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Commons JXPath example source code file (JDOMAttributeIterator.java)

This example Commons JXPath source code file (JDOMAttributeIterator.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, arraylist, attribute, attribute, element, element, jdomattributeiterator, jdomattributepointer, list, namespace, nodeiterator, nodepointer, string, string, util

The Commons JXPath JDOMAttributeIterator.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.jdom;

import java.util.ArrayList;
import java.util.Collections;
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.jdom.Attribute;
import org.jdom.Element;
import org.jdom.Namespace;

/**
 * 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 JDOMAttributeIterator implements NodeIterator {
    private NodePointer parent;
    private List attributes;
    private int position = 0;

    /**
     * Create a new JDOMAttributeIterator.
     * @param parent pointer
     * @param name test
     */
    public JDOMAttributeIterator(NodePointer parent, QName name) {
        this.parent = parent;
        if (parent.getNode() instanceof Element) {
            Element element = (Element) parent.getNode();
            String prefix = name.getPrefix();
            Namespace ns = null;
            if (prefix != null) {
                if (prefix.equals("xml")) {
                    ns = Namespace.XML_NAMESPACE;
                }
                else {
                    String uri = parent.getNamespaceResolver().getNamespaceURI(prefix);
                    if (uri != null) {
                        ns = Namespace.getNamespace(prefix, uri);
                    }
                    if (ns == null) {
                        // TBD: no attributes
                        attributes = Collections.EMPTY_LIST;
                        return;
                    }
                }
            }
            else {
                ns = Namespace.NO_NAMESPACE;
            }

            String lname = name.getName();
            if (!lname.equals("*")) {
                attributes = new ArrayList();
                Attribute attr = element.getAttribute(lname, ns);
                if (attr != null) {
                    attributes.add(attr);
                }
            }
            else {
                attributes = new ArrayList();
                List allAttributes = element.getAttributes();
                for (int i = 0; i < allAttributes.size(); i++) {
                    Attribute attr = (Attribute) allAttributes.get(i);
                    if (ns == Namespace.NO_NAMESPACE
                            || attr.getNamespace().equals(ns)) {
                        attributes.add(attr);
                    }
                }
            }
        }
    }

    public NodePointer getNodePointer() {
        if (position == 0) {
            if (!setPosition(1)) {
                return null;
            }
            position = 0;
        }
        int index = position - 1;
        if (index < 0) {
            index = 0;
        }
        return new JDOMAttributePointer(
            parent,
            (Attribute) attributes.get(index));
    }

    public int getPosition() {
        return position;
    }

    public boolean setPosition(int position) {
        if (attributes == null) {
            return false;
        }
        this.position = position;
        return position >= 1 && position <= attributes.size();
    }
}

Other Commons JXPath examples (source code examples)

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