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

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

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

    public class VariableBinding

extends Operator

Implementation of the VariableBinding operator. The variable-binding operator gives a conditional operator which supplies a place for binding a variable that will be substituted during unification. This variable can then be used in a rule action.

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
`VariableBinding(Object variable)`

Method Summary
`Object` | `accept(com.bea.p13n.expression.ExpressionVisitor expressionVisitor, Object data)`
`Class[]` | `getParameterSignature()` Returns the parameter signature for this `Expression`.
`Variable` | `getVariable()`

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

### VariableBinding

    public VariableBinding(Object variable)

Method Detail

### accept

    public Object accept(com.bea.p13n.expression.ExpressionVisitor expressionVisitor,
                         Object data)
                  throws ExpressionException

  Throws
    `ExpressionException`

### getVariable

    public Variable getVariable()

### 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