Java IConverter类代码示例

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public <T> T convert(Object propValue, Class<T> valueType) {
	if (propValue == null) {
		return null;
	}

	if (valueType.equals(propValue.getClass())) {
		return (T) propValue;
	}

	IConverter converter = getConverter(propValue.getClass(), valueType);

	if (converter != null) {
		T convertedValue = (T) converter.convert(propValue);
		return convertedValue;
	}

	throw new UnsupportedOperationException(
			"Could not convert from '" + propValue.getClass() + "' to '" + valueType + "'");
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
public void initBindings(IObservableList modelObservable){
	
	if(currentObservable == modelObservable){
		return;
	}
	
	if(bindingContext != null){
		bindingContext.dispose();
		bindingContext = null;
	}
	bindingContext = new DataBindingContext();
	
	CompositeContainerChildProperty childrenProp = new CompositeContainerChildProperty();
	IObservableList childObs = childrenProp.observe(this);
	
	IConverter[] converter = getCompositeContainerChildConverter(modelObservable.getElementType());
	UpdateListStrategy t2mStrategy = new UpdateListStrategy(UpdateListStrategy.POLICY_UPDATE);
	t2mStrategy.setConverter(converter[0]);
	
	UpdateListStrategy m2tStrategy = new UpdateListStrategy(UpdateListStrategy.POLICY_UPDATE);
	m2tStrategy.setConverter(converter[1]);
	
	bindingContext.bindList(childObs, modelObservable, t2mStrategy, m2tStrategy);
	bindingContext.updateTargets();
	currentObservable = modelObservable;
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
public IConverter getConverter(Class<?> from, Class<?> to) {
	IConverter converter = strategy.createConverter(from, to);

	if (converter != null) {
		return converter;
	}

	// TODO allow for user registered converters lookup
	return null;
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
@Override
protected void bindWidgets(DataAdapter dataAdapter) {
	bindingContext.bindValue(
			SWTObservables.observeText(hostname, SWT.Modify),
			PojoObservables.observeValue(dataAdapter, "hostname")); //$NON-NLS-1$
	bindingContext.bindValue(
			SWTObservables.observeText(keyspace, SWT.Modify),
			PojoObservables.observeValue(dataAdapter, "keyspace")); //$NON-NLS-1$
	NumberFormat numberFormat = NumberFormat.getIntegerInstance();
	numberFormat.setGroupingUsed(false);
	IConverter targetToModelConverter = StringToNumberConverter.toInteger(numberFormat, true);
	IConverter modelToTargetConverter = NumberToStringConverter.fromInteger(numberFormat, true);
	bindingContext.bindValue(
			SWTObservables.observeText(port, SWT.Modify),
			PojoObservables.observeValue(dataAdapter, "port"),
			new UpdateValueStrategy().setConverter(targetToModelConverter),
			new UpdateValueStrategy().setConverter(modelToTargetConverter)); //$NON-NLS-1$
	bindingContext.bindValue(
			SWTObservables.observeText(username, SWT.Modify),
			PojoObservables.observeValue(dataAdapter, "username")); //$NON-NLS-1$
	bindingContext.bindValue(
			SWTObservables.observeText(password, SWT.Modify),
			PojoObservables.observeValue(dataAdapter, "password")); //$NON-NLS-1$
	
	port.addVerifyListener(new VerifyListener() {
		@Override
		public void verifyText(VerifyEvent e) {
			for (char c : e.text.toCharArray()){
				if (!Character.isDigit(c)) {
					e.doit = false;
					return;
				}
			}
		}
	});
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
@Override
protected IConverter createConverter(Object fromType, Object toType) {
	if (fromType instanceof EAttribute && toType == String.class) {
		return new RelativePathToStringConverter();
	} else if (fromType == String.class && toType instanceof EAttribute) {
		return new StringToRelativePathConverter();
	}
	return super.createConverter(fromType, toType);
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
/**
 * Returns an observable observing the text attribute of the provided <code>control</code>. The supported types
 * are:
 * <ul>
 * <li>org.eclipse.swt.widgets.Text</li>
 * <li>org.eclipse.swt.custom.StyledText (as of 1.3)</li>
 * </ul>
 * 
 * @param control
 * @param event event type to register for change events {@literal SWT.FocusOut  SWT.Modify or SWT.NONE}
 * @param bean
 * @param propertyName
 * @param validator
 * @param converter
 * @return binding
 * @throws IllegalArgumentException if <code>control</code> type is unsupported
 */
public DecoratedBinding bindText(Control control, int event, Object bean, String propertyName,
		IValidator validator, IConverter targetToModelConverter, IConverter modelToTargetConverter) {

