001/* ParserDelegator.java -- Delegator for ParserDocument. 002 Copyright (C) 2005 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.swing.text.html.parser; 039 040import gnu.javax.swing.text.html.parser.HTML_401F; 041 042import java.io.IOException; 043import java.io.Reader; 044import java.io.Serializable; 045 046import javax.swing.text.BadLocationException; 047import javax.swing.text.SimpleAttributeSet; 048import javax.swing.text.html.HTMLEditorKit; 049import javax.swing.text.html.HTMLEditorKit.ParserCallback; 050 051/** 052 * This class instantiates and starts the working instance of 053 * html parser, being responsible for providing the default DTD. 054 * 055 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 056 */ 057public class ParserDelegator 058 extends javax.swing.text.html.HTMLEditorKit.Parser 059 implements Serializable 060{ 061 private class gnuParser 062 extends gnu.javax.swing.text.html.parser.support.Parser 063 { 064 private static final long serialVersionUID = 1; 065 066 private gnuParser(DTD d) 067 { 068 super(d); 069 } 070 071 protected final void handleComment(char[] comment) 072 { 073 callBack.handleComment(comment, hTag.where.startPosition); 074 } 075 076 protected final void handleEmptyTag(TagElement tag) 077 throws javax.swing.text.ChangedCharSetException 078 { 079 callBack.handleSimpleTag(tag.getHTMLTag(), getAttributes(), 080 hTag.where.startPosition 081 ); 082 } 083 084 protected final void handleEndTag(TagElement tag) 085 { 086 callBack.handleEndTag(tag.getHTMLTag(), hTag.where.startPosition); 087 } 088 089 protected final void handleError(int line, String message) 090 { 091 callBack.handleError(message, hTag.where.startPosition); 092 } 093 094 protected final void handleStartTag(TagElement tag) 095 { 096 SimpleAttributeSet attributes = gnu.getAttributes(); 097 098 if (tag.fictional()) 099 attributes.addAttribute(ParserCallback.IMPLIED, Boolean.TRUE); 100 101 callBack.handleStartTag(tag.getHTMLTag(), attributes, 102 hTag.where.startPosition 103 ); 104 } 105 106 protected final void handleText(char[] text) 107 { 108 callBack.handleText(text, hTag.where.startPosition); 109 } 110 111 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 */ 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 */ 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 */ 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}