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

        for (int ii = 0; ii < weightObservables.size(); ii++)
        {
            IObservableValue observable = weightObservables.get(ii);
            ClassificationLink link = designation.getLinks().get(ii);


            UpdateValueStrategy strategy = new UpdateValueStrategy();
            strategy.setAfterConvertValidator(new GreaterThanZeroValidator());


            validators.add(bindings.getBindingContext().bindValue(multiValidator.observeValidatedValue(observable),
                            BeansObservables.observeValue(link, "weight"), strategy, null)); //$NON-NLS-1$
        }
    }

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        for (int ii = 0; ii < classificationObservables.size(); ii++)
        {
            IObservableValue observable = classificationObservables.get(ii);
            ClassificationLink link = designation.getLinks().get(ii);


            UpdateValueStrategy strategy = new UpdateValueStrategy();
            strategy.setAfterConvertValidator(new NotNullValidator());


            validators.add(bindings.getBindingContext().bindValue(multiValidator.observeValidatedValue(observable),
                            BeansObservables.observeValue(link, "classification"), strategy, null)); //$NON-NLS-1$
        }
    }

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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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        });


        bindings().getBindingContext().bindValue(
                        SWTObservables.observeText(txtValue, SWT.Modify), //
                        BeansObservables.observeValue(getModel(), "shares"), //$NON-NLS-1$
                        new UpdateValueStrategy().setConverter(new StringToCurrencyConverter(Values.Share)),
                        new UpdateValueStrategy().setConverter(new CurrencyToStringConverter(Values.Share)));


        Button button = new Button(inputArea, SWT.ARROW | SWT.DOWN);
        button.addSelectionListener(new SelectionAdapter()
        {
            @Override

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        // error label
        context.bindValue(SWTObservables.observeText(errorLabel), //
                        new AggregateValidationStatus(context, AggregateValidationStatus.MAX_SEVERITY), //
                        null, //
                        new UpdateValueStrategy().setConverter(new StatusTextConverter()));
    }

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        combo.setContentProvider(ArrayContentProvider.getInstance());
        combo.setLabelProvider(labelProvider);
        combo.setInput(input);
        GridDataFactory.fillDefaults().align(SWT.FILL, SWT.FILL).grab(true, false).applyTo(combo.getControl());


        UpdateValueStrategy strategy = new UpdateValueStrategy();
        if (validator != null)
            strategy.setAfterConvertValidator(validator);


        context.bindValue(ViewersObservables.observeSingleSelection(combo), //
                        BeansObservables.observeValue(model, property), strategy, null);
        return combo;
    }

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        Text txtValue = createTextInput(editArea, label);


        context.bindValue(
                        SWTObservables.observeText(txtValue, SWT.Modify), //
                        BeansObservables.observeValue(model, property), //
                        new UpdateValueStrategy().setConverter(new StringToCurrencyConverter(Values.Amount)),
                        new UpdateValueStrategy().setConverter(new CurrencyToStringConverter(Values.Amount)));
    }

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    private void bindMandatoryDecimalInput(final String label, String property, Text txtValue, Values<?> type)
    {
        context.bindValue(SWTObservables.observeText(txtValue, SWT.Modify), //
                        BeansObservables.observeValue(model, property), //
                        new UpdateValueStrategy() //
                                        .setConverter(new StringToCurrencyConverter(type)) //
                                        .setAfterConvertValidator(new IValidator()
                                        {
                                            @Override
                                            public IStatus validate(Object value)
                                            {
                                                Long v = (Long) value;
                                                return v != null && v.longValue() > 0 ? ValidationStatus.ok()
                                                                : ValidationStatus.error(MessageFormat.format(
                                                                                Messages.MsgDialogInputRequired, label));
                                            }
                                        }), // ,
                        new UpdateValueStrategy().setConverter(new CurrencyToStringConverter(type)));
    }

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    {
        Text txtValue = createTextInput(editArea, label);


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

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    {
        Text txtValue = createTextInput(editArea, label);


        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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