com.solarmetric.rd.kodo.impl.jdbc.query.exp
Class Constant

java.lang.Object
  |
  +--com.solarmetric.rd.kodo.impl.jdbc.query.exp.Constant

All Implemented Interfaces:

JDBCValue, Value

Direct Known Subclasses:

ConstantPath, Literal, Null, Parameter

public abstract class Constant

extends java.lang.Object

implements JDBCValue

A literal or parameter in the JDOQL filter.

Constructor Summary

Constant()

Method Summary

void	appendIsEmpty(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer sql) Append the SQL testing whether this value is empty to the given buffer.
void	appendIsNotNull(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer sql) Append the SQL testing whether this value is not null to the given buffer.
void	appendIsNull(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer sql) Append the SQL testing whether this value is null to the given buffer.
void	castTo(java.lang.Class cls) Cast this value to the given class.
java.lang.Object	getDataStoreValue(java.lang.Object val) Transform the given value into its datastore equivalent.
com.solarmetric.rd.kodo.impl.jdbc.runtime.Joins	getJoins() Return the joins for this value.
java.lang.Object	getSQLValue() Return the SQL value of this constant.
abstract java.lang.Object	getValue() Return the value of this constant.
void	initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm, com.solarmetric.rd.kodo.impl.jdbc.runtime.Select select, boolean nullTest) Initialize the value.
boolean	isVariable() Return true if this value is a variable.
int	length() Return the number of SQL elements in this value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.solarmetric.rd.kodo.impl.jdbc.query.exp.JDBCValue

appendTo, calculateValue

Constructor Detail

Constant

public Constant()

Method Detail

isVariable

public boolean isVariable()

Description copied from interface: Value

Return true if this value is a variable.

Specified by:

isVariable in interface Value

getValue

public abstract java.lang.Object getValue()

Return the value of this constant.

getSQLValue

public java.lang.Object getSQLValue()

Return the SQL value of this constant. Delegates to getValue() by default.

initialize

public void initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm,
                       com.solarmetric.rd.kodo.impl.jdbc.runtime.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

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

castTo

public void castTo(java.lang.Class cls)

Description copied from interface: JDBCValue

Cast this value to the given class.

Specified by:

castTo 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

appendIsEmpty

public void appendIsEmpty(com.solarmetric.rd.kodo.impl.jdbc.schema.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(com.solarmetric.rd.kodo.impl.jdbc.schema.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(com.solarmetric.rd.kodo.impl.jdbc.schema.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 com.solarmetric.rd.kodo.impl.jdbc.runtime.Joins getJoins()

Description copied from interface: JDBCValue

Return the joins for this value. These joins should be created and cached during the JDBCValue.initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl, com.solarmetric.rd.kodo.impl.jdbc.runtime.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 java.lang.Object getDataStoreValue(java.lang.Object val)

Description copied from interface: JDBCValue

Transform the given value into its datastore equivalent.

Specified by:

getDataStoreValue in interface JDBCValue