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package org.glassfish.json.jaxrs;

import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonReaderFactory;
import javax.json.JsonStructure;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

/**
 * JAX-RS MessageBodyReader for JsonStructure. This allows
 * JsonStructure, JsonArray and JsonObject to be a parameter of a
 * resource method.
 *
 * @author Jitendra Kotamraju
 * @author Blaise Doughan
 * @author Michal Gajdos
 */
@Provider
@Consumes({"application/json", "text/json", "*/*"})
public class JsonStructureBodyReader implements MessageBodyReader<JsonStructure> {
    private final JsonReaderFactory rf = Json.createReaderFactory(null);

    private static final String JSON = "json";
    private static final String PLUS_JSON = "+json";

    @Override
    public boolean isReadable(Class<?> aClass, Type type,
            Annotation[] annotations, MediaType mediaType) {
        return JsonStructure.class.isAssignableFrom(aClass) && supportsMediaType(mediaType);
    }

    /**
     * @return true for all media types of the pattern *&#47;json and
     * *&#47;*+json.
     */
    private static boolean supportsMediaType(final MediaType mediaType) {
        return mediaType.getSubtype().equals(JSON) || mediaType.getSubtype().endsWith(PLUS_JSON);
    }

    @Override
    public JsonStructure readFrom(Class<JsonStructure> jsonStructureClass,
            Type type, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> stringStringMultivaluedMap,
            InputStream inputStream) throws IOException, WebApplicationException {
		JsonReader reader = rf.createReader(inputStream);
		try {
			return reader.read();
		} finally {
			reader.close();	
		}
    }
}
