Examples of org.springframework.core.convert.converter.GenericConverter

Package org.springframework.core.convert.converter

Examples of org.springframework.core.convert.converter.GenericConverter

org.springframework.core.convert.converter.GenericConverter
Generic converter interface for converting between two or more types.
This is the most flexible of the Converter SPI interfaces, but also the most complex. It is flexible in that a GenericConverter may support converting between multiple source/target type pairs (see {@link #getConvertibleTypes()}. In addition, GenericConverter implementations have access to source/target {@link TypeDescriptor field context} during the type conversion process.This allows for resolving source and target field metadata such as annotations and generics information, which can be used influence the conversion logic.
This interface should generally not be used when the simpler {@link Converter} or{@link ConverterFactory} interfaces are sufficient.
Implementations may additionally implement {@link ConditionalConverter}. @author Keith Donald @author Juergen Hoeller @since 3.0 @see TypeDescriptor @see Converter @see ConverterFactory @see ConditionalConverter


    @SuppressWarnings("unchecked")
    public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
      AnnotationConverterKey converterKey =
          new AnnotationConverterKey(sourceType.getAnnotation(annotationType), sourceType.getObjectType());
      GenericConverter converter = cachedPrinters.get(converterKey);
      if (converter == null) {
        Printer<?> printer = annotationFormatterFactory.getPrinter(
            converterKey.getAnnotation(), converterKey.getFieldType());
        converter = new PrinterConverter(fieldType, printer, FormattingConversionService.this);
        cachedPrinters.put(converterKey, converter);
      }
      return converter.convert(source, sourceType, targetType);
    }

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    @SuppressWarnings("unchecked")
    public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
      AnnotationConverterKey converterKey =
          new AnnotationConverterKey(targetType.getAnnotation(annotationType), targetType.getObjectType());
      GenericConverter converter = cachedParsers.get(converterKey);
      if (converter == null) {
        Parser<?> parser = annotationFormatterFactory.getParser(
            converterKey.getAnnotation(), converterKey.getFieldType());
        converter = new ParserConverter(fieldType, parser, FormattingConversionService.this);
        cachedParsers.put(converterKey, converter);
      }
      return converter.convert(source, sourceType, targetType);
    }

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      throw new IllegalArgumentException("The targetType to convert to cannot be null");
    }
    if (sourceType == null) {
      return true;
    }
    GenericConverter converter = getConverter(sourceType, targetType);
    return (converter != null);
  }

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    }
    if (source != null && !sourceType.getObjectType().isInstance(source)) {
      throw new IllegalArgumentException("The source to convert from must be an instance of " +
          sourceType + "; instead it was a " + source.getClass().getName());
    }
    GenericConverter converter = getConverter(sourceType, targetType);
    if (converter != null) {
      Object result = ConversionUtils.invokeConverter(converter, source, sourceType, targetType);
      return handleResult(sourceType, targetType, result);
    }
    else {

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   * @return the generic converter that will perform the conversion, or <code>null</code> if no suitable converter was found
   * @see #getDefaultConverter(TypeDescriptor, TypeDescriptor)
   */
  protected GenericConverter getConverter(TypeDescriptor sourceType, TypeDescriptor targetType) {
    ConverterCacheKey key = new ConverterCacheKey(sourceType, targetType);
    GenericConverter converter = this.converterCache.get(key);
    if (converter != null) {
      return (converter != NO_MATCH ? converter : null);
    }
    else {
      converter = findConverterForClassPair(sourceType, targetType);

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      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(sourceObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        Map<Class<?>, MatchableConverters> converters = getTargetConvertersForSource(currentClass);
        GenericConverter converter = getMatchingConverterForTarget(sourceType, targetType, converters);
        if (converter != null) {
          return converter;
        }
        Class<?>[] interfaces = currentClass.getInterfaces();
        for (Class<?> ifc : interfaces) {
          classQueue.addFirst(ifc);
        }
      }
      Map<Class<?>, MatchableConverters> objectConverters = getTargetConvertersForSource(Object.class);
      return getMatchingConverterForTarget(sourceType, targetType, objectConverters);
    }
    else if (sourceObjectType.isArray()) {
      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(sourceObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        Map<Class<?>, MatchableConverters> converters = getTargetConvertersForSource(currentClass);
        GenericConverter converter = getMatchingConverterForTarget(sourceType, targetType, converters);
        if (converter != null) {
          return converter;
        }
        Class<?> componentType = ClassUtils.resolvePrimitiveIfNecessary(currentClass.getComponentType());
        if (componentType.getSuperclass() != null) {
          classQueue.addFirst(Array.newInstance(componentType.getSuperclass(), 0).getClass());
        }
        else if (componentType.isInterface()) {
          classQueue.addFirst(Object[].class);
        }
      }
      return null;
    }
    else {
      HashSet<Class<?>> interfaces = new LinkedHashSet<Class<?>>();
      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(sourceObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        Map<Class<?>, MatchableConverters> converters = getTargetConvertersForSource(currentClass);
        GenericConverter converter = getMatchingConverterForTarget(sourceType, targetType, converters);
        if (converter != null) {
          return converter;
        }
        Class<?> superClass = currentClass.getSuperclass();
        if (superClass != null && superClass != Object.class) {
          classQueue.addFirst(superClass);
        }
        for (Class<?> interfaceType : currentClass.getInterfaces()) {
          addInterfaceHierarchy(interfaceType, interfaces);
        }
      }
      for (Class<?> interfaceType : interfaces) {
        Map<Class<?>, MatchableConverters> converters = getTargetConvertersForSource(interfaceType);
        GenericConverter converter = getMatchingConverterForTarget(sourceType, targetType, converters);
        if (converter != null) {
          return converter;
        }
      }
      Map<Class<?>, MatchableConverters> objectConverters = getTargetConvertersForSource(Object.class);

