| /* |
| * 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(); |
| } |
| |