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1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.xml.internal.bind.v2.util; |
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27 |
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28 import java.io.IOException; |
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29 import java.io.InputStream; |
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30 import java.io.InputStreamReader; |
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31 import java.io.Reader; |
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32 |
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33 import javax.activation.DataHandler; |
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34 import javax.activation.DataSource; |
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35 import javax.activation.MimeType; |
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36 import javax.activation.MimeTypeParseException; |
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37 import javax.xml.transform.Source; |
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38 import javax.xml.transform.stream.StreamSource; |
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39 |
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40 /** |
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41 * {@link Source} implementation backed by {@link DataHandler}. |
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42 * |
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43 * <p> |
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44 * This implementation allows the same {@link Source} to be used |
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45 * mutliple times. |
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46 * |
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47 * <p> |
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48 * {@link Source} isn't really pluggable. As a consequence, |
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49 * this implementation is clunky --- weak against unexpected |
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50 * usage of the class. |
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51 * |
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52 * @author Kohsuke Kawaguchi |
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53 */ |
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54 public final class DataSourceSource extends StreamSource { |
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55 private final DataSource source; |
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56 |
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57 /** |
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58 * If null, default to the encoding declaration |
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59 */ |
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60 private final String charset; |
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61 |
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62 // remember the value we returned so that the 2nd invocation |
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63 // will return the same object, which is what's expeted out of |
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64 // StreamSource |
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65 private Reader r; |
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66 private InputStream is; |
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67 |
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68 public DataSourceSource(DataHandler dh) throws MimeTypeParseException { |
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69 this(dh.getDataSource()); |
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70 } |
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71 |
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72 public DataSourceSource(DataSource source) throws MimeTypeParseException { |
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73 this.source = source; |
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74 |
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75 String ct = source.getContentType(); |
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76 if(ct==null) { |
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77 charset = null; |
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78 } else { |
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79 MimeType mimeType = new MimeType(ct); |
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80 this.charset = mimeType.getParameter("charset"); |
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81 } |
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82 } |
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83 |
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84 @Override |
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85 public void setReader(Reader reader) { |
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86 throw new UnsupportedOperationException(); |
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87 } |
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88 |
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89 @Override |
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90 public void setInputStream(InputStream inputStream) { |
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91 throw new UnsupportedOperationException(); |
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92 } |
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93 |
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94 @Override |
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95 public Reader getReader() { |
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96 try { |
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97 if(charset==null) return null; |
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98 if(r==null) |
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99 r = new InputStreamReader(source.getInputStream(),charset); |
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100 return r; |
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101 } catch (IOException e) { |
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102 // argh |
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103 throw new RuntimeException(e); |
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104 } |
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105 } |
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106 |
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107 @Override |
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108 public InputStream getInputStream() { |
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109 try { |
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110 if(charset!=null) return null; |
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111 if(is==null) |
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112 is = source.getInputStream(); |
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113 return is; |
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114 } catch (IOException e) { |
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115 // argh |
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116 throw new RuntimeException(e); |
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117 } |
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118 } |
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119 |
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120 public DataSource getDataSource() { |
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121 return source; |
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122 } |
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123 } |