- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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,v 1.3 2004/02/17 04:30:02 minchau Exp $
- */
- package com.sun.org.apache.xpath.internal;
-
- 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();
- }
-