Master detail binding with nested properties

package master.detail.binding.test;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.viewers.IViewerObservableValue;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.ViewPart;

public class View extends ViewPart {
  class Model {
    PropertyChangeSupport changes = new PropertyChangeSupport(this);

    Model2 model2;

    public Model(Model2 model2) {
      this.model2 = model2;
    }

    public void addPropertyChangeListener(PropertyChangeListener listener) {
      changes.addPropertyChangeListener(listener);
    }

    public void addPropertyChangeListener(String propertyName,
        PropertyChangeListener listener) {
      changes.addPropertyChangeListener(propertyName, listener);
    }

    public void removePropertyChangeListener(PropertyChangeListener listener) {
      changes.removePropertyChangeListener(listener);
    }

    public void removePropertyChangeListener(String propertyName,
        PropertyChangeListener listener) {
      changes.removePropertyChangeListener(propertyName, listener);
    }

    public Model2 getModel2() {
      return model2;
    }

    public void setModel2(Model2 model2) {
      Model2 old = this.model2;
      this.model2 = model2;
      changes.firePropertyChange("model2", old, model2);
    }

    @Override
    public String toString() {
      return "model2: " + model2.getText();
    }
  }

  class Model2 {
    PropertyChangeSupport changes = new PropertyChangeSupport(this);

    String text;

    public Model2(String text) {
      this.text = text;
    }

    public void addPropertyChangeListener(PropertyChangeListener listener) {
      changes.addPropertyChangeListener(listener);
    }

    public void addPropertyChangeListener(String propertyName,
        PropertyChangeListener listener) {
      changes.addPropertyChangeListener(propertyName, listener);
    }

    public String getText() {
      return text;
    }

    public void removePropertyChangeListener(PropertyChangeListener listener) {
      changes.removePropertyChangeListener(listener);
    }

    public void removePropertyChangeListener(String propertyName,
        PropertyChangeListener listener) {
      changes.removePropertyChangeListener(propertyName, listener);
    }

    public void setText(String text) {
      String old = this.text;
      this.text = text;
      changes.firePropertyChange("text", old, text);
    }

    @Override
    public String toString() {
      return text;
    }
  }

  /**
   * The content provider class is responsible for providing objects to the
   * view. It can wrap existing objects in adapters or simply return objects
   * as-is. These objects may be sensitive to the current input of the view,
   * or ignore it and always show the same content (like Task List, for
   * example).
   */
  class ViewContentProvider implements IStructuredContentProvider {
    public void dispose() {
    }

    public Object[] getElements(Object parent) {
      if (parent instanceof Object[]) {
        return (Object[]) parent;
      }
      return new Object[0];
    }

    public void inputChanged(Viewer v, Object oldInput, Object newInput) {
    }
  }

  class ViewLabelProvider extends LabelProvider implements ITableLabelProvider {
    public Image getColumnImage(Object obj, int index) {
      return getImage(obj);
    }

    public String getColumnText(Object obj, int index) {
      return getText(obj);
    }

    public Image getImage(Object obj) {
      return PlatformUI.getWorkbench().getSharedImages()
          .getImage(ISharedImages.IMG_OBJ_ELEMENT);
    }
  }

  public static final String ID = "master.detail.binding.test.view";

  PropertyChangeSupport changes = new PropertyChangeSupport(this);

  String text;

  private Label selection;

  private TableViewer viewer;

  public void addPropertyChangeListener(PropertyChangeListener listener) {
    changes.addPropertyChangeListener(listener);
  }

  public void addPropertyChangeListener(String propertyName,
      PropertyChangeListener listener) {
    changes.addPropertyChangeListener(propertyName, listener);
  }

  /**
   * This is a callback that will allow us to create the viewer and initialize
   * it.
   */
  public void createPartControl(Composite parent) {
    viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
    viewer.setContentProvider(new ViewContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
    // Provide the input to the ContentProvider
    viewer.setInput(new Model[] { new Model(new Model2("One")),
        new Model(new Model2("Two")), new Model(new Model2("Three")) });

    selection = new Label(parent, SWT.NONE);

    DataBindingContext ctx = new DataBindingContext();

    IViewerObservableValue ssel = ViewersObservables
        .observeSinglePostSelection(viewer);
    ctx.bindValue(BeansObservables.observeDetailValue(ssel, "model2.text",
        String.class), BeansObservables.observeValue(this, "text"),
        new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE),
        new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE));
    ctx.bindValue(SWTObservables.observeText(selection),
        BeansObservables.observeDetailValue(ssel, "model2.text", String.class),
        new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER),
        new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE));

    ssel.addValueChangeListener(new IValueChangeListener() {
      @Override
      public void handleValueChange(ValueChangeEvent event) {
        System.out.println(event.diff.getNewValue());
      }
    });
  }

  public void removePropertyChangeListener(PropertyChangeListener listener) {
    changes.removePropertyChangeListener(listener);
  }

  public void removePropertyChangeListener(String propertyName,
      PropertyChangeListener listener) {
    changes.removePropertyChangeListener(propertyName, listener);
  }

  /**
   * Passing the focus request to the viewer's control.
   */
  public void setFocus() {
    viewer.getControl().setFocus();
  }

  public String getText() {
    return text;
  }

  public void setText(String text) {
    String old = this.text;
    this.text = text;
    changes.firePropertyChange("text", old, text);
    System.out.println("setText(\"" + text + "\")");
  }

}