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1 /*--
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2
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3 $Id: AbstractDOMAdapter.java,v 1.21 2007/11/10 05:28:59 jhunter Exp $
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4
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5 Copyright (C) 2000-2007 Jason Hunter & Brett McLaughlin.
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6 All rights reserved.
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7
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8 Redistribution and use in source and binary forms, with or without
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9 modification, are permitted provided that the following conditions
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10 are met:
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11
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12 1. Redistributions of source code must retain the above copyright
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13 notice, this list of conditions, and the following disclaimer.
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14
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15 2. Redistributions in binary form must reproduce the above copyright
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16 notice, this list of conditions, and the disclaimer that follows
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17 these conditions in the documentation and/or other materials
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18 provided with the distribution.
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19
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20 3. The name "JDOM" must not be used to endorse or promote products
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21 derived from this software without prior written permission. For
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22 written permission, please contact <request_AT_jdom_DOT_org>.
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23
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24 4. Products derived from this software may not be called "JDOM", nor
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25 may "JDOM" appear in their name, without prior written permission
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26 from the JDOM Project Management <request_AT_jdom_DOT_org>.
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27
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28 In addition, we request (but do not require) that you include in the
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29 end-user documentation provided with the redistribution and/or in the
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30 software itself an acknowledgement equivalent to the following:
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31 "This product includes software developed by the
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32 JDOM Project (http://www.jdom.org/)."
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33 Alternatively, the acknowledgment may be graphical using the logos
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34 available at http://www.jdom.org/images/logos.
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35
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36 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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37 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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38 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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39 DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
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40 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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41 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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42 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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43 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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44 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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45 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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46 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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47 SUCH DAMAGE.
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48
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49 This software consists of voluntary contributions made by many
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50 individuals on behalf of the JDOM Project and was originally
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51 created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
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52 Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
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53 on the JDOM Project, please see <http://www.jdom.org/>.
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54
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55 */
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56
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57 package org.jdom.adapters;
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58
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59 import java.io.*;
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60 import java.lang.reflect.*;
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61
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62 import org.jdom.*;
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63 import org.w3c.dom.*;
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64 import org.w3c.dom.Document;
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65
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66 /**
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67 * A DOMAdapter utility abstract base class.
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68 *
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69 * @version $Revision: 1.21 $, $Date: 2007/11/10 05:28:59 $
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70 * @author Brett McLaughlin
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71 * @author Jason Hunter
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72 */
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73 public abstract class AbstractDOMAdapter implements DOMAdapter {
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74
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75 private static final String CVS_ID =
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76 "@(#) $RCSfile: AbstractDOMAdapter.java,v $ $Revision: 1.21 $ $Date: 2007/11/10 05:28:59 $ $Name: jdom_1_1_1 $";
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77
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78 /**
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79 * This creates a new <code>{@link Document}</code> from an
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80 * existing <code>InputStream</code> by letting a DOM
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81 * parser handle parsing using the supplied stream.
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82 *
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83 * @param filename file to parse.
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84 * @param validate <code>boolean</code> to indicate if validation should occur.
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85 * @return <code>Document</code> - instance ready for use.
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86 * @throws IOException when I/O error occurs.
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87 * @throws JDOMException when errors occur in parsing.
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88 */
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89 public Document getDocument(File filename, boolean validate)
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90 throws IOException, JDOMException {
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91
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92 return getDocument(new FileInputStream(filename), validate);
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93 }
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94
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95 /**
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96 * This creates a new <code>{@link Document}</code> from an
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97 * existing <code>InputStream</code> by letting a DOM
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98 * parser handle parsing using the supplied stream.
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99 *
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100 * @param in <code>InputStream</code> to parse.
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101 * @param validate <code>boolean</code> to indicate if validation should occur.
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102 * @return <code>Document</code> - instance ready for use.
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103 * @throws IOException when I/O error occurs.
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104 * @throws JDOMException when errors occur in parsing.
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105 */
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106 public abstract Document getDocument(InputStream in, boolean validate)
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107 throws IOException, JDOMException;
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108
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109 /**
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110 * This creates an empty <code>Document</code> object based
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111 * on a specific parser implementation.
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112 *
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113 * @return <code>Document</code> - created DOM Document.
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114 * @throws JDOMException when errors occur.
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115 */
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116 public abstract Document createDocument() throws JDOMException;
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117
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118 /**
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119 * This creates an empty <code>Document</code> object based
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120 * on a specific parser implementation with the given DOCTYPE.
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121 * If the doctype parameter is null, the behavior is the same as
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122 * calling <code>createDocument()</code>.
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123 *
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124 * @param doctype Initial <code>DocType</code> of the document.
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125 * @return <code>Document</code> - created DOM Document.
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126 * @throws JDOMException when errors occur.
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127 */
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128 public Document createDocument(DocType doctype) throws JDOMException {
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129 if (doctype == null) {
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130 return createDocument();
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131 }
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132
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133 DOMImplementation domImpl = createDocument().getImplementation();
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134 DocumentType domDocType = domImpl.createDocumentType(
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135 doctype.getElementName(),
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136 doctype.getPublicID(),
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137 doctype.getSystemID());
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138
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139 // Set the internal subset if possible
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140 setInternalSubset(domDocType, doctype.getInternalSubset());
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141
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142 return domImpl.createDocument("http://temporary",
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143 doctype.getElementName(),
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144 domDocType);
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145 }
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146
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147 /**
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148 * This attempts to change the DocumentType to have the given internal DTD
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149 * subset value. This is not a standard ability in DOM, so it's only
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150 * available with some parsers. Subclasses can alter the mechanism by
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151 * which the attempt is made to set the value.
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152 *
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153 * @param dt DocumentType to be altered
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154 * @param s String to use as the internal DTD subset
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155 */
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156 protected void setInternalSubset(DocumentType dt, String s) {
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157 if (dt == null || s == null) return;
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158
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159 // Default behavior is to attempt a setInternalSubset() call using
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160 // reflection. This method is not part of the DOM spec, but it's
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161 // available on Xerces 1.4.4+. It's not currently in Crimson.
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162 try {
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163 Class dtclass = dt.getClass();
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164 Method setInternalSubset = dtclass.getMethod(
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165 "setInternalSubset", new Class[] {java.lang.String.class});
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166 setInternalSubset.invoke(dt, new Object[] {s});
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167 }
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168 catch (Exception e) {
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169 // ignore
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170 }
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171 }
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172 }
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