com.bea.p13n.expression.operator.comparative
Class Equals

java.lang.Object
  com.bea.p13n.expression.internal.ComplexExpressionImpl
      com.bea.p13n.expression.operator.Operator
          com.bea.p13n.expression.operator.comparative.ComparativeOperator
              com.bea.p13n.expression.operator.comparative.Equals

All Implemented Interfaces

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

public final class Equals
extends ComparativeOperator

Implementation of the Equals operator.
Input 1: An Object (or Expression returning an Object) that is LHS of the operator.
Input 2: An Object (or Expression returning an Object) that is RHS of the operator.
Returns: A Boolean(true) if the LHS == RHS, otherwise Boolen(false).

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

Equals()
Constructs an empty operator and operands can be added later by calling addSubExpression() on this.

Equals(Object lhs, Object rhs)
Constructs equals operator by storing the given parameters as operands of this.

Method Summary

Class[]

getParameterSignature() Returns the parameter signature for this Expression.

Methods inherited from class com.bea.p13n.expression.operator.comparative.ComparativeOperator

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

Equals

public Equals()

Constructs an empty operator and operands can be added later by calling addSubExpression() on this.

Equals

public Equals(Object lhs,
              Object rhs)

Constructs equals operator by storing the given parameters as operands of this.

Parameters

lhs - The left hand side operand of this.

rhs - The right hand side operand of this.

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.

Specified by:

getParameterSignature in interface Expression

Overrides:

getParameterSignature in class ComparativeOperator

Returns

the Class array containing the parameter signature.