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org.apache.commons.jelly.util.SafeContentHandler |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jelly.util; |
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17 | ||
18 | import org.xml.sax.Attributes; |
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19 | import org.xml.sax.ContentHandler; |
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20 | import org.xml.sax.Locator; |
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21 | import org.xml.sax.SAXException; |
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22 | ||
23 | /** |
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24 | * Ensures that only one start and end document event is passed onto the underlying |
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25 | * ContentHandler. This object can only be used once and then discarded. |
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26 | * |
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27 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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28 | */ |
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29 | public class SafeContentHandler implements ContentHandler { |
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30 | private ContentHandler handler; |
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31 | private boolean documentStarted; |
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32 | private boolean documentEnded; |
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33 | ||
34 | 6 | public SafeContentHandler(ContentHandler handler) { |
35 | 6 | this.handler = handler; |
36 | 6 | } |
37 | ||
38 | /** |
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39 | * @throws org.xml.sax.SAXException |
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40 | */ |
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41 | public void startDocument() throws SAXException { |
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42 | 6 | if (! documentStarted) { |
43 | 6 | handler.startDocument(); |
44 | 6 | documentStarted = true; |
45 | } |
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46 | 6 | } |
47 | ||
48 | /** |
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49 | * @throws org.xml.sax.SAXException |
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50 | */ |
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51 | public void endDocument() throws SAXException { |
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52 | 6 | if (! documentEnded) { |
53 | 6 | handler.endDocument(); |
54 | 6 | documentEnded = true; |
55 | } |
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56 | 6 | } |
57 | ||
58 | /** |
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59 | * @param arg0 |
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60 | * @param arg1 |
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61 | * @param arg2 |
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62 | * @throws org.xml.sax.SAXException |
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63 | */ |
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64 | public void characters(char[] arg0, int arg1, class="keyword">int arg2) |
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65 | throws SAXException { |
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66 | 6 | handler.characters(arg0, arg1, arg2); |
67 | 6 | } |
68 | ||
69 | /** |
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70 | * @param arg0 |
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71 | * @param arg1 |
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72 | * @param arg2 |
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73 | * @throws org.xml.sax.SAXException |
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74 | */ |
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75 | public void endElement(String arg0, String arg1, String arg2) |
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76 | throws SAXException { |
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77 | 6 | handler.endElement(arg0, arg1, arg2); |
78 | 6 | } |
79 | ||
80 | /** |
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81 | * @param arg0 |
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82 | * @throws org.xml.sax.SAXException |
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83 | */ |
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84 | public void endPrefixMapping(String arg0) throws SAXException { |
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85 | 2 | handler.endPrefixMapping(arg0); |
86 | 2 | } |
87 | ||
88 | /** |
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89 | * @param arg0 |
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90 | * @param arg1 |
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91 | * @param arg2 |
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92 | * @throws org.xml.sax.SAXException |
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93 | */ |
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94 | public void ignorableWhitespace(char[] arg0, int arg1, class="keyword">int arg2) |
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95 | throws SAXException { |
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96 | 0 | handler.ignorableWhitespace(arg0, arg1, arg2); |
97 | 0 | } |
98 | ||
99 | /** |
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100 | * @param arg0 |
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101 | * @param arg1 |
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102 | * @throws org.xml.sax.SAXException |
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103 | */ |
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104 | public void processingInstruction(String arg0, String arg1) |
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105 | throws SAXException { |
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106 | 0 | handler.processingInstruction(arg0, arg1); |
107 | 0 | } |
108 | ||
109 | /** |
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110 | * @param arg0 |
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111 | */ |
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112 | public void setDocumentLocator(Locator arg0) { |
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113 | 0 | handler.setDocumentLocator(arg0); |
114 | 0 | } |
115 | ||
116 | /** |
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117 | * @param arg0 |
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118 | * @throws org.xml.sax.SAXException |
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119 | */ |
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120 | public void skippedEntity(String arg0) throws SAXException { |
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121 | 0 | handler.skippedEntity(arg0); |
122 | 0 | } |
123 | ||
124 | /** |
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125 | * @param arg0 |
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126 | * @param arg1 |
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127 | * @param arg2 |
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128 | * @param arg3 |
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129 | * @throws org.xml.sax.SAXException |
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130 | */ |
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131 | public void startElement( |
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132 | String arg0, |
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133 | String arg1, |
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134 | String arg2, |
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135 | Attributes arg3) |
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136 | throws SAXException { |
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137 | 6 | handler.startElement(arg0, arg1, arg2, arg3); |
138 | 6 | } |
139 | ||
140 | /** |
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141 | * @param arg0 |
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142 | * @param arg1 |
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143 | * @throws org.xml.sax.SAXException |
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144 | */ |
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145 | public void startPrefixMapping(String arg0, String arg1) |
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146 | throws SAXException { |
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147 | 2 | handler.startPrefixMapping(arg0, arg1); |
148 | 2 | } |
149 | } |
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