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## 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:
  BinaryOperator, Cloneable, Expression, ExpressionEvents, Serializable

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.

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Copyright © 2003 BEA Systems, Inc. All Rights Reserved