/*

 * 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 non US-ASCII characters into

 * Java Unicode escape \\uXXXX.

 *

 * This process is necessary if the method names or field names

 * contain non US-ASCII characters.

 *

 * @author

 *      Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

 */

public class UnicodeEscapeWriter extends FilterWriter {

    public UnicodeEscapeWriter( Writer next ) {

        super(next);

    }

    public final void write(int ch) throws IOException {

        if(!requireEscaping(ch))  out.write(ch);

        else {

            // need to escape

            out.write("\\u");

            String s = Integer.toHexString(ch);

            for( int i=s.length(); i<4; i++ )

                out.write('0');

            out.write(s);

        }

    }

    /**

     * Can be overrided. Return true if the character

     * needs to be escaped.

     */

    protected boolean requireEscaping(int ch) {

        if(ch>=128)     return true;

        // control characters

        if( ch<0x20 && " \t\r\n".indexOf(ch)==-1 )  return true;

        return false;

    }

    public final void write(char[] buf, int off, int len) throws IOException {

        for( int i=0; i<len; i++ )

            write(buf[off+i]);

    }

    public final void write(char[] buf) throws IOException {

        write(buf,0,buf.length);

    }

    public final void write(String buf, int off, int len) throws IOException {

        write( buf.toCharArray(), off, len );

    }

    public final void write(String buf) throws IOException {

        write( buf.toCharArray(), 0, buf.length() );

    }

}