co.cask.cdap.test.internal.MockResponder.java Source code

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Here is the source code for co.cask.cdap.test.internal.MockResponder.java

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/*
 * 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.cdap.test.internal;

import co.cask.http.HttpResponder;
import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
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.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferInputStream;
import org.jboss.netty.buffer.ChannelBufferOutputStream;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;

import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;

/**
 * A mock implementation of {@link HttpResponder} that only record the response status.
 */
public final class MockResponder implements HttpResponder {
    private HttpResponseStatus status = null;
    private ChannelBuffer content = null;
    private static final Gson GSON = new Gson();

    public HttpResponseStatus getStatus() {
        return status;
    }

    public <T> T decodeResponseContent(TypeToken<T> type) {
        JsonReader jsonReader = new JsonReader(
                new InputStreamReader(new ChannelBufferInputStream(content), Charsets.UTF_8));
        return GSON.fromJson(jsonReader, type.getType());
    }

    @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) {
        this.status = status;
    }

    @Override
    public void sendStatus(HttpResponseStatus status) {
        sendContent(status, null, null, ImmutableMultimap.<String, String>of());
    }

    @Override
    public void sendStatus(HttpResponseStatus status, Multimap<String, String> headers) {
        sendContent(status, null, null, headers);
    }

    @Override
    public void sendByteArray(HttpResponseStatus status, byte[] bytes, Multimap<String, String> headers) {
        ChannelBuffer channelBuffer = ChannelBuffers.wrappedBuffer(bytes);
        sendContent(status, channelBuffer, "application/octet-stream", headers);
    }

    @Override
    public void sendBytes(HttpResponseStatus status, ByteBuffer buffer, Multimap<String, String> headers) {
        sendContent(status, ChannelBuffers.wrappedBuffer(buffer), "application/octet-stream", headers);
    }

    @Override
    public void sendError(HttpResponseStatus status, String errorMessage) {
        Preconditions.checkArgument(!status.equals(HttpResponseStatus.OK),
                "Response status cannot be OK for errors");

        ChannelBuffer errorContent = ChannelBuffers.wrappedBuffer(Charsets.UTF_8.encode(errorMessage));
        sendContent(status, errorContent, "text/plain; charset=utf-8", ImmutableMultimap.<String, String>of());
    }

    @Override
    public void sendChunkStart(HttpResponseStatus status, Multimap<String, String> headers) {
        this.status = status;
    }

    @Override
    public void sendChunk(ChannelBuffer content) {
        // No-op
    }

    @Override
    public void sendChunkEnd() {
        // No-op
    }

    @Override
    public void sendContent(HttpResponseStatus status, ChannelBuffer content, String contentType,
            Multimap<String, String> headers) {
        if (content != null) {
            this.content = content;
        }
        this.status = status;
    }

    @Override
    public void sendFile(File file, Multimap<String, String> headers) {
        this.status = HttpResponseStatus.OK;
    }
}