How to use

getPropertyAccessor

method

in

org.springframework.validation.AbstractPropertyBindingResult

/**
 * Returns the underlying PropertyAccessor.
 * @see #getPropertyAccessor()
 */
@Override
public PropertyEditorRegistry getPropertyEditorRegistry() {
  return (getTarget() != null ? getPropertyAccessor() : null);
}

/**
 * Return the underlying PropertyAccessor of this binder's BindingResult.
 */
protected ConfigurablePropertyAccessor getPropertyAccessor() {
  return getInternalBindingResult().getPropertyAccessor();
}

/**
 * Fetches the field value from the PropertyAccessor.
 * @see #getPropertyAccessor()
 */
@Override
@Nullable
protected Object getActualFieldValue(String field) {
  return getPropertyAccessor().getPropertyValue(field);
}

/**
 * Retrieve the custom PropertyEditor for the given field, if any.
 * @param fixedField the fully qualified field name
 * @return the custom PropertyEditor, or {@code null}
 */
@Nullable
protected PropertyEditor getCustomEditor(String fixedField) {
  Class<?> targetType = getPropertyAccessor().getPropertyType(fixedField);
  PropertyEditor editor = getPropertyAccessor().findCustomEditor(targetType, fixedField);
  if (editor == null) {
    editor = BeanUtils.findEditorByConvention(targetType);
  }
  return editor;
}

public void initConversion(ConversionService conversionService) {
  Assert.notNull(conversionService, "ConversionService must not be null");
  this.conversionService = conversionService;
  if (getTarget() != null) {
    getPropertyAccessor().setConversionService(conversionService);
  }
}

/**
 * Fetches the field value from the PropertyAccessor.
 * @see #getPropertyAccessor()
 */
@Override
@Nullable
protected Object getActualFieldValue(String field) {
  return getPropertyAccessor().getPropertyValue(field);
}

/**
 * Return the underlying PropertyAccessor of this binder's BindingResult.
 */
protected ConfigurablePropertyAccessor getPropertyAccessor() {
  return getInternalBindingResult().getPropertyAccessor();
}

/**
 * Returns the underlying PropertyAccessor.
 * @see #getPropertyAccessor()
 */
@Override
public PropertyEditorRegistry getPropertyEditorRegistry() {
  return (getTarget() != null ? getPropertyAccessor() : null);
}

/**
 * Determines the field type from the property type.
 * @see #getPropertyAccessor()
 */
@Override
@Nullable
public Class<?> getFieldType(@Nullable String field) {
  return (getTarget() != null ? getPropertyAccessor().getPropertyType(fixedField(field)) :
      super.getFieldType(field));
}

public void initConversion(ConversionService conversionService) {
  Assert.notNull(conversionService, "ConversionService must not be null");
  this.conversionService = conversionService;
  if (getTarget() != null) {
    getPropertyAccessor().setConversionService(conversionService);
  }
}

/**
 * Retrieve the custom PropertyEditor for the given field, if any.
 * @param fixedField the fully qualified field name
 * @return the custom PropertyEditor, or {@code null}
 */
@Nullable
protected PropertyEditor getCustomEditor(String fixedField) {
  Class<?> targetType = getPropertyAccessor().getPropertyType(fixedField);
  PropertyEditor editor = getPropertyAccessor().findCustomEditor(targetType, fixedField);
  if (editor == null) {
    editor = BeanUtils.findEditorByConvention(targetType);
  }
  return editor;
}

/**
 * Return the underlying TypeConverter of this binder's BindingResult.
 */
protected PropertyEditorRegistry getPropertyEditorRegistry() {
  if (getTarget() != null) {
    return getInternalBindingResult().getPropertyAccessor();
  }
  else {
    return getSimpleTypeConverter();
  }
}

/**
 * Return the underlying TypeConverter of this binder's BindingResult.
 */
protected TypeConverter getTypeConverter() {
  if (getTarget() != null) {
    return getInternalBindingResult().getPropertyAccessor();
  }
  else {
    return getSimpleTypeConverter();
  }
}

/**
 * Determines the field type from the property type.
 * @see #getPropertyAccessor()
 */
@Override
@Nullable
public Class<?> getFieldType(@Nullable String field) {
  return (getTarget() != null ? getPropertyAccessor().getPropertyType(fixedField(field)) :
      super.getFieldType(field));
}

/**
 * Return the underlying TypeConverter of this binder's BindingResult.
 */
protected TypeConverter getTypeConverter() {
  if (getTarget() != null) {
    return getInternalBindingResult().getPropertyAccessor();
  }
  else {
    return getSimpleTypeConverter();
  }
}

