Source Code Cross Referenced for ItemHandler.java in  » Chart » jfreechart » org » jfree » data » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.data.xml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006:         *
007:         * Project Info:  http://www.jfree.org/jfreechart/index.html
008:         *
009:         * This library is free software; you can redistribute it and/or modify it 
010:         * under the terms of the GNU Lesser General Public License as published by 
011:         * the Free Software Foundation; either version 2.1 of the License, or 
012:         * (at your option) any later version.
013:         *
014:         * This library is distributed in the hope that it will be useful, but 
015:         * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016:         * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017:         * License for more details.
018:         *
019:         * You should have received a copy of the GNU Lesser General Public
020:         * License along with this library; if not, write to the Free Software
021:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022:         * USA.  
023:         *
024:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025:         * in the United States and other countries.]
026:         *
027:         * ----------------
028:         * ItemHandler.java
029:         * ----------------
030:         * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
031:         *
032:         * Original Author:  David Gilbert (for Object Refinery Limited);
033:         * Contributor(s):   -;
034:         *
035:         * $Id: ItemHandler.java,v 1.3.2.1 2005/10/25 21:36:10 mungady Exp $
036:         *
037:         * Changes (from 21-Jun-2001)
038:         * --------------------------
039:         * 23-Jan-2003 : Version 1 (DG);
040:         *
041:         */
042:
043:        package org.jfree.data.xml;
044:
045:        import org.xml.sax.Attributes;
046:        import org.xml.sax.SAXException;
047:        import org.xml.sax.helpers.DefaultHandler;
048:
049:        /**
050:         * A handler for reading key-value items.
051:         */
052:        public class ItemHandler extends DefaultHandler implements  DatasetTags {
053:
054:            /** The root handler. */
055:            private RootHandler root;
056:
057:            /** The parent handler (can be the same as root, but not always). */
058:            private DefaultHandler parent;
059:
060:            /** The key. */
061:            private Comparable key;
062:
063:            /** The value. */
064:            private Number value;
065:
066:            /**
067:             * Creates a new item handler.
068:             *
069:             * @param root  the root handler.
070:             * @param parent  the parent handler.
071:             */
072:            public ItemHandler(RootHandler root, DefaultHandler parent) {
073:                this .root = root;
074:                this .parent = parent;
075:                this .key = null;
076:                this .value = null;
077:            }
078:
079:            /**
080:             * Returns the key that has been read by the handler, or <code>null</code>.
081:             *
082:             * @return The key.
083:             */
084:            public Comparable getKey() {
085:                return this .key;
086:            }
087:
088:            /**
089:             * Sets the key.
090:             *
091:             * @param key  the key.
092:             */
093:            public void setKey(Comparable key) {
094:                this .key = key;
095:            }
096:
097:            /**
098:             * Returns the key that has been read by the handler, or <code>null</code>.
099:             *
100:             * @return The value.
101:             */
102:            public Number getValue() {
103:                return this .value;
104:            }
105:
106:            /**
107:             * Sets the value.
108:             *
109:             * @param value  the value.
110:             */
111:            public void setValue(Number value) {
112:                this .value = value;
113:            }
114:
115:            /**
116:             * The start of an element.
117:             *
118:             * @param namespaceURI  the namespace.
119:             * @param localName  the element name.
120:             * @param qName  the element name.
121:             * @param atts  the attributes.
122:             *
123:             * @throws SAXException for errors.
124:             */
125:            public void startElement(String namespaceURI, String localName,
126:                    String qName, Attributes atts) throws SAXException {
127:
128:                if (qName.equals(ITEM_TAG)) {
129:                    KeyHandler subhandler = new KeyHandler(this .root, this );
130:                    this .root.pushSubHandler(subhandler);
131:                } else if (qName.equals(VALUE_TAG)) {
132:                    ValueHandler subhandler = new ValueHandler(this .root, this );
133:                    this .root.pushSubHandler(subhandler);
134:                } else {
135:                    throw new SAXException(
136:                            "Expected <Item> or <Value>...found " + qName);
137:                }
138:
139:            }
140:
141:            /**
142:             * The end of an element.
143:             *
144:             * @param namespaceURI  the namespace.
145:             * @param localName  the element name.
146:             * @param qName  the element name.
147:             */
148:            public void endElement(String namespaceURI, String localName,
149:                    String qName) {
150:
151:                if (this .parent instanceof  PieDatasetHandler) {
152:                    PieDatasetHandler handler = (PieDatasetHandler) this .parent;
153:                    handler.addItem(this .key, this .value);
154:                    this .root.popSubHandler();
155:                } else if (this .parent instanceof  CategorySeriesHandler) {
156:                    CategorySeriesHandler handler = (CategorySeriesHandler) this.parent;
157:                    handler.addItem(this.key, this.value);
158:                    this.root.popSubHandler();
159:                }
160:
161:            }
162:
163:        }
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