Examples of org.springframework.binding.value.ValueModel

Package org.springframework.binding.value

Examples of org.springframework.binding.value.ValueModel

org.springframework.binding.value.ValueModel
Describes models with a generic access to a single value that allow to observe value changes. The value can be accessed using the #getValue()/#setValue(Object)/ #setValueSilently(Object, PropertyChangeListener) methods. Observers can register instances of PropertyChangeListener to be notified if the value changes.
The listeners registered with this ValueModel using #addValueChangeListener will be invoked only with PropertyChangeEvents that have the name set to "value".
AbstractValueModel minimizes the effort required to implement this interface. It uses the PropertyChangeSupport to fire PropertyChangeEvents, and it adds PropertyChangeListeners for the specific property name "value". This ensures that the constraint mentioned above is met. @see org.springframework.binding.value.support.AbstractValueModel @author Karsten Lentzsch @author Keith Donald @author Oliver Hutchison

  protected AbstractFormModel(ValueModel domainObjectHolder, boolean buffered) {
    this(new BeanPropertyAccessStrategy(domainObjectHolder), buffered);
  }


  protected AbstractFormModel(MutablePropertyAccessStrategy propertyAccessStrategy, boolean buffered) {
    ValueModel domainObjectHolder = propertyAccessStrategy.getDomainObjectHolder();
    prepareValueModel(domainObjectHolder);
    this.formObjectHolder = new FormModelMediatingValueModel(domainObjectHolder, false);
    this.propertyAccessStrategy = propertyAccessStrategy;
    this.buffered = buffered;
    if (domainObjectHolder.getValue() != null)
      this.defaultInstanceClass = domainObjectHolder.getValue().getClass();
  }

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  public boolean hasValueModel(String formProperty) {
    return propertyValueModels.containsKey(formProperty);
  }


  public ValueModel getValueModel(String formProperty) {
    ValueModel propertyValueModel = (ValueModel) propertyValueModels.get(formProperty);
    if (propertyValueModel == null) {
      propertyValueModel = add(formProperty);
    }
    return propertyValueModel;
  }

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    return propertyValueModel;
  }


  public ValueModel getValueModel(String formProperty, Class targetClass) {
    final ConvertingValueModelKey key = new ConvertingValueModelKey(formProperty, targetClass);
    ValueModel convertingValueModel = (ValueModel) convertingValueModels.get(key);
    if (convertingValueModel == null) {
      convertingValueModel = createConvertingValueModel(formProperty, targetClass);
      convertingValueModels.put(key, convertingValueModel);
    }
    return convertingValueModel;

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  protected ValueModel createConvertingValueModel(String formProperty, Class targetClass) {
    if (logger.isDebugEnabled()) {
      logger.debug("Creating converting value model for form property '" + formProperty
          + "' converting to type '" + targetClass + "'.");
    }
    final ValueModel sourceValueModel = getValueModel(formProperty);
    Assert.notNull(sourceValueModel, "Form does not have a property called '" + formProperty + "'.");
    final Class sourceClass = ClassUtils
        .convertPrimitiveToWrapper(getFieldMetadata(formProperty).getPropertyType());
    // sourceClass can be null when using eg Map, assume that given
    // targetClass is the correct one
    if ((sourceClass == null) || (sourceClass == targetClass)) {
      return sourceValueModel;
    }


    final ConversionService conversionService = getConversionService();
    ConversionExecutor convertTo = null;
    ConversionExecutor convertFrom = null;


    // Check for locally registered property converters
    if (propertyConversionServices.containsKey(formProperty)) {
      // TODO - extract ConfigurableConversionService interface...
      final GenericConversionService propertyConversionService = (GenericConversionService) propertyConversionServices
          .get(formProperty);


      if (propertyConversionService != null) {
        convertTo = propertyConversionService.getConversionExecutor(sourceClass, targetClass);
        convertFrom = propertyConversionService.getConversionExecutor(targetClass, sourceClass);
      }
    }


