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Echo Web Framework API
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/* 
 * This file is part of the Echo Web Application Framework (hereinafter "Echo").
 * Copyright (C) 2002-2009 NextApp, Inc.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */

package nextapp.echo.app.serial.property;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;

import org.w3c.dom.Element;

import nextapp.echo.app.LayoutData;
import nextapp.echo.app.Style;
import nextapp.echo.app.reflect.IntrospectorFactory;
import nextapp.echo.app.reflect.ObjectIntrospector;
import nextapp.echo.app.serial.SerialContext;
import nextapp.echo.app.serial.SerialException;
import nextapp.echo.app.serial.SerialPropertyPeer;
import nextapp.echo.app.serial.Serializer;
import nextapp.echo.app.util.Context;

/**
 * SerialPropertyPeer for LayoutData properties.
 */
public class LayoutDataPeer 
implements SerialPropertyPeer {
    
    /**
     * @see nextapp.echo.app.serial.SerialPropertyPeer#toProperty(nextapp.echo.app.util.Context, 
     *      java.lang.Class, org.w3c.dom.Element)
     */
    public Object toProperty(Context context, Class objectClass, Element propertyElement) 
    throws SerialException {        
        try {
            SerialContext serialContext = (SerialContext) context.get(SerialContext.class);
            
            String type = propertyElement.getAttribute("t");

            // Load properties from XML into Style.
            Serializer serializer = Serializer.forClassLoader(serialContext.getClassLoader());
            Style propertyStyle = serializer.loadStyle(serialContext, type, propertyElement);
            
            // Instantiate LayoutData instance.
            Class propertyClass = Class.forName(type, true, serialContext.getClassLoader());
            LayoutData layoutData = (LayoutData) propertyClass.newInstance();
            
            // Create introspector to analyze LayoutData class.
            ObjectIntrospector introspector = IntrospectorFactory.get(type, serialContext.getClassLoader());
            
            // Set property values of LayoutData instance.
            Iterator it = propertyStyle.getPropertyNames();
            while (it.hasNext()) {
                String propertyName = (String) it.next();
                Method writeMethod = introspector.getWriteMethod(propertyName);
                writeMethod.invoke(layoutData, new Object[]{propertyStyle.get(propertyName)});
            }
            
            return layoutData;
        } catch (ClassNotFoundException ex) {
            throw new SerialException("Unable to process properties.", ex);
        } catch (SerialException ex) {
            throw new SerialException("Unable to process properties.", ex);
        } catch (InstantiationException ex) {
            throw new SerialException("Unable to process properties.", ex);
        } catch (IllegalAccessException ex) {
            throw new SerialException("Unable to process properties.", ex);
        } catch (IllegalArgumentException ex) {
            throw new SerialException("Unable to process properties.", ex);
        } catch (InvocationTargetException ex) {
            throw new SerialException("Unable to process properties.", ex);
        }
    }

    /**
     * @see nextapp.echo.app.serial.SerialPropertyPeer#toXml(nextapp.echo.app.util.Context, 
     *      java.lang.Class, org.w3c.dom.Element, java.lang.Object)
     */
    public void toXml(Context context, Class objectClass, Element propertyElement, Object propertyValue) 
    throws SerialException {
        throw new UnsupportedOperationException();
    }
}