com.bea.p13n.expression.operator
Class ObjectHashCode

java.lang.Object
  com.bea.p13n.expression.internal.ComplexExpressionImpl
      com.bea.p13n.expression.operator.Operator
          com.bea.p13n.expression.operator.ObjectHashCode

All Implemented Interfaces:

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

public final class ObjectHashCode

extends Operator

implements UnaryOperator

Implementation of the ObjectHashCode operator. Returns the hash code for an Object instance.
Input 1: An Object or Expression returning an Object.
Returns: An Integer that is the result of calling hashCode on the Object.

See Also:

Serialized Form

Field Summary

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

UNARY_OPERAND_INDEX

Constructor Summary

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

ObjectHashCode(Object obj)
Constructs this by associating the given parameter as an operand of this.

Method Summary

Object	getOperand() Returns unary operand.
Class[]	getParameterSignature() Returns the parameter signature for this Expression.

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

ObjectHashCode

public ObjectHashCode()

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

ObjectHashCode

public ObjectHashCode(Object obj)

Constructs this by associating the given parameter as an operand of this.

Method Detail

getOperand

public Object getOperand()

Description copied from interface: UnaryOperator

Returns unary operand.

Specified by:

getOperand in interface UnaryOperator

Returns:

An unary operand.

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

Returns:

the Class array containing the parameter signature.