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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * -------------------- 28: * ListReadHandler.java 29: * -------------------- 30: * (C)opyright 2003, 2004, by Thomas Morgner and Contributors. 31: * 32: * Original Author: Thomas Morgner; 33: * Contributor(s): David Gilbert (for Object Refinery Limited); 34: * 35: * $Id: ListReadHandler.java,v 1.3 2005/10/18 13:33:32 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 12-Nov-2003 : Initial version (TM); 40: * 41: */ 42: 43: package org.jfree.xml.parser.coretypes; 44: 45: import java.util.ArrayList; 46: import java.util.LinkedList; 47: import java.util.List; 48: import java.util.Stack; 49: import java.util.Vector; 50: 51: import org.jfree.xml.parser.AbstractXmlReadHandler; 52: import org.jfree.xml.parser.XmlReadHandler; 53: import org.jfree.xml.parser.XmlReaderException; 54: import org.xml.sax.Attributes; 55: import org.xml.sax.SAXException; 56: 57: /** 58: * A SAX handler for reading a list from an XML element. 59: */ 60: public class ListReadHandler extends AbstractXmlReadHandler { 61: 62: /** The list under construction. */ 63: private List retval; 64: 65: /** The handlers. */ 66: private ArrayList handlers; 67: 68: /** The type of list ('array-list', 'linked-list', 'stack', 'vector'). */ 69: private String listType; 70: 71: /** 72: * Default constructor. 73: */ 74: public ListReadHandler() { 75: super(); 76: } 77: 78: /** 79: * Start parsing. 80: * 81: * @param attrs the attributes. 82: * 83: * @throws SAXException if there is a parsing error. 84: */ 85: protected void startParsing(final Attributes attrs) throws SAXException { 86: this.listType = attrs.getValue("type"); 87: if (this.listType == null) { 88: this.listType = "array-list"; 89: } 90: this.handlers = new ArrayList(); 91: } 92: 93: /** 94: * Gets a handler for a child. 95: * 96: * @param tagName the tag name. 97: * @param atts the attributes. 98: * 99: * @return A handler. 100: * 101: * @throws XmlReaderException if there is a problem with the reader. 102: * @throws SAXException if there is a parsing error. 103: */ 104: protected XmlReadHandler getHandlerForChild(final String tagName, final Attributes atts) 105: throws XmlReaderException, SAXException { 106: final XmlReadHandler handler = getRootHandler().createHandler(Object.class, tagName, atts); 107: this.handlers.add(handler); 108: return handler; 109: } 110: 111: /** 112: * Parsing is finished. 113: * 114: * @throws SAXException if there is a parsing error. 115: * @throws XmlReaderException if there is a problem with the reader. 116: * 117: */ 118: protected void doneParsing() throws SAXException, XmlReaderException { 119: final XmlReadHandler[] handler = (XmlReadHandler[]) 120: this.handlers.toArray(new XmlReadHandler[this.handlers.size()]); 121: this.retval = createList(handler.length); 122: for (int i = 0; i < handler.length; i++) { 123: this.retval.add(handler[i].getObject()); 124: } 125: this.handlers.clear(); 126: } 127: 128: /** 129: * Creates a list. 130: * 131: * @param initialSize the initial size. 132: * 133: * @return A new list. 134: */ 135: private List createList(final int initialSize) { 136: if (this.listType.equals("stack")) { 137: return new Stack(); 138: } 139: if (this.listType.equals("linked-list")) { 140: return new LinkedList(); 141: } 142: if (this.listType.equals("vector")) { 143: return new Vector(initialSize); 144: } 145: return new ArrayList(initialSize); 146: } 147: 148: /** 149: * Returns the object under construction. 150: * 151: * @return The list. 152: */ 153: public Object getObject() { 154: return this.retval; 155: } 156: 157: }