/*

 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package com.sun.codemodel.internal.writer;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.Writer;

import com.sun.codemodel.internal.CodeWriter;

import com.sun.codemodel.internal.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;

    }

}