com.bea.p13n.expression.operator.collection
Class CollectionContains

java.lang.Object
  com.bea.p13n.expression.internal.ComplexExpressionImpl
      com.bea.p13n.expression.operator.Operator
          com.bea.p13n.expression.operator.collection.CollectionOperator
              com.bea.p13n.expression.operator.collection.CollectionContains

All Implemented Interfaces

Expression, com.bea.p13n.expression.ExpressionEvents, BinaryOperator, Serializable, Cloneable

public final class CollectionContains
extends CollectionOperator

Implementation of the CollectionContains operator. Returns true if a Collection contains a given item.
Input 1: A Collection object (or expression that evaluates to a Collection) that defines the Collection to be searched.
Input 2: An Object (or expression that evaluates to an Object) to be found. The semantics of how the search is carried out is defined by the Collection's underlying implementation of the contains method..
Returns: Boolean. Boolean.TRUE if the Collection.contains evaluates to true.

See Also

Serialized Form

Field Summary

Fields inherited from interface com.bea.p13n.expression.operator.BinaryOperator

LHS_INDEX, RHS_INDEX

Fields inherited from interface com.bea.p13n.expression.ExpressionEvents

EVENT_ADD_SUBEXPRESSION, EVENT_CLEAR_CACHE, EVENT_INTERNAL_MAX, EVENT_REMOVE_SUBEXPRESSION, EVENT_SET_CACHE_ENABLED, EVENT_SET_CACHED_VALUE, EVENT_SET_PARENT, EVENT_SET_SOURCE, EVENT_SET_SUBEXPRESSION, EVENT_SET_USER_DATA

Constructor Summary

CollectionContains()

CollectionContains(Object collection, Object item)
Allocates a CollectionContains by associating the given operands.

Method Summary

Class[]

getParameterSignature() Returns the parameter signature for this Expression.

Methods inherited from class com.bea.p13n.expression.operator.collection.CollectionOperator

getLeftHandSide, getRightHandSide

Methods inherited from class com.bea.p13n.expression.operator.Operator

leftHandSide, operand, rightHandSide

Methods inherited from class com.bea.p13n.expression.internal.ComplexExpressionImpl

addListener, addSubExpression, clearCache, clone, createProxyExpression, equals, getCachedValue, getParent, getSource, getSubExpression, getSubExpressionCount, getUserData, hashCode, isCached, isCacheEnabled, isEqualitySubExpression, notifyListeners, removeAllSubExpressions, removeListener, removeSubExpression, removeSubExpression, setCachedValue, setCacheEnabled, setParent, setSource, setSubExpression, setUserData, toString, write

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CollectionContains

public CollectionContains()

CollectionContains

public CollectionContains(Object collection,
                          Object item)

Allocates a CollectionContains by associating the given operands.

Parameters

collection - The Collection object to operate on.

item - An Object that is acting as a second operand.

Method Detail

getParameterSignature

public Class[] getParameterSignature()

Description copied from interface: Expression

Returns the parameter signature for this Expression. Because the sub-expressions within the Expression are typically arguments or operands, some type validation is performed by examining the class types of the sub-expressions against the Expression's parameter signature.
The tests that are performed are:
1. The number of sub-expressions must equals the number of parameter entries.
2. The class type of any sub-expression (or the result of evaluating the sub-expresssion) must equal the class type of the corresponding parameter entry.
3. Any null parameter entries are ignored and are considered optional sub-expressions.

Returns

the Class array containing the parameter signature.