/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.tools.ant.taskdefs.cvslib;

import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Iterator;

/**
 * Class used to generate an XML changelog.
 *
 * @author <a href="mailto:peter@apache.org">Peter Donald</a>
 * @version $Revision$ $Date$
 */
class ChangeLogWriter
{
    /** output format for dates writtn to xml file */
    private static final SimpleDateFormat c_outputDate = new SimpleDateFormat( "yyyy-MM-dd" );
    /** output format for times writtn to xml file */
    private static final SimpleDateFormat c_outputTime = new SimpleDateFormat( "hh:mm" );

    /**
     * Print out the specifed entrys.
     */
    public void printChangeLog( final PrintWriter output,
                                final CVSEntry[] entries )
    {
        output.println( "<changelog>" );
        for( int i = 0; i < entries.length; i++ )
        {
            final CVSEntry entry = entries[ i ];
            printEntry( output, entry );
        }
        output.println( "</changelog>" );
        output.flush();
        output.close();
    }

    /**
     * Print out an individual entry in changelog.
     *
     * @param entry the entry to print
     */
    private void printEntry( final PrintWriter output, final CVSEntry entry )
    {
        output.println( "\t<entry>" );
        output.println( "\t\t<date>" + c_outputDate.format( entry.getDate() ) + "</date>" );
        output.println( "\t\t<time>" + c_outputTime.format( entry.getDate() ) + "</time>" );
        output.println( "\t\t<author>" + entry.getAuthor() + "</author>" );

        final Iterator iterator = entry.getFiles().iterator();
        while( iterator.hasNext() )
        {
            final RCSFile file = (RCSFile)iterator.next();
            output.println( "\t\t<file>" );
            output.println( "\t\t\t<name>" + file.getName() + "</name>" );
            output.println( "\t\t\t<revision>" + file.getRevision() + "</revision>" );

            final String previousRevision = file.getPreviousRevision();
            if( previousRevision != null )
            {
                output.println( "\t\t\t<prevrevision>" + previousRevision + "</prevrevision>" );
            }

            output.println( "\t\t</file>" );
        }
        output.println( "\t\t<msg>" + entry.getComment() + "</msg>" );
        output.println( "\t</entry>" );
    }
}
