- /*
- * 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.model.dom;
-
- import org.apache.commons.jxpath.ri.compiler.NodeTest;
- import org.apache.commons.jxpath.ri.model.NodeIterator;
- import org.apache.commons.jxpath.ri.model.NodePointer;
- import org.w3c.dom.Node;
-
- /**
- * An iterator of children of a DOM Node.
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.11 $ $Date: 2004/04/01 02:55:32 $
- */
- public class DOMNodeIterator implements NodeIterator {
- private NodePointer parent;
- private NodeTest nodeTest;
- private Node node;
- private Node child = null;
- private boolean reverse;
- private int position = 0;
-
- public DOMNodeIterator(
- NodePointer parent,
- NodeTest nodeTest,
- boolean reverse,
- NodePointer startWith)
- {
- this.parent = parent;
- this.node = (Node) parent.getNode();
- if (startWith != null) {
- this.child = (Node) startWith.getNode();
- }
- this.nodeTest = nodeTest;
- this.reverse = reverse;
- }
-
- public NodePointer getNodePointer() {
- if (position == 0) {
- setPosition(1);
- }
- if (child == null) {
- return null;
- }
- return new DOMNodePointer(parent, child);
- }
-
- public int getPosition() {
- return position;
- }
-
- public boolean setPosition(int position) {
- while (this.position < position) {
- if (!next()) {
- return false;
- }
- }
- while (this.position > position) {
- if (!previous()) {
- return false;
- }
- }
- return true;
- }
-
- private boolean previous() {
- position--;
- if (!reverse) {
- if (position == 0) {
- child = null;
- }
- else if (child == null) {
- child = node.getLastChild();
- }
- else {
- child = child.getPreviousSibling();
- }
- while (child != null && !testChild()) {
- child = child.getPreviousSibling();
- }
- }
- else {
- child = child.getNextSibling();
- while (child != null && !testChild()) {
- child = child.getNextSibling();
- }
- }
- return child != null;
- }
-
- private boolean next() {
- position++;
- if (!reverse) {
- if (position == 1) {
- if (child == null) {
- child = node.getFirstChild();
- }
- else {
- child = child.getNextSibling();
- }
- }
- else {
- child = child.getNextSibling();
- }
- while (child != null && !testChild()) {
- child = child.getNextSibling();
- }
- }
- else {
- if (position == 1) {
- if (child == null) {
- child = node.getLastChild();
- }
- else {
- child = child.getPreviousSibling();
- }
- }
- else {
- child = child.getPreviousSibling();
- }
- while (child != null && !testChild()) {
- child = child.getPreviousSibling();
- }
- }
- return child != null;
- }
-
- private boolean testChild() {
- return DOMNodePointer.testNode(child, nodeTest);
- }
- }