package io.katharsis.jackson.serializer;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import io.katharsis.resource.field.ResourceField;
import io.katharsis.resource.registry.ResourceRegistry;
import io.katharsis.response.LinkageContainer;
import io.katharsis.utils.BeanUtils;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
/**
* Serializes a single linkage object.
*
* @see LinkageContainer
*/
public class LinkageContainerSerializer extends JsonSerializer<LinkageContainer> {
private static final String TYPE_FIELD_NAME = "type";
private static final String ID_FIELD_NAME = "id";
private final ResourceRegistry resourceRegistry;
public LinkageContainerSerializer(ResourceRegistry resourceRegistry) {
this.resourceRegistry = resourceRegistry;
}
@Override
public void serialize(LinkageContainer linkageContainer, JsonGenerator gen, SerializerProvider provider) throws IOException {
gen.writeStartObject();
writeType(gen, linkageContainer.getRelationshipClass());
try {
writeId(gen, linkageContainer);
} catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
e.printStackTrace();
}
gen.writeEndObject();
}
private void writeType(JsonGenerator gen, Class<?> relationshipClass) throws IOException {
String resourceType = resourceRegistry.getResourceType(relationshipClass);
gen.writeObjectField(TYPE_FIELD_NAME, resourceType);
}
private static void writeId(JsonGenerator gen, LinkageContainer linkageContainer)
throws IllegalAccessException, InvocationTargetException, NoSuchMethodException, IOException {
ResourceField idField = linkageContainer.getRelationshipEntry().getResourceInformation().getIdField();
String sourceId = BeanUtils.getProperty(linkageContainer.getObjectItem(), idField.getUnderlyingName());
gen.writeObjectField(ID_FIELD_NAME, sourceId);
}
public Class<LinkageContainer> handledType() {
return LinkageContainer.class;
}
}