it.newfammulfin.api.util.GsonReaderWriter.java Source code

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Here is the source code for it.newfammulfin.api.util.GsonReaderWriter.java

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package it.newfammulfin.api.util;

import it.newfammulfin.api.util.converters.MoneyConverter;
import it.newfammulfin.api.util.converters.CurrencyUnitConverter;
import it.newfammulfin.api.util.converters.KeyConverter;
import com.fatboyindustrial.gsonjodatime.LocalDateConverter;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.googlecode.objectify.Key;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.inject.Singleton;
import javax.ws.rs.Consumes;
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.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import org.joda.money.CurrencyUnit;
import org.joda.money.Money;
import org.joda.time.LocalDate;

/**
 *
 * @author eric
 */
@Provider
@Consumes(MediaType.APPLICATION_JSON)
@Singleton
public class GsonReaderWriter<T> implements MessageBodyReader<T>, MessageBodyWriter<T> {

    private final Gson gson;

    public GsonReaderWriter() {
        //should probably inject or something similar
        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.registerTypeAdapter(Money.class, new MoneyConverter());
        gsonBuilder.registerTypeAdapter(LocalDate.class, new LocalDateConverter());
        gsonBuilder.registerTypeAdapter(CurrencyUnit.class, new CurrencyUnitConverter());
        gsonBuilder.registerTypeAdapter(Key.class, new KeyConverter());
        gsonBuilder.enableComplexMapKeySerialization();
        gson = gsonBuilder.create();
    }

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return true;
    }

    @Override
    public T readFrom(Class<T> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders, InputStream inputStream)
            throws IOException, WebApplicationException {
        return gson.fromJson(new InputStreamReader(inputStream), type);
    }

    @Override
    public void writeTo(T t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {
        httpHeaders.get("Content-Type").add("charset=UTF-8");
        entityStream.write(gson.toJson(t).getBytes("UTF-8"));
    }

    @Override
    public long getSize(T t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return true;
    }

}