com.bea.p13n.expression.operator
Class Instanceof

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

All Implemented Interfaces:

BinaryOperator, Cloneable, Expression, ExpressionEvents, Serializable

public final class Instanceof

extends Operator

implements BinaryOperator

Implementation of the Instanceof operator. Returns a Boolean if the Object parameter (which can be an expression) is an instance of a class type.
Input 1: An object or Expression returning an object.
Input 2: A Class or an Expression returning a Class
Returns: A Boolean that is the result of testing the object against the Class.

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

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

Instanceof(Object obj, Class clazz)
Constructs this by associating the given parameters as operands.

Method Summary

Object	getLeftHandSide() Returns left hand side operand of this binary operator.
Class[]	getParameterSignature() Returns the parameter signature for this Expression.
Object	getRightHandSide() Returns right hand side operand of this binary operator.
Object	getTargetClass() Returns Class operand of this operator.
Object	getTargetObject() Returns Object operand of this operator.

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

Instanceof

public Instanceof()

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

Instanceof

public Instanceof(Object obj,
                  Class clazz)

Constructs this by associating the given parameters as operands.

Parameters:

obj - An Object or Expression returning an object.

clazz - A Class or an Expression returning a Class.

Method Detail

getTargetObject

public Object getTargetObject()

Returns Object operand of this operator.

Returns:

Object An Object or Expression that is used as an Object operand of this.

getTargetClass

public Object getTargetClass()

Returns Class operand of this operator.

Returns:

Object representing a Class operand of this.

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.

getLeftHandSide

public Object getLeftHandSide()

Description copied from interface: BinaryOperator

Returns left hand side operand of this binary operator.

Specified by:

getLeftHandSide in interface BinaryOperator

Returns:

The left hand side operand.

getRightHandSide

public Object getRightHandSide()

Description copied from interface: BinaryOperator

Returns right hand side operand of this binary operator.

Specified by:

getRightHandSide in interface BinaryOperator

Returns:

The left hand side operand.