Examples of org.springframework.core.convert.ConversionService.canConvert()

Package org.springframework.core.convert

Class org.springframework.core.convert.ConversionService

Examples of org.springframework.core.convert.ConversionService.canConvert()

org.springframework.core.convert.ConversionService.canConvert()
Returns true if objects of sourceType can be converted to targetType. If this method returns true, it means {@link #convert(Object,Class)} is capable of converting an instance of sourceType to targetType.Special note on collections, arrays, and maps types: For conversion between collection, array, and map types, this method will return 'true' even though a convert invocation may still generate a {@link ConversionException} if the underlying elements are not convertible.Callers are expected to handle this exceptional case when working with collections and maps. @param sourceType the source type to convert from (may be null if source is null) @param targetType the target type to convert to (required) @return true if a conversion can be performed, false if not @throws IllegalArgumentException if targetType is null

    DataBinder binder = binderFactory.createBinder(request, null, attributeName);
    ConversionService conversionService = binder.getConversionService();
    if (conversionService != null) {
      TypeDescriptor source = TypeDescriptor.valueOf(String.class);
      TypeDescriptor target = new TypeDescriptor(parameter);
      if (conversionService.canConvert(source, target)) {
        return binder.convertIfNecessary(sourceValue, parameter.getParameterType(), parameter);
      }
    }
    return null;
  }

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    // No custom editor but custom ConversionService specified?
    ConversionService conversionService = this.propertyEditorRegistry.getConversionService();
    if (editor == null && conversionService != null && convertedValue != null && typeDescriptor != null) {
      TypeDescriptor sourceTypeDesc = TypeDescriptor.forObject(newValue);
      TypeDescriptor targetTypeDesc = typeDescriptor;
      if (conversionService.canConvert(sourceTypeDesc, targetTypeDesc)) {
        try {
          return (T) conversionService.convert(convertedValue, sourceTypeDesc, targetTypeDesc);
        }
        catch (ConversionFailedException ex) {
          // fallback to default conversion logic below

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    DataBinder binder = binderFactory.createBinder(request, null, attributeName);
    ConversionService conversionService = binder.getConversionService();
    if (conversionService != null) {
      TypeDescriptor source = TypeDescriptor.valueOf(String.class);
      TypeDescriptor target = new TypeDescriptor(parameter);
      if (conversionService.canConvert(source, target)) {
        return binder.convertIfNecessary(sourceValue, parameter.getParameterType(), parameter);
      }
    }
    return null;
  }

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    // No custom editor but custom ConversionService specified?
    ConversionService conversionService = this.propertyEditorRegistry.getConversionService();
    if (editor == null && conversionService != null && convertedValue != null && typeDescriptor != null) {
      TypeDescriptor sourceTypeDesc = TypeDescriptor.forObject(newValue);
      TypeDescriptor targetTypeDesc = typeDescriptor;
      if (conversionService.canConvert(sourceTypeDesc, targetTypeDesc)) {
        try {
          return (T) conversionService.convert(convertedValue, sourceTypeDesc, targetTypeDesc);
        }
        catch (ConversionFailedException ex) {
          // fallback to default conversion logic below

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    // No custom editor but custom ConversionService specified?
    ConversionService conversionService = this.propertyEditorRegistry.getConversionService();
    if (editor == null && conversionService != null && convertedValue != null) {
      TypeDescriptor sourceTypeDesc = TypeDescriptor.forObject(convertedValue);
      if (conversionService.canConvert(sourceTypeDesc, typeDescriptor)) {
        return (T) conversionService.convert(convertedValue, sourceTypeDesc, typeDescriptor);
      }
    }


    // Value not of required type?

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            // A List of size 1 get's returned as the object at list[0].
            Object obj = results.get(0);
            if (obj.getClass() != targetType) {
              // I can't just return it as-is, I have to convert it first.
              ConversionService conv = getConversionService();
              if (conv.canConvert(obj.getClass(), targetType)) {
                return conv.convert(obj, targetType);
              } else {
                throw new DataAccessResourceFailureException(
                    "Can't find a converter to to convert " + obj
                        .getClass() + " returned from M/R job to required type " + targetType);

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        DataBinder binder = binderFactory.createBinder(request, null, attributeName);
        ConversionService conversionService = binder.getConversionService();
        if (conversionService != null) {
            TypeDescriptor source = TypeDescriptor.valueOf(String.class);
            TypeDescriptor target = new TypeDescriptor(parameter);
            if (conversionService.canConvert(source, target)) {
                return binder.convertIfNecessary(sourceValue, parameter.getParameterType(), parameter);
            }
        }
        return null;
    }

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    // No custom editor but custom ConversionService specified?
    ConversionService conversionService = this.propertyEditorRegistry.getConversionService();
    if (editor == null && conversionService != null && convertedValue != null && typeDescriptor != null) {
      TypeDescriptor sourceTypeDesc = TypeDescriptor.forObject(newValue);
      TypeDescriptor targetTypeDesc = typeDescriptor;
      if (conversionService.canConvert(sourceTypeDesc, targetTypeDesc)) {
        try {
          return (T) conversionService.convert(convertedValue, sourceTypeDesc, targetTypeDesc);
        }
        catch (ConversionFailedException ex) {
          // fallback to default conversion logic below

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    DataBinder binder = binderFactory.createBinder(request, null, attributeName);
    ConversionService conversionService = binder.getConversionService();
    if (conversionService != null) {
      TypeDescriptor source = TypeDescriptor.valueOf(String.class);
      TypeDescriptor target = new TypeDescriptor(parameter);
      if (conversionService.canConvert(source, target)) {
        return binder.convertIfNecessary(sourceValue, parameter.getParameterType(), parameter);
      }
    }
    return null;
  }

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  }


  @Test
  public void testWithConversionService() {
    ConversionService conversionService = new DefaultConversionService();
    assertTrue(conversionService.canConvert(String.class, MediaType.class));
    MediaType mediaType = MediaType.parseMediaType("application/xml");
    assertEquals(mediaType, conversionService.convert("application/xml", MediaType.class));
  }


  @Test

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