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      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(targetObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        MatchableConverters matchable = converters.get(currentClass);
        GenericConverter converter = matchConverter(matchable, sourceType, targetType);
        if (converter != null) {
          return converter;
        }
        Class<?>[] interfaces = currentClass.getInterfaces();
        for (Class<?> ifc : interfaces) {
          classQueue.addFirst(ifc);
        }
      }
      return matchConverter(converters.get(Object.class), sourceType, targetType);
    }
    else if (targetObjectType.isArray()) {
      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(targetObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        MatchableConverters matchable = converters.get(currentClass);
        GenericConverter converter = matchConverter(matchable, sourceType, targetType);
        if (converter != null) {
          return converter;
        }
        Class<?> componentType = ClassUtils.resolvePrimitiveIfNecessary(currentClass.getComponentType());
        if (componentType.getSuperclass() != null) {
          classQueue.addFirst(Array.newInstance(componentType.getSuperclass(), 0).getClass());
        }
        else if (componentType.isInterface()) {
          classQueue.addFirst(Object[].class);
        }
      }
      return null;
    }
    else {
      Set<Class<?>> interfaces = new LinkedHashSet<Class<?>>();
      LinkedList<Class<?>> classQueue = new LinkedList<Class<?>>();
      classQueue.addFirst(targetObjectType);
      while (!classQueue.isEmpty()) {
        Class<?> currentClass = classQueue.removeLast();
        MatchableConverters matchable = converters.get(currentClass);
        GenericConverter converter = matchConverter(matchable, sourceType, targetType);
        if (converter != null) {
          return converter;
        }
        Class<?> superClass = currentClass.getSuperclass();
        if (superClass != null && superClass != Object.class) {
          classQueue.addFirst(superClass);
        }
        for (Class<?> interfaceType : currentClass.getInterfaces()) {
          addInterfaceHierarchy(interfaceType, interfaces);
        }
      }
      for (Class<?> interfaceType : interfaces) {
        MatchableConverters matchable = converters.get(interfaceType);
        GenericConverter converter = matchConverter(matchable, sourceType, targetType);
        if (converter != null) {
          return converter;
        }
      }
      return matchConverter(converters.get(Object.class), sourceType, targetType);

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        target.addAll(sourceCollection);
        return target;
      }
    }
    Collection target = CollectionFactory.createCollection(targetType.getType(), sourceCollection.size());
    GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetElementType);
    if (converter == null) {
      throw new ConverterNotFoundException(sourceElementType, targetElementType);
    }
    for (Object element : sourceCollection) {
      target.add(ConversionUtils.invokeConverter(converter, element, sourceElementType, targetElementType));

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          i++;
        }
        return string.toString();
      }
      else {
        GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetType);
        if (converter == null) {
          throw new ConverterNotFoundException(sourceElementType, targetType);
        }
        StringBuilder string = new StringBuilder();
        int i = 0;

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      if (ann == null) {
        throw new IllegalStateException(
            "Expected [" + this.annotationType.getName() + "] to be present on " + sourceType);
      }
      AnnotationConverterKey converterKey = new AnnotationConverterKey(ann, sourceType.getObjectType());
      GenericConverter converter = cachedPrinters.get(converterKey);
      if (converter == null) {
        Printer<?> printer = this.annotationFormatterFactory.getPrinter(
            converterKey.getAnnotation(), converterKey.getFieldType());
        converter = new PrinterConverter(this.fieldType, printer, FormattingConversionService.this);
        cachedPrinters.put(converterKey, converter);
      }
      return converter.convert(source, sourceType, targetType);
    }

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