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

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

All Implemented Interfaces:

Expression, JDBCExpression

public class IsEmptyExpression

extends java.lang.Object

implements JDBCExpression

Tests whether the given value is empty.

Constructor Summary

IsEmptyExpression(com.solarmetric.rd.kodo.impl.jdbc.query.exp.JDBCValue val)
Constructor.

Method Summary

void	appendOrdering(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer[] orders, boolean[] ascending, int idx, com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm, java.util.Map params) Append the ordering for this expression to the given buffer.
void	appendTo(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer buf, com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm, java.util.Map params) Append the SQL for this expression to the given buffer.
com.solarmetric.rd.kodo.impl.jdbc.runtime.Joins	getJoins() Return the joins for this expression.
void	initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm, com.solarmetric.rd.kodo.impl.jdbc.runtime.Select select, java.util.Map containsCounts) Initialize the expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

IsEmptyExpression

public IsEmptyExpression(com.solarmetric.rd.kodo.impl.jdbc.query.exp.JDBCValue val)

Constructor. Supply value to test.

Method Detail

initialize

public void initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm,
                       com.solarmetric.rd.kodo.impl.jdbc.runtime.Select select,
                       java.util.Map containsCounts)

Description copied from interface: JDBCExpression

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

Specified by:

initialize in interface JDBCExpression

Parameters:

pm - the persistence manager for this query

select - manage joins made in each query clause

containsCounts - map of relation paths to the number of times the paths appear in a contains() expression; used to ensure paths used for contains() within the same AND expression used different aliases

appendTo

public void appendTo(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer buf,
                     com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm,
                     java.util.Map params)

Description copied from interface: JDBCExpression

Append the SQL for this expression to the given buffer. The SQL should optinally include any joins this expression needs.

Specified by:

appendTo in interface JDBCExpression

appendOrdering

public void appendOrdering(com.solarmetric.rd.kodo.impl.jdbc.schema.SQLBuffer[] orders,
                           boolean[] ascending,
                           int idx,
                           com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl pm,
                           java.util.Map params)

Description copied from interface: JDBCExpression

Append the ordering for this expression to the given buffer.

Specified by:

appendOrdering in interface JDBCExpression

getJoins

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

Description copied from interface: JDBCExpression

Return the joins for this expression. These joins should be created and cached during the JDBCExpression.initialize(com.solarmetric.rd.kodo.runtime.PersistenceManagerImpl, com.solarmetric.rd.kodo.impl.jdbc.runtime.Select, java.util.Map) method. The parent expression might modify these joins during its own initialization so that common joins are moved up the expression tree.

Specified by:

getJoins in interface JDBCExpression