1 /* ParserDelegator.java -- Delegator for ParserDocument. 2 Copyright (C) 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package javax.swing.text.html.parser; 39 40 import gnu.javax.swing.text.html.parser.HTML_401F; 41 42 import java.io.IOException; 43 import java.io.Reader; 44 import java.io.Serializable; 45 46 import javax.swing.text.BadLocationException; 47 import javax.swing.text.SimpleAttributeSet; 48 import javax.swing.text.html.HTMLEditorKit; 49 import javax.swing.text.html.HTMLEditorKit.ParserCallback; 50 51 /** 52 * This class instantiates and starts the working instance of 53 * html parser, being responsible for providing the default DTD. 54 * 55 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 56 */ 57 public class ParserDelegator 58 extends javax.swing.text.html.HTMLEditorKit.Parser 59 implements Serializable 60 { 61 private class gnuParser 62 extends gnu.javax.swing.text.html.parser.support.Parser 63 { 64 private static final long serialVersionUID = 1; 65 gnuParser(DTD d)66 private gnuParser(DTD d) 67 { 68 super(d); 69 } 70 handleComment(char[] comment)71 protected final void handleComment(char[] comment) 72 { 73 callBack.handleComment(comment, hTag.where.startPosition); 74 } 75 handleEmptyTag(TagElement tag)76 protected final void handleEmptyTag(TagElement tag) 77 throws javax.swing.text.ChangedCharSetException 78 { 79 callBack.handleSimpleTag(tag.getHTMLTag(), getAttributes(), 80 hTag.where.startPosition 81 ); 82 } 83 handleEndTag(TagElement tag)84 protected final void handleEndTag(TagElement tag) 85 { 86 callBack.handleEndTag(tag.getHTMLTag(), hTag.where.startPosition); 87 } 88 handleError(int line, String message)89 protected final void handleError(int line, String message) 90 { 91 callBack.handleError(message, hTag.where.startPosition); 92 } 93 handleStartTag(TagElement tag)94 protected final void handleStartTag(TagElement tag) 95 { 96 SimpleAttributeSet attributes = gnu.getAttributes(); 97 98 if (tag.fictional()) 99 attributes.addAttribute(ParserCallback.IMPLIED, Boolean.TRUE); 100 101 callBack.handleStartTag(tag.getHTMLTag(), attributes, 102 hTag.where.startPosition 103 ); 104 } 105 handleText(char[] text)106 protected final void handleText(char[] text) 107 { 108 callBack.handleText(text, hTag.where.startPosition); 109 } 110 getDTD()111 DTD getDTD() 112 { 113 // Accessing the inherited gnu.javax.swing.text.html.parser.support.Parser 114 // field. super. is a workaround, required to support JDK1.3's javac. 115 return super.dtd; 116 } 117 } 118 119 /** 120 * Use serialVersionUID for interoperability. 121 */ 122 private static final long serialVersionUID = -1276686502624777206L; 123 124 private static DTD dtd = HTML_401F.getInstance(); 125 126 /** 127 * The callback. 128 * This is package-private to avoid an accessor method. 129 */ 130 HTMLEditorKit.ParserCallback callBack; 131 132 /** 133 * The reference to the working class of HTML parser that is 134 * actually used to parse the document. 135 * This is package-private to avoid an accessor method. 136 */ 137 gnuParser gnu; 138 139 /** 140 * Parses the HTML document, calling methods of the provided 141 * callback. This method must be multithread - safe. 142 * @param reader The reader to read the HTML document from 143 * @param a_callback The callback that is notifyed about the presence 144 * of HTML elements in the document. 145 * @param ignoreCharSet If thrue, any charset changes during parsing 146 * are ignored. 147 * @throws java.io.IOException 148 */ parse(Reader reader, HTMLEditorKit.ParserCallback a_callback, boolean ignoreCharSet )149 public void parse(Reader reader, HTMLEditorKit.ParserCallback a_callback, 150 boolean ignoreCharSet 151 ) 152 throws IOException 153 { 154 callBack = a_callback; 155 156 if (gnu == null || !dtd.equals(gnu.getDTD())) 157 { 158 gnu = new gnuParser(dtd); 159 } 160 161 gnu.parse(reader); 162 163 callBack.handleEndOfLineString(gnu.getEndOfLineSequence()); 164 try 165 { 166 callBack.flush(); 167 } 168 catch (BadLocationException ex) 169 { 170 // Convert this into the supported type of exception. 171 throw new IOException(ex.getMessage()); 172 } 173 } 174 175 /** 176 * Calling this method instructs that, if not specified directly, 177 * the documents will be parsed using the default 178 * DTD of the implementation. 179 */ setDefaultDTD()180 protected static void setDefaultDTD() 181 { 182 dtd = HTML_401F.getInstance(); 183 } 184 185 /** 186 * Registers the user - written DTD under the given name, also 187 * making it default for the subsequent parsings. This has effect on 188 * all subsequent calls to the parse(...) . If you need to specify 189 * your DTD locally, simply {@link javax.swing.text.html.parser.Parser} 190 * instead. 191 * @param a_dtd The DTD that will be used to parse documents by this class. 192 * @param name The name of this DTD. 193 * @return No standard is specified on which instance of DTD must be 194 * returned by this method, and it is recommended to leave the returned 195 * value without consideration. This implementation returns the DTD 196 * that was previously set as the default DTD, or the implementations 197 * default DTD if none was set. 198 */ createDTD(DTD a_dtd, String name)199 protected static DTD createDTD(DTD a_dtd, String name) 200 { 201 DTD.putDTDHash(name, a_dtd); 202 203 DTD dtd_prev = dtd; 204 dtd = a_dtd; 205 return dtd_prev; 206 } 207 } 208