alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

What this is

This file 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.

Other links

The source code

package net.myvietnam.mvncore.configuration;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.net.URL;
import java.util.Iterator;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
 * <p>A specialized hierarchical configuration class that is able to parse
 * XML documents using DOM4J.</p>
 * <p>The parsed document will be stored keeping its structure. The
 * contained properties can be accessed using all methods supported by
 * the base class <code>HierarchicalProperties.
 *
 * @author <a href="mailto:oliver.heger@t-online.de">Oliver Heger
 * @version $Id: HierarchicalDOM4JConfiguration.java,v 1.1 2003/12/09 08:25:30 huumai Exp $
 */
public class HierarchicalDOM4JConfiguration
    extends HierarchicalConfiguration
    implements BasePathLoader
{
    /** Stores the file name of the document to be parsed.*/
    private String file;

    /** Stores the base path of this configuration.*/
    private String basePath;

    /**
     * Creates a new instance of <code>HierarchicalDOM4JConfiguration.
     */
    public HierarchicalDOM4JConfiguration()
    {
        super();
    }

    /**
     * Creates a new instance of <code>HierarchicalDOM4JConfiguration
     * and sets the default properties.
     * @param defaults the default properties
     */
    public HierarchicalDOM4JConfiguration(Configuration defaults)
    {
        super(defaults);
    }

    /**
     * Returns the name of the file to be parsed by this object.
     * @return the file to be parsed
     */
    public String getFileName()
    {
        return file;
    }

    /**
     * Sets the name of the file to be parsed by this object.
     * @param file the file to be parsed
     */
    public void setFileName(String file)
    {
        this.file = file;
    }

    /**
     * Returns the base path.
     * @return the base path
     */
    public String getBasePath()
    {
        return basePath;
    }

    /**
     * Allows to set a base path. Relative file names are resolved based on
     * this path.
     * @param path the base path; this can be a URL or a file path
     */
    public void setBasePath(String path)
    {
        basePath = path;
    }

    /**
     * Loads and parses an XML document. The file to be loaded must have
     * been specified before.
     * @throws Exception if an error occurs
     */
    public void load() throws Exception
    {
        load(ConfigurationUtils.getURL(getBasePath(), getFileName()));
    }

    /**
     * Loads and parses the specified XML document.
     * @param url the URL to the XML document
     * @throws Exception if an error occurs
     */
    public void load(URL url) throws Exception
    {
        initProperties(new SAXReader().read(url));
    }

    /**
     * Initializes this configuration from an XML document.
     * @param document the document to be parsed
     */
    public void initProperties(Document document)
    {
        constructHierarchy(getRoot(), document.getRootElement());
    }

    /**
     * Helper method for building the internal storage hierarchy. The XML
     * elements are transformed into node objects.
     * @param node the actual node
     * @param element the actual XML element
     */
    private void constructHierarchy(Node node, Element element)
    {
        if (element.getTextTrim().length() > 0)
        {
            node.setValue(element.getTextTrim());
        } /* if */
        processAttributes(node, element);

        for (Iterator it = element.elementIterator(); it.hasNext();)
        {
            Element child = (Element) it.next();
            Node childNode = new Node(child.getName());
            constructHierarchy(childNode, child);
            node.addChild(childNode);
        } /* for */
    }

    /**
     * Helper method for constructing node objects for the attributes of the
     * given XML element.
     * @param node the actual node
     * @param element the actual XML element
     */
    private void processAttributes(Node node, Element element)
    {
        for (Iterator it = element.attributeIterator(); it.hasNext();)
        {
            Attribute attr = (Attribute) it.next();
            Node child =
                new Node(
                    ConfigurationKey.constructAttributeKey(attr.getName()));
            child.setValue(attr.getValue());
            node.addChild(child);
        } /* for */
    }
}
... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.