| /* |
| * 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.commons.jxpath.ri.axes; |
| |
| import org.apache.commons.jxpath.Pointer; |
| import org.apache.commons.jxpath.ri.EvalContext; |
| import org.apache.commons.jxpath.ri.compiler.NodeTest; |
| import org.apache.commons.jxpath.ri.model.NodePointer; |
| |
| /** |
| * EvalContext that returns the current node from the parent context if the |
| * test succeeds. |
| * |
| * @author Dmitri Plotnikov |
| * @version $Revision$ $Date$ |
| */ |
| public class SelfContext extends EvalContext { |
| private NodeTest nodeTest; |
| private boolean startedSet = false; |
| private NodePointer nodePointer; |
| |
| /** |
| * Create a new SelfContext. |
| * @param parentContext EvalContext |
| * @param nodeTest guard |
| */ |
| public SelfContext(EvalContext parentContext, NodeTest nodeTest) { |
| super(parentContext); |
| this.nodeTest = nodeTest; |
| } |
| |
| public Pointer getSingleNodePointer() { |
| return parentContext.getSingleNodePointer(); |
| } |
| |
| public NodePointer getCurrentNodePointer() { |
| if (position == 0) { |
| if (!setPosition(1)) { |
| return null; |
| } |
| } |
| return nodePointer; |
| } |
| |
| public boolean nextNode() { |
| return setPosition(getCurrentPosition() + 1); |
| } |
| |
| public void reset() { |
| super.reset(); |
| startedSet = false; |
| } |
| |
| public boolean setPosition(int position) { |
| if (position != 1) { |
| return false; |
| } |
| super.setPosition(position); |
| if (!startedSet) { |
| startedSet = true; |
| nodePointer = (NodePointer) parentContext.getCurrentNodePointer(); |
| } |
| |
| if (nodePointer == null) { |
| return false; |
| } |
| |
| return nodeTest == null || nodePointer.testNode(nodeTest); |
| } |
| } |