/* $Id$ */
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.manifoldcf.scriptengine;
/** This interface represents a mutable reference to a variable.
* It exists as a separate entity so that the reference to the underlying
* variable can be easily modified. The reference can, of course, be null.
*/
public interface VariableReference
{
/** Set the reference */
public void setReference(Variable object)
throws ScriptException;
/** Resolve the reference */
public Variable resolve()
throws ScriptException;
/** Check if this reference is null */
public boolean isNull();
}