Property Sets

I couldn't find any standard way to load property sets (groups of properties which can then be referenced as a single unit) so implemented one.

Usage:

Code:

---

<bean id="defaultProperties"
  class="ui.PropertySet">
  <property name="properties">
    <map>
      <entry key="property1">
        <ref bean="valueOne"/>
      </entry>
      <entry key="property2">
        <ref bean="valueTwo"/>
      </entry>
    </map>
  </property>
</bean>


<bean id="machineView"
  class="ui.PropertySetViewDescriptor">
  <property name="viewClass">
    <value>ui.view.MachineView</value>
  </property>
  <property name="propertySet">
    <ref bean="defaultProperties"/>
  </property>
</bean>

<bean id="lotView"
  class="ui.PropertySetViewDescriptor">
  <property name="viewClass">
    <value>ui.view.LotView</value>
  </property>
  <property>
    <map>
      <entry key="propertySet">
        <ref bean="defaultProperties"/>
      </entry>
      <entry key="property3">
        <ref bean="propertyThree"/>
      </entry>
    </map>
  </property>
</bean>

---

You can currently nest property sets, though I don't see much of a use case for it w/out a well-defined ordering of precedence, which there currently is not.
The change was fairly minor, but did require a modification to DefaultViewDescriptor; specifically, I extracted a setPropertyValues method from createView in order to get a hook before ((InitializingBean)view).afterPropertiesSet() was called.

If there is an already-established way of grouping properties, I'd very much appreciate hearing about it. If not and anyone else needs this behavior...
(I would've posted attachments, but didn't see the option)

Code:

---

public class PropertySet {
  private Map _properties;
 
  public void setProperties( Map properties ) {
    _properties = properties;
  }
 
  public Map getProperties() {
    return _properties;
  }
}


public class PropertySetViewDescriptor extends DefaultViewDescriptor {
  private PropertySet _propertySet;
 
  public void setPropertySet( PropertySet propertySet ) {
    _propertySet = propertySet;
  }
 
  protected void setPropertyValues( View view, Map properties ) {
    BeanWrapper wrapper = null;
   
    if( properties != null ) {
      wrapper = new BeanWrapperImpl( view );
     
      setProperties( wrapper, properties );
    }
   
    if( _propertySet != null ) {
      if( wrapper == null )
        wrapper = new BeanWrapperImpl( view );
     
      setProperties( wrapper, _propertySet );
    }
  }
 
  private void setProperties( BeanWrapper wrapper, Map properties) {
    for( Iterator keys = properties.keySet().iterator(); keys.hasNext(); ) {
      String key = (String) keys.next();
      Object value = properties.get( key );
     
      if( value instanceof PropertySet )
        setProperties( wrapper, (PropertySet) value );
      else
        wrapper.setPropertyValue( key, value );
    }
  }
 
  private void setProperties( BeanWrapper wrapper, PropertySet set ) {
    Map properties = set.getProperties();
   
    if( properties != null ) {
      setProperties( wrapper, properties );
    }
  }
}


Index: DefaultViewDescriptor.java
===================================================================
RCS file: /cvsroot/spring-rich-c/spring-richclient/src/org/springframework/richclient/application/support/DefaultViewDescriptor.java,v
retrieving revision 1.9
diff -u -r1.9 DefaultViewDescriptor.java
--- DefaultViewDescriptor.java        12 Nov 2004 02:36:53 -0000        1.9
+++ DefaultViewDescriptor.java        18 Dec 2004 16:32:34 -0000
@@ -97,10 +97,7 @@
            }
            getApplicationEventMulticaster().addApplicationListener((ApplicationListener)view);
        }
-        if (viewProperties != null) {
-            BeanWrapper wrapper = new BeanWrapperImpl(view);
-            wrapper.setPropertyValues(viewProperties);
-        }
+        setProperties( view );
 
        if (view instanceof InitializingBean) {
            try {
@@ -113,6 +110,13 @@
        return view;
    }
 
+    private void setProperties( View view ) {
+      if (viewProperties != null) {
+          BeanWrapper wrapper = new BeanWrapperImpl(view);
+          wrapper.setPropertyValues(viewProperties);
+      }
+    }
+
    public CommandButtonLabelInfo getShowViewCommandLabel() {
        return getLabel();
    }

---

I can propose the next way to do almost the same

Code:

---

<bean name="properties" class="java.util.HashMap">
  <constructor-arg index="0">
    <map>
      <entry key="a">
        <value>A</value>
      </entry>
      <entry key="b">
        <value>B</value>
      </entry>
    </map>
  </constructor-arg>
</bean>
...
...
    <property="viewProperties">
      <ref bean="properties"/>
    </property>
...

---

Then if you override standard HashMap you are get all you need. I imply the next functionality:

Code:

---

MyMap map = new MyMap(otherMap);
map.setExtraProperties(thirdMap);

---