001/*
002 * Copyright (c) 2004-2012, Willem Cazander
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
006 * that the following conditions are met:
007 * 
008 * * Redistributions of source code must retain the above copyright notice, this list of conditions and the
009 *   following disclaimer.
010 * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
011 *   the following disclaimer in the documentation and/or other materials provided with the distribution.
012 * 
013 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
014 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
015 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
016 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
018 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
019 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
020 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
021 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
022 */
023
024package org.x4o.xml.impl;
025
026import java.util.logging.Logger;
027
028import org.x4o.xml.core.config.X4OLanguageClassLoader;
029import org.x4o.xml.element.Element;
030import org.x4o.xml.element.ElementClass;
031import org.x4o.xml.element.ElementLanguage;
032import org.x4o.xml.element.ElementNamespaceContext;
033import org.x4o.xml.element.ElementNamespaceInstanceProvider;
034import org.x4o.xml.element.ElementNamespaceInstanceProviderException;
035
036/**
037 * DefaultElementNamespaceInstanceProvider creates and configures an Element instance.
038 * 
039 * @author Willem Cazander
040 * @version 1.0 Aug 17, 2005
041 */
042public class DefaultElementNamespaceInstanceProvider implements ElementNamespaceInstanceProvider {
043
044        private Logger logger = null;
045        private ElementLanguage elementLanguage = null;
046        private ElementNamespaceContext elementNamespaceContext = null;
047        
048        /**
049         * Creates new DefaultElementNamespaceInstanceProvider.
050         */
051        public DefaultElementNamespaceInstanceProvider() {
052                logger = Logger.getLogger(DefaultElementNamespaceInstanceProvider.class.getName());
053        }
054
055        /**
056         * @param       elementLanguage The elementLanguage of this provider.
057         * @param       elementNamespaceContext The elementNamespaceContext for this provider.
058         * @see org.x4o.xml.element.ElementNamespaceInstanceProvider#start(org.x4o.xml.element.ElementLanguage, org.x4o.xml.element.ElementNamespaceContext)
059         */
060        public void start(ElementLanguage elementLanguage,ElementNamespaceContext elementNamespaceContext) {
061                this.elementLanguage=elementLanguage;
062                this.elementNamespaceContext=elementNamespaceContext;
063                logger.finer("Starting DefaultElementNamespaceInstanceProvider for: "+elementNamespaceContext.getUri());
064        }
065
066        /**
067         * @param       tag     The xml tag to create an Element instance for.
068         * @return      The Element to handle the given tag.
069         * @throws ElementNamespaceInstanceProviderException 
070         * @see org.x4o.xml.element.ElementNamespaceInstanceProvider#createElementInstance(java.lang.String)
071         */
072        public Element createElementInstance(String tag) throws ElementNamespaceInstanceProviderException {
073                ElementClass    elementClass    = elementNamespaceContext.getElementClass(tag);
074                Element                 element                 = null;
075                
076                if (elementClass==null) {
077                        throw new ElementNamespaceInstanceProviderException(this,"Tag: " + tag + " unknown in: " + elementNamespaceContext.getUri());
078                }
079                
080                try {
081                        if (elementClass.getElementClass()!=null) {
082                                Object obj = X4OLanguageClassLoader.newInstance(elementClass.getElementClass());
083                                if ((obj instanceof Element) == false) {
084                                        throw new ElementNamespaceInstanceProviderException(this,"Provided elementClassName is not an Element: "+obj.getClass());
085                                }
086                                element = (Element) obj;
087                        } else {
088                                element = (Element)X4OLanguageClassLoader.newInstance((elementLanguage.getLanguageConfiguration().getDefaultElement()));
089                        }
090                        
091                        if (elementClass.getObjectClass()!=null) {
092                                element.setElementObject(X4OLanguageClassLoader.newInstance(elementClass.getObjectClass()));
093                        }
094                } catch (InstantiationException e) {
095                        throw new ElementNamespaceInstanceProviderException(this,"Error while providing Element: "+e.getMessage(),e);
096                } catch (IllegalAccessException e) {
097                        throw new ElementNamespaceInstanceProviderException(this,"Error while providing Element: "+e.getMessage(),e);
098                } /*catch (ClassNotFoundException e) {
099                        throw new ElementNamespaceInstanceProviderException(this,"Error while providing Element: "+e.getMessage(),e);
100                } */
101                element.setElementClass(elementClass);
102                element.setElementLanguage(elementLanguage);
103                return element;
104        }
105}