- /*
- * 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 java.util.ArrayList;
- import java.util.List;
-
- import org.apache.commons.jxpath.ri.QName;
- import org.apache.commons.jxpath.ri.model.NodeIterator;
- import org.apache.commons.jxpath.ri.model.NodePointer;
- import org.w3c.dom.Attr;
- import org.w3c.dom.Element;
- import org.w3c.dom.NamedNodeMap;
- import org.w3c.dom.Node;
-
- /**
- * An iterator of attributes of a DOM Node.
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.11 $ $Date: 2004/02/29 14:17:44 $
- */
- public class DOMAttributeIterator implements NodeIterator {
- private NodePointer parent;
- private QName name;
- private List attributes;
- private int position = 0;
-
- public DOMAttributeIterator(NodePointer parent, QName name) {
- this.parent = parent;
- this.name = name;
- attributes = new ArrayList();
- Node node = (Node) parent.getNode();
- if (node.getNodeType() == Node.ELEMENT_NODE) {
- String lname = name.getName();
- if (!lname.equals("*")) {
- Attr attr = getAttribute((Element) node, name);
- if (attr != null) {
- attributes.add(attr);
- }
- }
- else {
- NamedNodeMap map = node.getAttributes();
- int count = map.getLength();
- for (int i = 0; i < count; i++) {
- Attr attr = (Attr) map.item(i);
- if (testAttr(attr, name)) {
- attributes.add(attr);
- }
- }
- }
- }
- }
-
- private boolean testAttr(Attr attr, QName testName) {
- String nodePrefix = DOMNodePointer.getPrefix(attr);
- String nodeLocalName = DOMNodePointer.getLocalName(attr);
-
- if (nodePrefix != null && nodePrefix.equals("xmlns")) {
- return false;
- }
-
- if (nodePrefix == null && nodeLocalName.equals("xmlns")) {
- return false;
- }
-
- String testLocalName = name.getName();
- if (testLocalName.equals("*") || testLocalName.equals(nodeLocalName)) {
- String testPrefix = testName.getPrefix();
-
- if (equalStrings(testPrefix, nodePrefix)) {
- return true;
- }
-
- String testNS = null;
- if (testPrefix != null) {
- testNS = parent.getNamespaceURI(testPrefix);
- }
-
- String nodeNS = null;
- if (nodePrefix != null) {
- nodeNS = parent.getNamespaceURI(nodePrefix);
- }
- return equalStrings(testNS, nodeNS);
- }
- return false;
- }
-
- private static boolean equalStrings(String s1, String s2) {
- if (s1 == null && s2 != null) {
- return false;
- }
- if (s1 != null && !s1.equals(s2)) {
- return false;
- }
- return true;
- }
-
- private Attr getAttribute(Element element, QName name) {
- String testPrefix = name.getPrefix();
- String testNS = null;
-
- if (testPrefix != null) {
- testNS = parent.getNamespaceURI(testPrefix);
- }
-
- if (testNS != null) {
- Attr attr = element.getAttributeNodeNS(testNS, name.getName());
- if (attr != null) {
- return attr;
- }
-
- // This may mean that the parser does not support NS for
- // attributes, example - the version of Crimson bundled
- // with JDK 1.4.0
- NamedNodeMap nnm = element.getAttributes();
- for (int i = 0; i < nnm.getLength(); i++) {
- attr = (Attr) nnm.item(i);
- if (testAttr(attr, name)) {
- return attr;
- }
- }
- return null;
- }
- else {
- return element.getAttributeNode(name.getName());
- }
- }
-
- public NodePointer getNodePointer() {
- if (position == 0) {
- if (!setPosition(1)) {
- return null;
- }
- position = 0;
- }
- int index = position - 1;
- if (index < 0) {
- index = 0;
- }
- return new DOMAttributePointer(parent, (Attr) attributes.get(index));
- }
-
- public int getPosition() {
- return position;
- }
-
- public boolean setPosition(int position) {
- this.position = position;
- return position >= 1 && position <= attributes.size();
- }
- }