/*

 * 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.xml.internal.bind.marshaller;

import java.io.IOException;

import java.io.Writer;

/**

 * Performs no character escaping. Usable only when the output encoding

 * is UTF, but this handler gives the maximum performance.

 *

 * @author

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

 */

public class MinimumEscapeHandler implements CharacterEscapeHandler {

    private MinimumEscapeHandler() {}  // no instanciation please

    public static final CharacterEscapeHandler theInstance = new MinimumEscapeHandler();

    public void escape(char[] ch, int start, int length, boolean isAttVal, Writer out) throws IOException {

        // avoid calling the Writerwrite method too much by assuming

        // that the escaping occurs rarely.

        // profiling revealed that this is faster than the naive code.

        int limit = start+length;

        for (int i = start; i < limit; i++) {

            char c = ch[i];

                if(c == '&' || c == '<' || c == '>' || c == '\r' || (c == '\"' && isAttVal) ) {

                if(i!=start)

                    out.write(ch,start,i-start);

                start = i+1;

                switch (ch[i]) {

                    case '&':

                        out.write("&");

                        break;

                    case '<':

                        out.write("<");

                        break;

                    case '>':

                        out.write(">");

                        break;

                    case '\"':

                        out.write(""");

                        break;

                }

            }

        }

        if( start!=limit )

            out.write(ch,start,limit-start);

    }

}