	// IObservableValue widgetValue =
	// WidgetProperties.text(SWT.Modify).observe(serverUriText);
	// IObservableValue modelValuea = BeanProperties.value(Connection.class,
	// "serverURI").observe(connection);

	// observe
	IObservableValue widgetValue = SWTObservables.observeText(control, event);
	IObservableValue modelValue = BeansObservables.observeValue(bean, propertyName);

	UpdateValueStrategy targetToModel = new UpdateValueStrategy();
	UpdateValueStrategy modelToTarget = new UpdateValueStrategy();

	// targetToModel
	// validator
	if (validator != null) {
		targetToModel.setBeforeSetValidator(validator);
	}
	// converter
	if (targetToModelConverter != null) {
		targetToModel.setConverter(targetToModelConverter);
	}

	// modelToTarget
	if (modelToTargetConverter != null) {
		modelToTarget.setConverter(modelToTargetConverter);
	}

	Binding bindValue = context.bindValue(widgetValue, modelValue, targetToModel, modelToTarget);

	// decoration
	ControlDecorationSupport decorationSupport = ControlDecorationSupport.create(bindValue, SWT.TOP | SWT.LEFT);

	return new DecoratedBinding(bindValue, decorationSupport);
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
public IConverter getConverter() {
	return converter;
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
public void setConverter(IConverter converter) {
	this.converter = converter;
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
public IConverter createConverter(Object fromType, Object toType) {
	return super.createConverter(fromType, toType);
}
 

import org.eclipse.core.databinding.conversion.IConverter; //导入依赖的package包/类
@PostConstruct
@SuppressWarnings("unchecked")
public void createPartControl(Composite parent) {
	// create the Person model with programming skills
	Person person = new Person();
	person.setName("John");
	person.setProgrammingSkills(new String[] { "Java", "JavaScript", "Groovy" });
	GridLayoutFactory.swtDefaults().numColumns(2).applyTo(parent);
	Label programmingSkillsLabel = new Label(parent, SWT.NONE);
	programmingSkillsLabel.setText("Programming Skills");
	GridDataFactory.swtDefaults().applyTo(programmingSkillsLabel);
	Text programmingSkillsText = new Text(parent, SWT.BORDER);
	GridDataFactory.fillDefaults().grab(true, false).applyTo(programmingSkillsText);
	// Do the actual binding and conversion
	DataBindingContext dbc = new DataBindingContext();

	// define converters
	IConverter convertToStringArray = IConverter.create(String.class, String[].class,
			(o1) -> ((String) o1).split(","));
	IConverter convertToString = IConverter.create(String[].class, String.class, (o1) -> convert((String[]) o1));
	;

	// create the observables, which should be bound
	IObservableValue<Text> programmingSkillsTarget = WidgetProperties.text(SWT.Modify)
			.observe(programmingSkillsText);
	IObservableValue<Person> programmingSkillsModel = BeanProperties.value("programmingSkills").observe(person);

	UpdateValueStrategy updateStrategy = UpdateValueStrategy.create(convertToStringArray);
	updateStrategy.setAfterGetValidator((o1) -> {
		String s = (String) o1;
		if (!s.contains("Perl")) {
			return ValidationStatus.ok();
		}
		return ValidationStatus.error("Perl is not a programming language");

	});

	// bind observables together with the appropriate UpdateValueStrategies
	dbc.bindValue(programmingSkillsTarget, programmingSkillsModel,
			updateStrategy,
			UpdateValueStrategy.create(convertToString));

	// button to check the data model
	Button button = new Button(parent, SWT.PUSH);
	button.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
	button.setText("Show data model");
	button.addSelectionListener(new SelectionAdapter() {
		@Override
		public void widgetSelected(SelectionEvent e) {
			for (String string : person.getProgrammingSkills()) {
				System.out.println(string);

			}
		}
	});

}