/**
 * Return the underlying TypeConverter of this binder's BindingResult.
 */
protected PropertyEditorRegistry getPropertyEditorRegistry() {
  if (getTarget() != null) {
    return getInternalBindingResult().getPropertyAccessor();
  }
  else {
    return getSimpleTypeConverter();
  }
}

/**
 * This implementation exposes a PropertyEditor adapter for a Formatter,
 * if applicable.
 */
@Override
@Nullable
public PropertyEditor findEditor(@Nullable String field, @Nullable Class<?> valueType) {
  Class<?> valueTypeForLookup = valueType;
  if (valueTypeForLookup == null) {
    valueTypeForLookup = getFieldType(field);
  }
  PropertyEditor editor = super.findEditor(field, valueTypeForLookup);
  if (editor == null && this.conversionService != null) {
    TypeDescriptor td = null;
    if (field != null && getTarget() != null) {
      TypeDescriptor ptd = getPropertyAccessor().getPropertyTypeDescriptor(fixedField(field));
      if (ptd != null && (valueType == null || valueType.isAssignableFrom(ptd.getType()))) {
        td = ptd;
      }
    }
    if (td == null) {
      td = TypeDescriptor.valueOf(valueTypeForLookup);
    }
    if (this.conversionService.canConvert(TypeDescriptor.valueOf(String.class), td)) {
      editor = new ConvertingPropertyEditorAdapter(this.conversionService, td);
    }
  }
  return editor;
}

/**
 * Formats the field value based on registered PropertyEditors.
 * @see #getCustomEditor
 */
@Override
protected Object formatFieldValue(String field, @Nullable Object value) {
  String fixedField = fixedField(field);
  // Try custom editor...
  PropertyEditor customEditor = getCustomEditor(fixedField);
  if (customEditor != null) {
    customEditor.setValue(value);
    String textValue = customEditor.getAsText();
    // If the PropertyEditor returned null, there is no appropriate
    // text representation for this value: only use it if non-null.
    if (textValue != null) {
      return textValue;
    }
  }
  if (this.conversionService != null) {
    // Try custom converter...
    TypeDescriptor fieldDesc = getPropertyAccessor().getPropertyTypeDescriptor(fixedField);
    TypeDescriptor strDesc = TypeDescriptor.valueOf(String.class);
    if (fieldDesc != null && this.conversionService.canConvert(fieldDesc, strDesc)) {
      return this.conversionService.convert(value, fieldDesc, strDesc);
    }
  }
  return value;
}

/**
 * Formats the field value based on registered PropertyEditors.
 * @see #getCustomEditor
 */
@Override
protected Object formatFieldValue(String field, @Nullable Object value) {
  String fixedField = fixedField(field);
  // Try custom editor...
  PropertyEditor customEditor = getCustomEditor(fixedField);
  if (customEditor != null) {
    customEditor.setValue(value);
    String textValue = customEditor.getAsText();
    // If the PropertyEditor returned null, there is no appropriate
    // text representation for this value: only use it if non-null.
    if (textValue != null) {
      return textValue;
    }
  }
  if (this.conversionService != null) {
    // Try custom converter...
    TypeDescriptor fieldDesc = getPropertyAccessor().getPropertyTypeDescriptor(fixedField);
    TypeDescriptor strDesc = TypeDescriptor.valueOf(String.class);
    if (fieldDesc != null && this.conversionService.canConvert(fieldDesc, strDesc)) {
      return this.conversionService.convert(value, fieldDesc, strDesc);
    }
  }
  return value;
}

@Test // SPR-15009
public void testSetCustomMessageCodesResolverBeforeInitializeBindingResultForBeanPropertyAccess() {
  TestBean testBean = new TestBean();
  DataBinder binder = new DataBinder(testBean, "testBean");
  DefaultMessageCodesResolver messageCodesResolver = new DefaultMessageCodesResolver();
  messageCodesResolver.setPrefix("errors.");
  binder.setMessageCodesResolver(messageCodesResolver);
  binder.setAutoGrowCollectionLimit(512); // allow configuration after set a MessageCodesResolver
  binder.initBeanPropertyAccess();
  MutablePropertyValues mpv = new MutablePropertyValues();
  mpv.add("age", "invalid");
  binder.bind(mpv);
  assertEquals("errors.typeMismatch", binder.getBindingResult().getFieldError("age").getCode());
  assertEquals(512, BeanWrapper.class.cast(binder.getInternalBindingResult().getPropertyAccessor()).getAutoGrowCollectionLimit());
}