/*
* Copyright © 2014 Cask Data, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package co.cask.http;
import com.google.common.base.Charsets;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import com.google.gson.Gson;
import com.google.gson.stream.JsonWriter;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferOutputStream;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import javax.annotation.Nullable;
/**
* Base implementation of {@link HttpResponder} to simplify child implementations.
*/
public abstract class AbstractHttpResponder implements HttpResponder {
private static final Gson GSON = new Gson();
@Override
public void sendJson(HttpResponseStatus status, Object object) {
sendJson(status, object, object.getClass());
}
@Override
public void sendJson(HttpResponseStatus status, Object object, Type type) {
sendJson(status, object, type, GSON);
}
@Override
public void sendJson(HttpResponseStatus status, Object object, Type type, Gson gson) {
try {
ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(channelBuffer),
Charsets.UTF_8));
try {
gson.toJson(object, type, jsonWriter);
} finally {
jsonWriter.close();
}
sendContent(status, channelBuffer, "application/json", ImmutableMultimap.<String, String>of());
} catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
public void sendString(HttpResponseStatus status, String data) {
if (data == null) {
sendStatus(status);
return;
}
try {
ChannelBuffer channelBuffer = ChannelBuffers.wrappedBuffer(Charsets.UTF_8.encode(data));
sendContent(status, channelBuffer, "text/plain; charset=utf-8", ImmutableMultimap.<String, String>of());
} catch (Exception e) {
throw Throwables.propagate(e);
}
}
@Override
public void sendStatus(HttpResponseStatus status) {
sendContent(status, null, null, ImmutableMultimap.<String, String>of());
}
@Override
public void sendStatus(HttpResponseStatus status, @Nullable Multimap<String, String> headers) {
sendContent(status, null, null, headers);
}
@Override
public void sendByteArray(HttpResponseStatus status, byte[] bytes, @Nullable Multimap<String, String> headers) {
ChannelBuffer channelBuffer = ChannelBuffers.wrappedBuffer(bytes);
sendContent(status, channelBuffer, "application/octet-stream", headers);
}
@Override
public void sendBytes(HttpResponseStatus status, ByteBuffer buffer, @Nullable Multimap<String, String> headers) {
sendContent(status, ChannelBuffers.wrappedBuffer(buffer), "application/octet-stream", headers);
}
@Override
public final void sendError(HttpResponseStatus status, String errorMessage) {
sendString(status, errorMessage);
}
}