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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
 * Modifications:
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 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 */

package com.sun.xml.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 ([email protected])
 */
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);
    }

}