001    /**
002     * ========================================
003     * JFreeReport : a free Java report library
004     * ========================================
005     *
006     * Project Info:  http://reporting.pentaho.org/
007     *
008     * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009     *
010     * This library is free software; you can redistribute it and/or modify it under the terms
011     * of the GNU Lesser General Public License as published by the Free Software Foundation;
012     * either version 2.1 of the License, or (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016     * See the GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public License along with this
019     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020     * Boston, MA 02111-1307, USA.
021     *
022     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023     * in the United States and other countries.]
024     *
025     * ------------
026     * $Id: AbstractElementReadHandler.java 3525 2007-10-16 11:43:48Z tmorgner $
027     * ------------
028     * (C) Copyright 2000-2005, by Object Refinery Limited.
029     * (C) Copyright 2005-2007, by Pentaho Corporation.
030     */
031    package org.jfree.report.modules.factories.report.flow;
032    
033    import java.util.ArrayList;
034    
035    import org.jfree.report.modules.factories.report.base.NodeReadHandler;
036    import org.jfree.report.structure.Element;
037    import org.jfree.report.structure.Node;
038    import org.jfree.xmlns.parser.AbstractXmlReadHandler;
039    import org.jfree.xmlns.parser.PropertyReadHandler;
040    import org.jfree.xmlns.parser.RootXmlReadHandler;
041    import org.jfree.xmlns.parser.XmlReadHandler;
042    import org.xml.sax.Attributes;
043    import org.xml.sax.SAXException;
044    
045    /**
046     * Creation-Date: 09.04.2006, 13:55:36
047     *
048     * @author Thomas Morgner
049     */
050    public abstract class AbstractElementReadHandler
051        extends AbstractXmlReadHandler implements NodeReadHandler
052    {
053      private boolean virtual;
054      private boolean enabled;
055      private String style;
056      private ArrayList expressionHandlers;
057      private ArrayList styleExpressionHandlers;
058      private ArrayList attributeExpressionHandlers;
059      private ArrayList attributeHandlers;
060      private ArrayList stylePropertyHandlers;
061      private DisplayConditionReadHandler displayConditionReadHandler;
062    
063      protected AbstractElementReadHandler()
064      {
065        expressionHandlers = new ArrayList();
066        styleExpressionHandlers = new ArrayList();
067        attributeExpressionHandlers = new ArrayList();
068        stylePropertyHandlers = new ArrayList();
069        attributeHandlers = new ArrayList();
070      }
071    
072      public boolean isEnabled()
073      {
074        return enabled;
075      }
076    
077      public String getStyle()
078      {
079        return style;
080      }
081    
082      /**
083       * Initialises the handler.
084       *
085       * @param rootHandler the root handler.
086       * @param tagName     the tag name.
087       */
088      public void init(final RootXmlReadHandler rootHandler,
089                       final String uri,
090                       final String tagName)
091      {
092        super.init(rootHandler, uri, tagName);
093    
094        final Element element = getElement();
095        element.setNamespace(uri);
096        element.setType(tagName);
097      }
098    
099      /**
100       * Starts parsing.
101       *
102       * @param attrs the attributes.
103       * @throws SAXException if there is a parsing error.
104       */
105      protected void startParsing(final Attributes attrs) throws SAXException
106      {
107        super.startParsing(attrs);
108        style = attrs.getValue(FlowReportFactoryModule.NAMESPACE, "style");
109        final String enabledValue = attrs.getValue(FlowReportFactoryModule.NAMESPACE, "enabled");
110        if (enabledValue != null)
111        {
112          enabled = "true".equals(enabledValue);
113        }
114        else
115        {
116          enabled = true;
117        }
118    
119        final String virtualValue = attrs.getValue(FlowReportFactoryModule.NAMESPACE, "virtual");
120        if (virtualValue != null)
121        {
122          virtual = "true".equals(virtualValue);
123        }
124        else
125        {
126          virtual = false;
127        }
128      }
129    
130      /**
131       * Returns the handler for a child element.
