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

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`

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.

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`

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Copyright © 2004 BEA Systems, Inc. All Rights Reserved