If Class

com.bea.p13n.expression.operator
If Class

public final class If

    extends Operator

Implementation of the If operator. The If operator consists of three parts, the condition, the true action and the false action. If the condition evaluates to true the true action is evaluated otherwise the false condition is evaluated.
Input 1: A Boolean object or Expression returning a Boolean object.
Input 2: An Expression
Input 3 (optional): An Expression.
Returns: The result of evaluating the true or false expression.

Hierarchy
Object
  ComplexExpressionImpl
    Operator
      If
All Implemented Interfaces

Cloneable, Expression, Serializable

Constructor Summary
If()

Constructs an empty operator and operands can be added later by calling addSubExpression() on this.
If(Object logical, Object trueEx, Object falseEx)

Constructs this operator for the given operands.
 

Method Summary
public Object
getFalseExpression()
public Object
getLogicalExpression()
public Class[]
getParameterSignature()
Returns the parameter signature for this Expression.
public Object
getTrueExpression()
 
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
 

Constructor Detail

If

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

If

public If(Object logical, 
          Object trueEx, 
          Object falseEx)
Constructs this operator for the given operands.
 

Method Detail

getFalseExpression() Method

public Object getFalseExpression()

getLogicalExpression() Method

public Object getLogicalExpression()

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.

getTrueExpression() Method

public Object getTrueExpression()