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package org.openecomp.sdc.be.view;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* A class that is then responsible for converting a message payload with a dedicated mixin from an instance of a specific Java type into a json representation.
*/
@Provider
@Produces(MediaType.APPLICATION_JSON)
public class MixinModelWriter implements MessageBodyWriter<Object> {
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return hasResponseViewAndMixinTargetAnnotations(annotations) && mediaType.isCompatible(MediaType.APPLICATION_JSON_TYPE);
}
@Override
public long getSize(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return -1;
}
@Override
public void writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
List<MixinSourceTarget> mixinSourceTargets = getMixinSourceTarget(annotations);
mixinSourceTargets.forEach(mixinSourceTarget -> objectMapper.addMixIn(mixinSourceTarget.getTarget(), mixinSourceTarget.getMixinSource()));
objectMapper.writeValue(entityStream, object);
}
private List<MixinSourceTarget> getMixinSourceTarget(Annotation[] annotations) {
return Stream.of(annotations)
.filter(annotation -> annotation.annotationType().equals(ResponseView.class))
.map(annotation -> (ResponseView) annotation)
.flatMap(responseView -> Stream.of(responseView.mixin()))
.map(mixinClass -> new MixinSourceTarget(mixinClass, mixinClass.getAnnotation(MixinTarget.class).target()))
.collect(Collectors.toList());
}
private boolean hasResponseViewAndMixinTargetAnnotations(Annotation[] annotations) {
return Stream.of(annotations)
.filter(annotation -> annotation.annotationType().equals(ResponseView.class))
.map(annotation -> (ResponseView) annotation)
.flatMap(responseView -> Stream.of(responseView.mixin()))
.anyMatch(mixinClass -> Objects.nonNull(mixinClass.getAnnotation(MixinTarget.class)));
}
}
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