configuration.java

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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" must
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 *
 * Portions of this software are based upon public domain software
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package net.java.mais.gui.config.xml;

import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * Loads the configuration from the config file
 * ans stores it in the appropriate objects
 *
 * @author Damian Minkov
 */

public class Configuration
{

    private ConfiguraionTree configuraionTree = null;

    private Document document = null;

    public static final String DEFAULT_PARSER_NAME = "dom.wrappers.Xerces";

    public static final String ATTRIBUTE_NAME = "name";
    public static final String ATTRIBUTE_TYPE = "type";

    public static final String VALUE_NODE_NAME = "value";
    public static final String ALLOWEDVALUES_NODE_NAME = "allowedvalues";
    public static final String LABLENAME_NODE_NAME = "labelname";
    public static final String DESCRIPTION_NODE_NAME = "description";
    private String tittle;

    public Configuration()
    {
        configuraionTree = new ConfiguraionTree();
    }

    /**
     * Loads the configuration
     */
    public void loadConfiguration()
    {
        try
        {
            buildTree();
        }
        finally
        {
        }
    }

    private void buildTree()
    {
        try
        {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            InputStream guiConfigStream = this.getClass().getResourceAsStream(getConfigurationFile());
            if(guiConfigStream == null)
            {
                return;
            }
            document = builder.parse(guiConfigStream);

            Node root = document.getFirstChild();

            tittle =  XMLUtils.getAttributeByName(root, "tittle");

            Node temp = null;
            NodeList children = root.getChildNodes();
            for(int i = 0; i < children.getLength(); i++)
            {
                temp = children.item(i);

                if(temp.getNodeType() == Node.ELEMENT_NODE)
                {
                    configuraionTree.addConfiguration
                    (
                        XMLUtils.getAttributeByName(temp, ATTRIBUTE_NAME).trim(),
                        buildConfigNodes(temp)
                    );
                }
            }
        }
        catch(IOException ex)
        {
        }
        catch(SAXException ex)
        {
        }
        catch(ParserConfigurationException ex)
        {
        }
        finally
        {
        }
    }

    /**
     * Returns instance of the configuration file
     * @return
     */
    public String getConfigurationFile()
    {
        return "gui-config.xml";
    }

    /**
     *  Adding Properties to all ConfigNodes
     */
    private Vector buildConfigNodes(Node node)
    {
        try
        {
            Vector results = new Vector();
            Node temp = null;
            NodeList children = node.getChildNodes();
            for(int i = 0; i < children.getLength(); i++)
            {
                temp = children.item(i);
                if(temp.getNodeType() == Node.ELEMENT_NODE)
                {
                    results.add(buildSingleConfigNode(temp));
                }
            }

            return results;
        }
        finally
        {
        }
    }

    private ConfigNode buildSingleConfigNode(Node node)
    {
        try
        {
 
            ConfigNode res = new ConfigNode(node.getNodeName().trim());

            Node temp = null;
            NodeList children = node.getChildNodes();
            for(int i = 0; i < children.getLength(); i++)
            {
                temp = children.item(i);
                if(temp.getNodeType() == Node.ELEMENT_NODE)
                {
                    res.addProperty(buildProperty(temp));
                }
            }

            return res;
        }
        finally
        {
         }
    }

    private Property buildProperty(Node node)
    {
        String name = XMLUtils.getAttributeByName(node, ATTRIBUTE_NAME);
        String allowedValuesType = null;
        String[] allowedValues = null;
        String labelName = null;
        String description = null;

        Node temp = null;
        NodeList children = node.getChildNodes();
        for(int i = 0; i < children.getLength(); i++)
        {
            temp = children.item(i);
            if(temp.getNodeType() == Node.ELEMENT_NODE)
            {
                String nodeName = temp.getNodeName();
                if(nodeName.equals(ALLOWEDVALUES_NODE_NAME))
                {
                    allowedValuesType = XMLUtils.getAttributeByName(temp,
                        ATTRIBUTE_TYPE);
                    Vector re = new Vector();
                    Node tempValueNode = null;
                    NodeList childs = temp.getChildNodes();
                    for(int j = 0; j < childs.getLength(); j++)
                    {
                        tempValueNode = childs.item(j);
                        if(tempValueNode.getNodeType() == Node.ELEMENT_NODE)
                        {
                            String v = XMLUtils.getElementTextValue((Element)tempValueNode);
                            if(v != null && v.length() > 0)
                                re.add(v);
                        }
                    }

                    if(re.size() > 0)
                    {
                        allowedValues = new String[re.size()];
                        re.toArray(allowedValues);
                    }
                }
                else
                    if(nodeName.equals(LABLENAME_NODE_NAME))
                    {
                        labelName = XMLUtils.getElementTextValue((Element)temp);
                    }
                    else
                        if(nodeName.equals(DESCRIPTION_NODE_NAME))
                        {
                            description = XMLUtils.getElementCDataValue((Element)temp);
                        }
            }

        }

        return new Property(name, allowedValuesType, allowedValues,
                            labelName, description);
    }

    /**
     * Returns the configuration tree
     * @return
     */
    public ConfiguraionTree getConfiguraionTree()
    {
        return configuraionTree;
    }

    public String toString()
    {
        return "Configuration";
    }

    /**
     * The tittle for this configuration
     * Mostly used for the GUI-Window Tittle
     * @return the tittle.
     */
    public String getTittle()
    {
        return tittle;
    }
}