1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.bind.marshaller;
  27 
  28 import java.io.IOException;
  29 import java.io.Writer;
  30 
  31 /**
  32  * Performs no character escaping. Usable only when the output encoding
  33  * is UTF, but this handler gives the maximum performance.
  34  *
  35  * @author
  36  *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
  37  */
  38 public class MinimumEscapeHandler implements CharacterEscapeHandler {
  39 
  40     private MinimumEscapeHandler() {}  // no instanciation please
  41 
  42     public static final CharacterEscapeHandler theInstance = new MinimumEscapeHandler();
  43 
  44     public void escape(char[] ch, int start, int length, boolean isAttVal, Writer out) throws IOException {
  45         // avoid calling the Writerwrite method too much by assuming
  46         // that the escaping occurs rarely.
  47         // profiling revealed that this is faster than the naive code.
  48         int limit = start+length;
  49         for (int i = start; i < limit; i++) {
  50             char c = ch[i];
  51                 if(c == '&' || c == '<' || c == '>' || c == '\r' || (c == '\"' && isAttVal) ) {
  52                 if(i!=start)
  53                     out.write(ch,start,i-start);
  54                 start = i+1;
  55                 switch (ch[i]) {
  56                     case '&':
  57                         out.write("&amp;");
  58                         break;
  59                     case '<':
  60                         out.write("&lt;");
  61                         break;
  62                     case '>':
  63                         out.write("&gt;");
  64                         break;
  65                     case '\"':
  66                         out.write("&quot;");
  67                         break;
  68                 }
  69             }
  70         }
  71 
  72         if( start!=limit )
  73             out.write(ch,start,limit-start);
  74     }
  75 
  76 }