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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