/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 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://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or 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 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.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 '&lt;' and '&amp;'.
 *
 * <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() );
    }

}
