1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.xpath.internal; 23 24import javax.xml.transform.SourceLocator; 25 26/** 27 * A class that implements this interface can construct expressions, 28 * give information about child and parent expressions, 29 * and give the originating source information. A class that implements 30 * this interface does not lay any claim to being directly executable. 31 * 32 * <p>Note: This interface should not be considered stable. Only exprSetParent 33 * and exprGetParent can be counted on to work reliably. Work in progress.</p> 34 */ 35public interface ExpressionNode extends SourceLocator 36{ 37 /** This pair of methods are used to inform the node of its 38 parent. */ 39 public void exprSetParent(ExpressionNode n); 40 public ExpressionNode exprGetParent(); 41 42 /** This method tells the node to add its argument to the node's 43 list of children. */ 44 public void exprAddChild(ExpressionNode n, int i); 45 46 /** This method returns a child node. The children are numbered 47 from zero, left to right. */ 48 public ExpressionNode exprGetChild(int i); 49 50 /** Return the number of children the node has. */ 51 public int exprGetNumChildren(); 52} 53