- /*
- * 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.compiler.NodeTest;
- import org.apache.commons.jxpath.ri.model.NodePointer;
-
- /**
- * EvalContext that walks the "ancestor::" and "ancestor-or-self::" axes.
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.15 $ $Date: 2004/03/25 03:49:50 $
- */
- public class AncestorContext extends EvalContext {
- private NodeTest nodeTest;
- private boolean setStarted = false;
- private NodePointer currentNodePointer;
- private boolean includeSelf;
-
- /**
- * @param parentContext represents the previous step on the path
- * @param includeSelf differentiates between "ancestor::" and "ancestor-
- * or-self::" axes
- * @param nameTest is the name of the element(s) we are looking for
- */
- public AncestorContext(
- EvalContext parentContext,
- boolean includeSelf,
- NodeTest nodeTest)
- {
- super(parentContext);
- this.includeSelf = includeSelf;
- this.nodeTest = nodeTest;
- }
-
- public NodePointer getCurrentNodePointer() {
- return currentNodePointer;
- }
-
- public int getDocumentOrder() {
- return -1;
- }
-
- public void reset() {
- super.reset();
- setStarted = false;
- }
-
- public boolean setPosition(int position) {
- if (position < getCurrentPosition()) {
- reset();
- }
-
- while (getCurrentPosition() < position) {
- if (!nextNode()) {
- return false;
- }
- }
- return true;
- }
-
- public boolean nextNode() {
- if (!setStarted) {
- setStarted = true;
- currentNodePointer = parentContext.getCurrentNodePointer();
- if (includeSelf) {
- if (currentNodePointer.testNode(nodeTest)) {
- position++;
- return true;
- }
- }
- }
-
- while (true) {
- currentNodePointer = currentNodePointer.getImmediateParentPointer();
-
- if (currentNodePointer == null) {
- return false;
- }
-
- if (currentNodePointer.testNode(nodeTest)) {
- position++;
- return true;
- }
- }
- }
- }