modello-plugin-store/src/main/java/org/codehaus/modello/plugin/store/StoreModelloGenerator.java

package org.codehaus.modello.plugin.store;

/*
 * Copyright (c) 2005, Codehaus.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import org.apache.velocity.VelocityContext;
import org.apache.velocity.context.Context;
import org.codehaus.modello.ModelloException;
import org.codehaus.modello.model.Model;
import org.codehaus.modello.plugin.AbstractModelloGenerator;
import org.codehaus.modello.plugin.store.metadata.StoreClassMetadata;
import org.codehaus.plexus.util.WriterFactory;
import org.codehaus.plexus.velocity.VelocityComponent;

import java.io.File;
import java.io.Writer;
import java.util.Properties;

/**
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 * @version $Id: StoreModelloGenerator.java 895 2008-05-24 22:31:50Z hboutemy $
 */
public class StoreModelloGenerator
    extends AbstractModelloGenerator
{
    /** @requirement */
    private VelocityComponent velocity;

    public void generate( Model model, Properties properties )
        throws ModelloException
    {
        initialize( model, properties );


        // ----------------------------------------------------------------------
        // Initialize the Velocity context
        // ----------------------------------------------------------------------

        Context context = new VelocityContext();

        context.put( "version", getGeneratedVersion() );

        context.put( "package", model.getDefaultPackageName( false, getGeneratedVersion() ) );

        context.put( "metadataId", StoreClassMetadata.ID );

        context.put( "model", model );

        // ----------------------------------------------------------------------
        // Generate the code
        // ----------------------------------------------------------------------

        String packageName = model.getDefaultPackageName( false, getGeneratedVersion() );

        File packageFile = new File( getOutputDirectory(), packageName.replace( '.', File.separatorChar ) );

        File interfaceFile = new File( packageFile, model.getName() + "Store.java" );

        File exceptionFile = new File( packageFile, model.getName() + "StoreException.java" );

        if ( !interfaceFile.getParentFile().exists() )
        {
            if ( !interfaceFile.getParentFile().mkdirs() )
            {
                throw new ModelloException( "Error while creating parent directories for '" + interfaceFile.getAbsolutePath() + "'." );
            }
        }

        String interfaceTemplate = "org/codehaus/modello/plugin/store/templates/Store.vm";

        String exceptionTemplate = "org/codehaus/modello/plugin/store/templates/StoreException.vm";

        writeTemplate( interfaceTemplate, interfaceFile, context );

        writeTemplate( exceptionTemplate, exceptionFile, context );
    }

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    private void writeTemplate( String template, File file, Context context )
        throws ModelloException
    {
        try
        {
            Writer writer = getEncoding() == null ? WriterFactory.newPlatformWriter( file )
                                : WriterFactory.newWriter( file, getEncoding() );

            velocity.getEngine().mergeTemplate( template, context, writer );

            writer.flush();

            writer.close();
        }
        catch ( Exception e )
        {
            throw new ModelloException( "Error while generating code.", e );
        }
    }
}