/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.codemodel.writer;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import com.sun.codemodel.CodeWriter;
import com.sun.codemodel.JPackage;

/**
 * Writes all the source files under the specified file folder and 
 * inserts a file prolog comment in each java source file.
 * 
 * @author
 *  Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class PrologCodeWriter extends FilterCodeWriter {
    
    /** prolog comment */
    private final String prolog;
    
    /**
     * @param core
     *      This CodeWriter will be used to actually create a storage for files.
     *      PrologCodeWriter simply decorates this underlying CodeWriter by
     *      adding prolog comments.
     * @param prolog
     *      Strings that will be added as comments.
     *      This string may contain newlines to produce multi-line comments.
     *      '//' will be inserted at the beginning of each line to make it
     *      a valid Java comment, so the caller can just pass strings like
     *      "abc\ndef" 
     */
    public PrologCodeWriter( CodeWriter core, String prolog ) {
        super(core);
        this.prolog = prolog;
    }
    
    
    @Override
    public Writer openSource(JPackage pkg, String fileName) throws IOException {
        Writer w = super.openSource(pkg,fileName);
        
        PrintWriter out = new PrintWriter(w);
        
        // write prolog if this is a java source file
        if( prolog != null ) {
            out.println( "//" );
            
            String s = prolog;
            int idx;
            while( (idx=s.indexOf('\n'))!=-1 ) {
                out.println("// "+ s.substring(0,idx) );
                s = s.substring(idx+1);
            }
            out.println("//");
            out.println();
        }
        out.flush();    // we can't close the stream for that would close the undelying stream.
        
        return w;
    }
}