/*
* 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.
*/
/*
* $Id: ExpressionNode.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath;
import javax.xml.transform.SourceLocator;
/**
* A class that implements this interface can construct expressions,
* give information about child and parent expressions,
* and give the originating source information. A class that implements
* this interface does not lay any claim to being directly executable.
*
* <p>Note: This interface should not be considered stable. Only exprSetParent
* and exprGetParent can be counted on to work reliably. Work in progress.</p>
*/
public interface ExpressionNode extends SourceLocator
{
/** This pair of methods are used to inform the node of its
parent. */
public void exprSetParent(ExpressionNode n);
public ExpressionNode exprGetParent();
/** This method tells the node to add its argument to the node's
list of children. */
public void exprAddChild(ExpressionNode n, int i);
/** This method returns a child node. The children are numbered
from zero, left to right. */
public ExpressionNode exprGetChild(int i);
/** Return the number of children the node has. */
public int exprGetNumChildren();
}