ObjectToString Class

com.bea.p13n.expression.operator
ObjectToString Class

public final class ObjectToString

    extends Operator
    implements UnaryOperator

Implementation of the ObjectToString operator. Returns the String representation for an Object instance.
Input 1: An Object or Expression returning an Object.
Returns: A String that is the result of calling toString on the Object.


Hierarchy
Object
  ComplexExpressionImpl
    Operator
      ObjectToString
All Implemented Interfaces

Cloneable, Expression, Serializable, UnaryOperator

Constructor Summary

ObjectToString()

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

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

Method Summary

public Object
getOperand()
Returns unary operand.
public Class[]
getParameterSignature()
Returns the parameter signature for this Expression.
 
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.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
 
Methods from interface com.bea.p13n.expression.operator.UnaryOperator
getOperand
 

Constructor Detail

ObjectToString

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

ObjectToString

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

Method Detail

getOperand() Method

public Object getOperand()
Description copied from UnaryOperator.getOperand()
Returns unary operand.

Returns

An unary operand.

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.

Returns

the Class array containing the parameter signature.