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Commons JXPath example source code file (DOMAttributeIterator.java)
The Commons JXPath DOMAttributeIterator.java source code/* * 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.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: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $ */ public class DOMAttributeIterator implements NodeIterator { private NodePointer parent; private QName name; private List attributes; private int position = 0; /** * Create a new DOMAttributeIterator. * @param parent pointer * @param name to test */ 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)) { attributes.add(attr); } } } } } /** * Test an attribute. * @param attr to test * @return whether test succeeded */ private boolean testAttr(Attr attr) { 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 = name.getPrefix(); if (testPrefix == null || equalStrings(testPrefix, nodePrefix)) { return true; } if (nodePrefix == null) { return false; } return equalStrings(parent.getNamespaceURI(testPrefix), parent .getNamespaceURI(nodePrefix)); } return false; } /** * Test whether two strings are == or .equals() * @param s1 first string * @param s2 second string * @return boolean */ private static boolean equalStrings(String s1, String s2) { return s1 == s2 || s1 != null && s1.equals(s2); } /** * Get the named attribute. * @param element to search * @param name to match * @return Attr found */ private Attr getAttribute(Element element, QName name) { String testPrefix = name.getPrefix(); String testNS = null; if (testPrefix != null) { testNS = parent.getNamespaceResolver().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)) { return attr; } } return null; } 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(); } } Other Commons JXPath examples (source code examples)Here is a short list of links related to this Commons JXPath DOMAttributeIterator.java source code file: |
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