DesignerXMLParser


1   /*
2    * (c) Rob Gordon 2005
3    */
4   package org.oddjob.designer;
5   
6   import java.io.ByteArrayInputStream  ;
7   
8   import org.apache.log4j.Logger;
9   import org.oddjob.arooa.ArooaException;
10  import org.oddjob.arooa.ArooaContext;
11  import org.oddjob.arooa.ArooaConstants;
12  import org.oddjob.arooa.handlers.MainHandler;
13  import org.oddjob.arooa.handlers.MappedPropertyHandler;
14  import org.oddjob.arooa.xml.XMLDefinitionHelper;
15  import org.oddjob.designer.arooa.DesignComponentHandler;
16  import org.oddjob.designer.arooa.DesignElementHandler;
17  import org.oddjob.designer.arooa.DesignValueHandler;
18  import org.oddjob.designer.factory.DesignFactory;
19  import org.oddjob.designer.model.DesignComponent;
20  import org.xml.sax.InputSource  ;
21  
22  /**
23   * Utility class providing various methods for parsing
24   * Designs and DesignXML. 
25   */
26  public class DesignerXMLParser {
27      private static final Logger logger = Logger.getLogger(DesignerXMLParser.class);
28      
29      public static class RootComponent {
30          DesignComponent component;
31          public void addComponent(DesignComponent component) {
32              this.component = component;
33          }
34      }
35      
36      /**
37       * Create a DesignComponent from XML.
38       * 
39       * @param xml The xml.
40       * @return A DesignComponent.
41       * 
42       * @throws ArooaException If parsing the XML fails.
43       */
44      public static DesignComponent buildComponent(String   xml) 
45      throws ArooaException {
46          
47          ArooaContext context = new ArooaContext();
48          context.set(ArooaConstants.COMPONENT_FACTORY, DesignFactory.componentFactory());
49          context.set(ArooaConstants.COMPONENT_HANDLER, new DesignComponentHandler());
50          context.set(ArooaConstants.PROPERTY_HANDLER, new DesignValueHandler());
51          context.set(ArooaConstants.MAPPED_HANDLER, new MappedPropertyHandler());
52          context.set(ArooaConstants.ELEMENT_HANDLER, new DesignElementHandler());
53          
54          RootComponent rootComponent = new RootComponent();
55          context.set(ArooaConstants.CURRENTLY_CONFIGURING, rootComponent);
56                  
57          XMLDefinitionHelper ph = new XMLDefinitionHelper(context);
58          
59          ByteArrayInputStream   in = new ByteArrayInputStream  (xml.getBytes());
60          InputSource   inputSource = new InputSource  (in);
61          ph.parse(inputSource, new MainHandler(new DesignComponentHandler()));
62          
63          return rootComponent.component;
64      }
65      
66  }
67
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