Equals Class

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

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).


Hierarchy
Object
  ComplexExpressionImpl
    Operator
      ComparativeOperator
        Equals
All Implemented Interfaces

BinaryOperator, Cloneable, Expression, Serializable

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

public Class[]
getParameterSignature()
Returns the parameter signature for this Expression.
 
Methods from  com.bea.p13n.expression.operator.comparative.ComparativeOperator
getLeftHandSide, getRightHandSide
 
Methods from  com.bea.p13n.expression.operator.Operator
leftHandSide, operand, rightHandSide
 
Methods from  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 from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
   
Methods from interface com.bea.p13n.expression.operator.BinaryOperator
getLeftHandSide, getRightHandSide
 
Methods from interface com.bea.p13n.expression.Expression
accept, addListener, addSubExpression, clearCache, clone, getCachedValue, getParameterSignature, getParent, getSource, getSubExpression, getSubExpressionCount, getUserData, isCached, isCacheEnabled, removeAllSubExpressions, removeListener, removeSubExpression, removeSubExpression, setCachedValue, setCacheEnabled, setSource, setSubExpression, setUserData, write
 

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.
 

Method Detail

getParameterSignature() Method

public Class[] getParameterSignature()
Description copied from Expression.getParameterSignature()
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.

Overrides
ComparativeOperator.getParameterSignature()

Returns

the Class array containing the parameter signature.