Examples of org.eclipse.core.databinding.UpdateValueStrategy

org.eclipse.core.databinding.UpdateValueStrategy
Customizes a {@link Binding} between two {@link IObservableValue observablevalues}. The following behaviors can be customized via the strategy:
- Validation
- Conversion
- Automatic processing
The update phases are:
1. Validate after get - {@link #validateAfterGet(Object)}
2. Conversion - {@link #convert(Object)}
3. Validate after conversion - {@link #validateAfterConvert(Object)}
4. Validate before set - {@link #validateBeforeSet(Object)}
5. Value set - {@link #doSet(IObservableValue,Object)}
Validation:
{@link IValidator Validators} validate the value at multiple phases in theupdate process. Statuses returned from validators are aggregated into a MultiStatus until a status of ERROR or CANCEL is encountered. Either of these statuses will abort the update process. These statuses are available as the {@link Binding#getValidationStatus() binding validation status}.

Conversion:
A {@link IConverter converter} will convert the value from the type of thesource observable into the type of the destination. The strategy has the ability to default converters for common scenarios.

Automatic processing:
The processing to perform when the source observable changes. This behavior is configured via policies provided on construction of the strategy (e.g. {@link #POLICY_NEVER}, {@link #POLICY_CONVERT}, {@link #POLICY_ON_REQUEST}, {@link #POLICY_UPDATE}).
@see DataBindingContext#bindValue(IObservableValue,IObservableValue,UpdateValueStrategy,UpdateValueStrategy) @see Binding#getValidationStatus() @see IValidator @see IConverter @since 1.0

        Text txtValue = createTextInput(editArea, label, SWT.NONE, 12);
        txtValue.setTextLimit(12);


        context.bindValue(SWTObservables.observeText(txtValue, SWT.Modify), //
                        BeansObservables.observeValue(model, property), //
                        new UpdateValueStrategy().setAfterConvertValidator(new IValidator()
                        {
                            @Override
                            public IStatus validate(Object value)
                            {
                                String v = (String) value;

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        // model binding
        final Binding binding = bindings.getBindingContext().bindValue(
                        SWTObservables.observeText(value, SWT.Modify),
                        BeansObservables.observeValue(attribute, "value"), //$NON-NLS-1$
                        new UpdateValueStrategy().setConverter(new ToAttributeObjectConverter(attribute)),
                        new UpdateValueStrategy().setConverter(new ToAttributeStringConverter(attribute)));


        // delete selection listener
        deleteButton.addSelectionListener(new SelectionAdapter()
        {
            @Override

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        // bind to model


        bindings.getBindingContext().bindValue(SWTObservables.observeText(name, SWT.Modify), //
                        BeansObservables.observeValue(model, "name"), //$NON-NLS-1$
                        new UpdateValueStrategy().setAfterConvertValidator(new IValidator()
                        {
                            @Override
                            public IStatus validate(Object value)
                            {
                                String v = (String) value;

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        GridDataFactory.fillDefaults().align(SWT.FILL, SWT.FILL).grab(true, false).applyTo(lblPrice);


        getBindingContext().bindValue(
                        SWTObservables.observeText(lblPrice),
                        BeansObservables.observeValue(getModel(), "price"), //$NON-NLS-1$
                        new UpdateValueStrategy(false, UpdateValueStrategy.POLICY_UPDATE)
                                        .setConverter(new StringToCurrencyConverter(Values.Amount)), //
                        new UpdateValueStrategy(false, UpdateValueStrategy.POLICY_UPDATE)
                                        .setConverter(new CurrencyToStringConverter(Values.Amount)));


        // fees
        bindings().bindAmountInput(editArea, Messages.ColumnFees, "fees"); //$NON-NLS-1$

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      t.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      t.setEditable(false);
      final Binding bd = dbc.bindValue(
          WidgetProperties.text().observe(t), 
          BeanProperties.value("fragmentRoot").observe(clazz), 
          new UpdateValueStrategy(), 
          new UpdateValueStrategy().setConverter(new PackageFragmentRootToStringConverter())
      );


      Button b = new Button(parent, SWT.PUSH);
      b.setText("Browse ...");
      b.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
          IPackageFragmentRoot root = choosePackageRoot();
          if( root != null ) {
            froot = root;
            clazz.setFragmentRoot(root);  
          }
          bd.updateModelToTarget(); //TODO Find out why this is needed
        }
      });
    }


    {
      Label l = new Label(parent, SWT.NONE);
      l.setText("Package");


      Text t = new Text(parent, SWT.BORDER);
      t.setEditable(false);
      t.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      final Binding bd = dbc.bindValue(
          WidgetProperties.text().observe(t), 
          BeanProperties.value("packageFragment").observe(clazz),
          new UpdateValueStrategy(), 
          new UpdateValueStrategy().setConverter(new PackageFragmentToStringConverter())
      );


      Button b = new Button(parent, SWT.PUSH);
      b.setText("Browse ...");
      b.addSelectionListener(new SelectionAdapter() {

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      t.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      t.setEditable(false);
      final Binding bd = dbc.bindValue(
          WidgetProperties.text().observe(t), 
          BeanProperties.value("fragmentRoot").observe(clazz), 
          new UpdateValueStrategy(), 
          new UpdateValueStrategy().setConverter(new PackageFragmentRootToStringConverter())
      );


      Button b = new Button(parent, SWT.PUSH);
      b.setText("Browse ...");
      b.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
          IPackageFragmentRoot root = choosePackageRoot();
          if( root != null ) {
            froot = root;
            clazz.setFragmentRoot(root);  
          }
          bd.updateModelToTarget(); //TODO Find out why this is needed
        }
      });
    }


    {
      Label l = new Label(parent, SWT.NONE);
      l.setText("Package");


      Text t = new Text(parent, SWT.BORDER);
      t.setEditable(false);
      t.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      final Binding bd = dbc.bindValue(
          WidgetProperties.text().observe(t), 
          BeanProperties.value("packageFragment").observe(clazz),
          new UpdateValueStrategy(), 
          new UpdateValueStrategy().setConverter(new PackageFragmentToStringConverter())
      );


      Button b = new Button(parent, SWT.PUSH);
      b.setText("Browse ...");
      b.addSelectionListener(new SelectionAdapter() {

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