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The source code/* * 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. */ package org.apache.commons.jxpath.ri.axes; import org.apache.commons.jxpath.ri.EvalContext; import org.apache.commons.jxpath.ri.QName; import org.apache.commons.jxpath.ri.compiler.NodeNameTest; import org.apache.commons.jxpath.ri.compiler.NodeTest; import org.apache.commons.jxpath.ri.model.NodeIterator; import org.apache.commons.jxpath.ri.model.NodePointer; /** * EvalContext that walks the "attribute::" axis. * * @author Dmitri Plotnikov * @version $Revision: 1.10 $ $Date: 2004/02/29 14:17:38 $ */ public class AttributeContext extends EvalContext { private NodeTest nodeTest; private boolean setStarted = false; private NodeIterator iterator; private NodePointer currentNodePointer; /** * @param parentContext represents the previous step on the path * @param nameTest is the name of the attribute we are looking for */ public AttributeContext(EvalContext parentContext, NodeTest nodeTest) { super(parentContext); this.nodeTest = nodeTest; } public NodePointer getCurrentNodePointer() { return currentNodePointer; } public void reset() { setStarted = false; iterator = null; super.reset(); } public boolean setPosition(int position) { if (position < getCurrentPosition()) { reset(); } while (getCurrentPosition() < position) { if (!nextNode()) { return false; } } return true; } public boolean nextNode() { super.setPosition(getCurrentPosition() + 1); if (!setStarted) { setStarted = true; if (!(nodeTest instanceof NodeNameTest)) { return false; } QName name = ((NodeNameTest) nodeTest).getNodeName(); iterator = parentContext.getCurrentNodePointer().attributeIterator(name); } if (iterator == null) { return false; } if (!iterator.setPosition(iterator.getPosition() + 1)) { return false; } currentNodePointer = iterator.getNodePointer(); return true; } } |
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