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/*******************************************************************************
 * Copyright (c) 2003, 2007 s IT Solutions AT Spardat GmbH .
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     s IT Solutions AT Spardat GmbH - initial API and implementation
 *******************************************************************************/

/*
 * Created on : 09.07.2003
 * Created by : s3595
 */
package at.spardat.xma.boot.server;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Properties;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import at.spardat.xma.boot.Statics;
import at.spardat.xma.boot.comp.AppLoader;
import at.spardat.xma.boot.comp.AppLoaderBase;
import at.spardat.xma.boot.comp.data.XMAApp;
import at.spardat.xma.boot.comp.data.XMAAppParser;
import at.spardat.xma.boot.util.Util;

/**
 * ServerAppLoader
 *
 * @author s3595 Chr. Schaefer (CGS)
 * @version $Id: ServerAppLoader.java 11290 2013-12-12 16:00:27Z dschwarz $
 *
 */
public class ServerAppLoader extends AppLoaderBase {

    /** the application descriptor of this webapplication */
    private static XMAApp xmaapp;

    /** the hash code of the application descritptor */
    private static byte[] digest_;

    /**
     * @param pnew configuration properties
     */
    public ServerAppLoader(Properties pnew) {
        super(pnew);
    }


    /**
     * load and parse application descriptors.
     *
     * @param context      servlet context
     * @throws Exception
     */
    public void loadApplication ( ServletContext context ) throws Exception {
        InputStream is=null;
        InputStream ispi=null;
        try {
            is   = context.getResourceAsStream( "/" + Statics.APP_DISCRIPTOR); //$NON-NLS-1$
            ispi = context.getResourceAsStream( "/" + Statics.PLUGIN_DISCRIPTOR); //$NON-NLS-1$

            XMAAppParser parser = new XMAAppParser( super.parseLog_, true, null );
            XMAApp       xmaapp = parser.parse( is );

            if( ispi != null) {
                XMAApp plugins = parser.parse( ispi );
                super.mergeInto(xmaapp, plugins);
            }

            AppLoader.checkResourceIntegrity( xmaapp );
            ArrayList missing = AppLoader.checkPluginSpecImpl( xmaapp );

            if( missing.size() > 0 ){
                throw new ServletException("XMA Application Descriptor has missing plugin-resources: " + missing ); //$NON-NLS-1$
            }
            createApplicationHash(context);
            ServerAppLoader.setXmaapp( xmaapp );
        } finally {
            Util.close(is,Statics.APP_DISCRIPTOR);
            Util.close(ispi,Statics.APP_DISCRIPTOR);
        }
    }

    /**
     * computes and sets the application hash code
     *
     * @param context     Servlet context
     * @throws Exception  NoSuchAlgorithm and IOException
     */
    private void createApplicationHash( ServletContext context ) throws Exception {
        InputStream isApp=null;
        InputStream isPi=null;
        try {
            isApp = context.getResourceAsStream( "/" + Statics.APP_DISCRIPTOR); //$NON-NLS-1$
            isPi  = context.getResourceAsStream( "/" + Statics.PLUGIN_DISCRIPTOR); //$NON-NLS-1$

            setDigest( createApplicationHash(isApp, isPi ) );
        } finally {
            Util.close(isApp,Statics.APP_DISCRIPTOR);
            Util.close(isPi,Statics.APP_DISCRIPTOR);
        }
    }

    /**
     * @return XMAApp xma application descriptor
     */
    public static XMAApp getXmaapp() {
        return xmaapp;
    }

    /**
     * @param app xma application descriptor
     */
    private static void setXmaapp(XMAApp app) {
        xmaapp = app;
    }

    /**
     * @return application digest (hash code)
     */
    public static byte[] getDigest() {
        return digest_;
    }

    /**
     * @param bs set application digest
     */
    private static void setDigest(byte[] bs) {
        digest_ = bs;
    }

}