/**
* Returns the list of variants that can be converted from a given object class.
*
* @param sourceClass The source class.
* @param targetVariant The expected representation metadata.
* @return The list of variants that can be converted.
*/
public static List<VariantInfo> getVariants(Class<?> sourceClass, Variant targetVariant) {
List<VariantInfo> result = null;
List<VariantInfo> helperVariants = null;
for (ConverterHelper ch : Engine.getInstance().getRegisteredConverters()) {
// List of variants that can be converted from the source class
helperVariants = ch.getVariants(sourceClass);
if (helperVariants != null) {
// Loop over the variants list
for (VariantInfo helperVariant : helperVariants) {
if (targetVariant == null) {
result = addVariant(result, helperVariant);
} else if (helperVariant.includes(targetVariant)) {
// Detected a more generic variant, but still consider
// the conversion is possible to the target variant.
result = addVariant(result, new VariantInfo(targetVariant.getMediaType()));
} else if (targetVariant.includes(helperVariant)) {
// Detected a more specific variant, but still consider
// the conversion is possible to the target variant.
result = addVariant(result, helperVariant);
}
}
}
}
return result;
}
@Override
public List<Class<?>> getObjectClasses(Variant source) {
List<Class<?>> result = null;
if (VARIANT_JSON.isCompatible(source)) {
result = addObjectClass(result, Object.class);
result = addObjectClass(result, JacksonRepresentation.class);
}
return result;
}
@Override
public <T> float score(Representation source, Class<T> target, Resource resource) {
float result = -1.0F;
if (source instanceof JacksonRepresentation<?>) {
result = 1.0F;
} else if ((target != null) && JacksonRepresentation.class.isAssignableFrom(target)) {
result = 1.0F;
} else if (VARIANT_JSON.isCompatible(source)) {
result = 0.8F;
}
return result;
}
private String presentations(SkysailResponse<List<?>> skysailResponse) {
Set<String> mediaTypes = new HashSet<String>();
List<ConverterHelper> registeredConverters = Engine.getInstance().getRegisteredConverters();
for (ConverterHelper ch : registeredConverters) {
List<VariantInfo> variants = ch.getVariants(skysailResponse.getClass());
if (variants == null) {
continue;
}
for (VariantInfo variantInfo : variants) {
mediaTypes.add(variantInfo.getMediaType().getSubType());
}
}
StringBuilder sb = new StringBuilder();
sb.append("<ul>\n");
for (String mediaType : mediaTypes) {
sb.append("<li><a href='?media=").append(mediaType).append("'>");
sb.append(mediaType).append("</a></li>\n");
}
// sb.append("<li><a href='?media=json'>Json</a></li>\n");
sb.append("</ul>\n");
return sb.toString();
}