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## com.bea.p13n.expression.operator
Class If

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

All Implemented Interfaces
  Expression, com.bea.p13n.expression.ExpressionEvents, Serializable, Cloneable

    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.

See Also
  Serialized Form

Field Summary

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
`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
`Object` | `getFalseExpression()`
`Object` | `getLogicalExpression()`
`Class[]` | `getParameterSignature()` Returns the parameter signature for this `Expression`.
`Object` | `getTrueExpression()`

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

### 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.

  Parameters
    `logical` - A Boolean object or expression returning a Boolean object.
    `trueEx` - An expression that is executed if `logical` returns Boolean true object.
    `falseEx` - An expression that is executed if `logical` returns Boolean false object.

Method Detail

### getLogicalExpression

    public Object getLogicalExpression()

### getTrueExpression

    public Object getTrueExpression()

### getFalseExpression

    public Object getFalseExpression()

### 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.

  Returns
    the Class array containing the parameter signature.

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Copyright © 2008 BEA Systems, Inc. All Rights Reserved