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1: /* GnuParserDelegator.java -- The parser delegator which uses Swing DTD 2: Copyright (C) 2006 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: 39: package gnu.javax.swing.text.html.parser; 40: 41: import java.io.IOException; 42: import java.io.Reader; 43: import java.io.Serializable; 44: 45: import javax.swing.text.BadLocationException; 46: import javax.swing.text.SimpleAttributeSet; 47: import javax.swing.text.html.HTMLEditorKit; 48: import javax.swing.text.html.HTMLEditorKit.ParserCallback; 49: import javax.swing.text.html.parser.DTD; 50: import javax.swing.text.html.parser.ParserDelegator; 51: import javax.swing.text.html.parser.TagElement; 52: 53: /** 54: * This parser delegator uses the different DTD ({@link HTML_401Swing}). 55: * It is derived from the ParserDelegator for the compatibility reasons. 56: * 57: * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 58: */ 59: public class GnuParserDelegator extends ParserDelegator implements Serializable 60: { 61: class gnuParser 62: extends gnu.javax.swing.text.html.parser.support.Parser 63: { 64: private static final long serialVersionUID = 1; 65: 66: gnuParser(DTD d) 67: { 68: super(d); 69: } 70: 71: protected final void handleComment(char[] comment) 72: { 73: callBack.handleComment(comment, hTag.where.startPosition); 74: } 75: 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: 84: protected final void handleEndTag(TagElement tag) 85: { 86: callBack.handleEndTag(tag.getHTMLTag(), hTag.where.startPosition); 87: } 88: 89: protected final void handleError(int line, String message) 90: { 91: callBack.handleError(message, hTag.where.startPosition); 92: } 93: 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: 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 DTD theDtd; 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: * Create the parser that uses the given DTD to parse the document. 141: * 142: * @param theDtd the DTD 143: */ 144: public GnuParserDelegator(DTD theDtd) 145: { 146: this.theDtd = theDtd; 147: gnu = new gnuParser(theDtd); 148: } 149: 150: /** 151: * Parses the HTML document, calling methods of the provided callback. This 152: * method must be multithread - safe. 153: * 154: * @param reader The reader to read the HTML document from 155: * @param a_callback The callback that is notifyed about the presence of HTML 156: * elements in the document. 157: * @param ignoreCharSet If thrue, any charset changes during parsing are 158: * ignored. 159: * @throws java.io.IOException 160: */ 161: public void parse(Reader reader, 162: HTMLEditorKit.ParserCallback a_callback, 163: boolean ignoreCharSet) throws IOException 164: { 165: callBack = a_callback; 166: gnu.parse(reader); 167: 168: callBack.handleEndOfLineString(gnu.getEndOfLineSequence()); 169: try 170: { 171: callBack.flush(); 172: } 173: catch (BadLocationException ex) 174: { 175: // Convert this into the supported type of exception. 176: throw new IOException(ex.getMessage()); 177: } 178: } 179: }