Eclipse hints, tips, and random musings » Eclipse 101

Accessible Name

this.getAccessible().addAccessibleListener(new AccessibleAdapter() {
	public void getName(AccessibleEvent e) {
		e.result = "Enter personal information on this form.";
	}
});
	void postEvent(String propertyName, Object oldValue, Object newValue) {
		EventAdmin eventAdmin = getEventAdmin();
		if (eventAdmin == null) return;

		Properties properties = new Properties();
		properties.put(SOURCE, this);
		properties.put(SOURCE_TYPE, this.getClass().getName());
		properties.put(PROPERTY_NAME, propertyName);
		if (oldValue != null) properties.put(OLD_VALUE, oldValue);
		if (newValue != null) properties.put(NEW_VALUE, newValue);

		eventAdmin.postEvent(new Event(PROPERTY_CHANGE_TOPIC, properties));
	}
private ImageProvider getImageProvider(Object object) {
	// First, if the object is an ImageProvider, use it.
	if (ImageProvider.class.isInstance(object)) return (ImageProvider)object;

	// Second, if the object is adaptable, ask it to get an adapter.
	ImageProvider provider = null;
	if (object instanceof IAdaptable)
		provider = (ImageProvider)((IAdaptable)object).getAdapter(ImageProvider.class);

	// If we haven't found an adapter yet, try asking the AdapterManager.
	if (provider == null)
		provider = (ImageProvider)Platform.getAdapterManager().loadAdapter(object, ImageProvider.class.getName());

	return provider;
}
public class Person implements IAdaptable {
	private String name;
	private Object street;
	private Object city;

	public Person(String name) {
		this.name = name;
		this.street = "";
		this.city = "";
	}

	public Object getAdapter(Class adapter) {
		return AdapterManager.getDefault().getAdapter(this, adapter);
	}
	…
}
<plugin>
   <extension
         point="org.eclipse.core.runtime.adapters">
      <factory
            adaptableType="org.eclipse.example.Person"
            class="org.eclipse.example.adapters.PersonPropertiesSourceAdapterFactory">
         <adapter
               type="org.eclipse.ui.views.properties.IPropertySource">
         </adapter>
      </factory>
   </extension>
</plugin>
public class PersonPropertiesSourceAdapterFactory implements IAdapterFactory {
	public Object getAdapter(Object adaptableObject, Class adapterType) {
		if (adapterType == IPropertySource.class)
			return new PersonPropertySource((Person)adaptableObject);
		return null;
	}

	public Class[] getAdapterList() {
		return new Class[] {IPropertySource.class};
	}
}
public class Person {
	private String name;
	private Object street;
	private Object city;

	public Person(String name) {
		this.name = name;
		this.street = "";
		this.city = "";
	}
	...
}
...
public class Person implements IAdaptable {
	private String name;
	private Object street;
	private Object city;

	public Person(String name) {
		this.name = name;
		this.street = “”;
		this.city = “”;
	}

	public Object getAdapter(Class adapter) {
		if (adapter == IPropertySource.class) return new PersonPropertySource(this);
		return null;
	}

	// Getter and setter methods follow…
	…
}
...
public class PersonPropertySource implements IPropertySource {
	private final Person person;

	public PersonPropertySource(Person person) {
		this.person = person;
	}

	public Object getEditableValue() {
		return this;
	}

	public IPropertyDescriptor[] getPropertyDescriptors() {
		return new IPropertyDescriptor[] {
				new TextPropertyDescriptor("name", "Name"),
				new TextPropertyDescriptor("street", "Street"),
				new TextPropertyDescriptor("city", "City")
		};
	}

	public Object getPropertyValue(Object id) {
		if ("name".equals(id)) return person.getName();
		else if ("street".equals(id)) return person.getStreet();
		else if ("city".equals(id)) return person.getCity();
		return null;
	}

	public boolean isPropertySet(Object id) {
		return false;
	}

	public void resetPropertyValue(Object id) {
	}

	public void setPropertyValue(Object id, Object value) {
		if ("name".equals(id)) person.setName((String)value);
		else if ("street".equals(id)) person.setStreet((String)value);
		else if ("city".equals(id)) person.setCity((String)value);
	}

}

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