132       *
133       * @param tagName the tag name.
134       * @param atts    the attributes.
135       * @return the handler or null, if the tagname is invalid.
136       * @throws SAXException       if there is a parsing error.
137       * @throws XmlReaderException if there is a reader error.
138       */
139      protected XmlReadHandler getHandlerForChild(final String uri,
140                                                  final String tagName,
141                                                  final Attributes atts)
142              throws SAXException
143      {
144        if (FlowReportFactoryModule.NAMESPACE.equals(uri))
145        {
146          if ("expression".equals(tagName))
147          {
148            final ExpressionReadHandler erh = new ExpressionReadHandler();
149            expressionHandlers.add(erh);
150            return erh;
151          }
152          if ("style-expression".equals(tagName))
153          {
154            final StyleExpressionReadHandler erh = new StyleExpressionReadHandler();
155            styleExpressionHandlers.add(erh);
156            return erh;
157          }
158          if ("style-property".equals(tagName))
159          {
160            final PropertyReadHandler erh = new PropertyReadHandler();
161            stylePropertyHandlers.add(erh);
162            return erh;
163          }
164          if ("attribute-expression".equals(tagName))
165          {
166            final AttributeExpressionReadHandler erh = new AttributeExpressionReadHandler();
167            attributeExpressionHandlers.add(erh);
168            return erh;
169          }
170          if ("attribute".equals(tagName))
171          {
172            final AttributeReadHandler erh = new AttributeReadHandler();
173            attributeHandlers.add(erh);
174            return erh;
175          }
176          if ("display-condition".equals(tagName))
177          {
178            displayConditionReadHandler = new DisplayConditionReadHandler();
179            return displayConditionReadHandler;
180          }
181        }
182        return null;
183      }
184    
185      protected void configureElement(final Element e)
186      {
187        if (displayConditionReadHandler != null)
188        {
189          e.setDisplayCondition(displayConditionReadHandler.getExpression());
190        }
191        for (int i = 0; i < expressionHandlers.size(); i++)
192        {
193          final ExpressionReadHandler handler =
194                  (ExpressionReadHandler) expressionHandlers.get(i);
195          e.addExpression(handler.getExpression());
196        }
197        for (int i = 0; i < styleExpressionHandlers.size(); i++)
198        {
199          final StyleExpressionReadHandler handler =
200                  (StyleExpressionReadHandler) styleExpressionHandlers .get(i);
201          e.setStyleExpression(handler.getStyleKey(), handler.getExpression());
202        }
203        for (int i = 0; i < stylePropertyHandlers.size(); i++)
204        {
205    
206          final PropertyReadHandler handler =
207                  (PropertyReadHandler) stylePropertyHandlers .get(i);
208          e.getStyle().setPropertyValueAsString(handler.getName(), handler.getResult());
209        }
210        for (int i = 0; i < attributeExpressionHandlers.size(); i++)
211        {
212          final AttributeExpressionReadHandler handler =
213                  (AttributeExpressionReadHandler) attributeExpressionHandlers .get(
214                          i);
215          e.setAttributeExpression(handler.getAttributeName(),
216                  handler.getExpression());
217        }
218        for (int i = 0; i < attributeHandlers.size(); i++)
219        {
220          final AttributeReadHandler handler =
221                  (AttributeReadHandler) attributeHandlers .get(i);
222          e.setAttribute(handler.getNamespace(), handler.getName(), handler.getObject());
223        }
224        e.setEnabled(enabled);
225        e.setVirtual(virtual);
226        if (style != null)
227        {
228          e.setAttribute(FlowReportFactoryModule.NAMESPACE,"style", style);
229        }
230      }
231    
232      protected abstract Element getElement();
233    
234      public final Node getNode()
235      {
236        return getElement();
237      }
238    
239      /**
240       * Returns the object for this element or null, if this element does not
241       * create an object.
242       *
243       * @return the object.
244       * @throws XmlReaderException if there is a parsing error.
245       */
246      public Object getObject() throws SAXException
247      {
248        return getElement();
249      }
250    }