org.apache.openjpa.jdbc.kernel.exps
Class ContainsExpression

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.CompareEqualExpression
      org.apache.openjpa.jdbc.kernel.exps.EqualExpression
          org.apache.openjpa.jdbc.kernel.exps.ContainsExpression

All Implemented Interfaces:

Serializable, Exp, Expression

Direct Known Subclasses:

ContainsKeyExpression

 class ContainsExpression
extends EqualExpression

Tests whether one value contains another.

Author:

Abe White

Constructor Summary

ContainsExpression(Val val1, Val val2)
Constructor.

Method Summary

ExpState	initialize(Select sel, ExpContext ctx, Map contains) Initialize the expression.
protected boolean	isDirectComparison() Subclasses can override this method if, when they compare to another, value, the comparison is indirect.

Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.EqualExpression

appendTo

Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.CompareEqualExpression

acceptVisit, appendTo, getValue1, getValue2, selectColumns

Methods inherited from class java.lang.Object

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

Constructor Detail

ContainsExpression

public ContainsExpression(Val val1,
                          Val val2)

Constructor. Supply values to test.

Method Detail

initialize

public ExpState initialize(Select sel,
                           ExpContext ctx,
                           Map contains)

Description copied from interface: Exp

Initialize the expression. This method should recursively initialize any sub-expressions or values.

Specified by:

initialize in interface Exp

Overrides:

initialize in class CompareEqualExpression

contains - 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

isDirectComparison

protected boolean isDirectComparison()

Description copied from class: CompareEqualExpression

Subclasses can override this method if, when they compare to another, value, the comparison is indirect. For example, field.contains (x) should compare element values to null, not the field itself.

Overrides:

isDirectComparison in class CompareEqualExpression