/*
 * Copyright (c) 1997, 2017, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.codemodel.internal.util;

import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;

/**
 * {@link Writer} that escapes characters that are unsafe
 * as Javadoc comments.
 *
 * Such characters include '<' and '&'.
 *
 * <p>
 * Note that this class doesn't escape other Unicode characters
 * that are typically unsafe. For example, {@literal &#x611B;} (A kanji
 * that means "love") can be considered as unsafe because
 * javac with English Windows cannot accept this character in the
 * source code.
 *
 * <p>
 * If the application needs to escape such characters as well, then
 * they are on their own.
 *
 * @author
 *      Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class JavadocEscapeWriter extends FilterWriter {

    public JavadocEscapeWriter( Writer next ) {
        super(next);
    }

    public void write(int ch) throws IOException {
        if(ch=='<')
            out.write("&lt;");
        else
        if(ch=='&')
            out.write("&amp;");
        else
        if(ch=='>')
            out.write("&gt;");
        else
            out.write(ch);
    }

    public void write(char[] buf, int off, int len) throws IOException {
        for( int i=0; i<len; i++ )
            write(buf[off+i]);
    }

    public void write(char[] buf) throws IOException {
        write(buf,0,buf.length);
    }

    public void write(String buf, int off, int len) throws IOException {
        write( buf.toCharArray(), off, len );
    }

    public void write(String buf) throws IOException {
        write( buf.toCharArray(), 0, buf.length() );
    }

}