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Commons JXPath example source code file (DOMAttributeIterator.java)

This example Commons JXPath source code file (DOMAttributeIterator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

arraylist, attr, attr, dom, domattributeiterator, domattributepointer, namednodemap, namednodemap, node, nodeiterator, nodepointer, qname, qname, string, string, util

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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