    // If we have nothing from the property level, then try the conversion
    // service
    if (convertTo == null) {
      convertTo = conversionService.getConversionExecutor(sourceClass, targetClass);
    }
    Assert.notNull(convertTo, "conversionService returned null ConversionExecutor");


    if (convertFrom == null) {
      convertFrom = conversionService.getConversionExecutor(targetClass, sourceClass);
    }
    Assert.notNull(convertFrom, "conversionService returned null ConversionExecutor");


    ValueModel convertingValueModel = preProcessNewConvertingValueModel(formProperty, targetClass,
        new TypeConverter(sourceValueModel, convertTo, convertFrom));
    preProcessNewConvertingValueModel(formProperty, targetClass, convertingValueModel);
    return convertingValueModel;
  }

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  public ValueModel addMethod(String propertyMethodName, String[] derivedFromProperties) {
    ValueModel[] propertyValueModels = new ValueModel[derivedFromProperties.length];
    for (int i = 0; i < propertyValueModels.length; i++) {
      propertyValueModels[i] = getValueModel(derivedFromProperties[i]);
    }
    ValueModel valueModel = new MethodInvokingDerivedValueModel(this, propertyMethodName, propertyValueModels);
    return add(propertyMethodName, valueModel);
  }

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        BufferedValueModel buffer = createDefaultBufferedValueModel();
        
        assertSame(wrapped, buffer.getWrappedValueModel());
        assertSame(wrapped, buffer.getInnerMostWrappedValueModel());
        
        ValueModel nestedValueModel = new AbstractValueModelWrapper(wrapped) {};
        buffer = new BufferedValueModel(nestedValueModel);
        assertSame(nestedValueModel, buffer.getWrappedValueModel());
        assertSame(wrapped, buffer.getInnerMostWrappedValueModel());
    }

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    /**
     * Tests read actions on a read-only model.
     */
    public void testReadOnly() {
        TestBean bean = new TestBean();
        ValueModel readOnlyModel = new BeanPropertyAccessStrategy(bean).getPropertyValueModel("readOnly");
        BufferedValueModel buffer = new BufferedValueModel(readOnlyModel, commitTrigger);
        
        assertSame(
            "Can read values from a read-only model.", 
            buffer.getValue(),
            readOnlyModel.getValue());
        
        Object newValue1 = "new value";
        buffer.setValue(newValue1);
        assertSame(
            "Can read values from a read-only model when buffering.",

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  public Object getValue(String formProperty) {
    return formModel.getValueModel(formProperty).getValue();
  }


  public ValueModel getValueModel(String formProperty) {
    ValueModel valueModel = formModel.getValueModel(formProperty);
    if (valueModel == null) {
      logger.warn("A value model for property '" + formProperty + "' could not be found.  Typo?");
    }
    return valueModel;
  }

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        return getBufferedCollectionValueModel(backingCollecton, backingCollecton.getClass());
    }


    private BufferedCollectionValueModel getBufferedCollectionValueModel(Object backingCollecton,
            Class backingCollectionClass) {
        ValueModel vm = new ValueHolder(backingCollecton);
        return new BufferedCollectionValueModel(vm, backingCollectionClass);
    }

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  public void testGetValueModelFromPAS() {
    TestBean p = new TestBean();
    TestPropertyAccessStrategy tpas = new TestPropertyAccessStrategy(p);
    AbstractFormModel fm = getFormModel(tpas, true);
    ValueModel vm1 = fm.getValueModel("simpleProperty");
    assertEquals(1, tpas.numValueModelRequests());
    assertEquals("simpleProperty", tpas.lastRequestedValueModel());
    ValueModel vm2 = fm.getValueModel("simpleProperty");
    assertEquals(vm1, vm2);
    assertEquals(1, tpas.numValueModelRequests());


    try {
      fm.getValueModel("iDontExist");

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