta)

Specified by:

setMetaData in interface Value

isVariable

public boolean isVariable()

Specified by:

isVariable in interface Value

getClassMapping

public ClassMapping getClassMapping()

Return the class mapping for this path.

getFieldMapping

public FieldMapping getFieldMapping()

Return the field mapping for this path.

getPath

public String getPath()

Return the string of fields this path traverses.

isUnaccessedVariable

public boolean isUnaccessedVariable()

Return true if this is a bound variable that has not been accessed after binding. Useful for filters like "coll.contains (var) && var == null", which should really just act like "coll.contains (null)".

setContainsId

public void setContainsId(String id)

If this path is part of a contains clause, then alias it to the proper contains id before initialization.

get

public void get(FieldMetaData field)

Specified by:

get in interface Path

getKey

public void getKey()

Specified by:

getKey in interface kodo.jdbc.query.JDBCPath

castTo

public void castTo(Class type)

Description copied from interface: JDBCValue

Cast this value to the given type.

Specified by:

castTo in interface JDBCValue

initialize

public void initialize(KodoPersistenceManager pm,
                       Select select,
                       boolean nullTest)

Description copied from interface: JDBCValue

Initialize the value. This method should recursively initialize any sub-values. It should also cache the Joins instance containing the joins for this value.

Specified by:

initialize in interface JDBCValue

Following copied from interface: kodo.jdbc.query.JDBCValue

Parameters:

pm - the persistence manager for the query

select - used to create Joins instances

nullTest - if true, then this value will be compared to null or tested for emptiness

calculateValue

public void calculateValue(KodoPersistenceManager pm,
                           Map params,
                           JDBCValue other)

Description copied from interface: JDBCValue

Calculate and cache the SQL for this value.

Specified by:

calculateValue in interface JDBCValue

length

public int length()

Description copied from interface: JDBCValue

Return the number of SQL elements in this value.

Specified by:

length in interface JDBCValue

appendTo

public void appendTo(SQLBuffer sql,
                     int index)

Description copied from interface: JDBCValue

Append the SQL for this value to the given buffer.

Specified by:

appendTo in interface JDBCValue

appendIsEmpty

public void appendIsEmpty(SQLBuffer sql)

Description copied from interface: JDBCValue

Append the SQL testing whether this value is empty to the given buffer.

Specified by:

appendIsEmpty in interface JDBCValue

appendIsNull

public void appendIsNull(SQLBuffer sql)

Description copied from interface: JDBCValue

Append the SQL testing whether this value is null to the given buffer.

Specified by:

appendIsNull in interface JDBCValue

appendIsNotNull

public void appendIsNotNull(SQLBuffer sql)

Description copied from interface: JDBCValue

Append the SQL testing whether this value is not null to the given buffer.

Specified by:

appendIsNotNull in interface JDBCValue

getJoins

public Joins getJoins()

Description copied from interface: JDBCValue

Return the joins for this value. These joins should be created and cached during the JDBCValue.initialize(kodo.runtime.KodoPersistenceManager, kodo.jdbc.sql.Select, boolean) method. The parent expression might modify these joins during its own initialization so that common joins are moved up the expression tree. These joins should not be included in the SQL appended through any of the append methods.

Specified by:

getJoins in interface JDBCValue

getDataStoreValue

public Object getDataStoreValue(Object val,
                                KodoPersistenceManager pm)

Description copied from interface: JDBCValue

Transform the given value into its datastore equivalent.

Specified by:

getDataStoreValue in interface JDBCValue

select

public void select(Select sel,
                   JDBCStoreManager store,
                   JDBCFetchConfiguration fetch)

Description copied from interface: JDBCValue

Select the data for this value.

Specified by:

select in interface JDBCValue

load

public Object load(Result res,
                   JDBCStoreManager store,
                   JDBCFetchConfiguration fetch)
            throws SQLException

Description copied from interface: JDBCValue

Load the data for this value.

Specified by:

load in interface JDBCValue