/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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 com.google.walkaround.wave.server.rpc;
import com.google.inject.Inject;
import com.google.walkaround.slob.server.AccessDeniedException;
import com.google.walkaround.slob.server.ChangeDataSerializer;
import com.google.walkaround.slob.server.SlobStoreSelector;
import com.google.walkaround.slob.server.SlobNotFoundException;
import com.google.walkaround.slob.server.SlobStore;
import com.google.walkaround.slob.server.SlobStore.HistoryResult;
import com.google.walkaround.slob.shared.ChangeData;
import com.google.walkaround.slob.shared.SlobId;
import com.google.walkaround.util.server.servlet.AbstractHandler;
import com.google.walkaround.util.server.servlet.BadRequestException;
import com.google.walkaround.wave.server.ObjectSession;
import com.google.walkaround.wave.server.servlet.ServletUtil;
import com.google.walkaround.wave.shared.SharedConstants.Params;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.List;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author danilatos@google.com (Daniel Danilatos)
*/
public class HistoryHandler extends AbstractHandler {
@SuppressWarnings("unused")
private static final Logger log = Logger.getLogger(HistoryHandler.class.getName());
@Inject SlobStoreSelector storeSelector;
@Inject ObjectSession session;
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
try {
inner(req, resp);
} catch (JSONException e) {
throw new Error(e);
} catch (SlobNotFoundException e) {
throw new BadRequestException("Object not found or access denied", e);
} catch (AccessDeniedException e) {
throw new BadRequestException("Object not found or access denied", e);
}
}
private void inner(HttpServletRequest req, HttpServletResponse resp)
throws IOException, JSONException, SlobNotFoundException, AccessDeniedException {
long startVersion;
@Nullable Long endVersion;
try {
startVersion = Long.parseLong(requireParameter(req, Params.START_REVISION));
String endVersionString = req.getParameter(Params.END_REVISION);
if (endVersionString == null) {
endVersion = null;
} else {
endVersion = Long.parseLong(endVersionString);
}
} catch (NumberFormatException nfe) {
throw new BadRequestException(nfe);
}
SlobId objectId = session.getObjectId();
SlobStore store = storeSelector.get(session.getStoreType()).getSlobStore();
JSONObject result = new JSONObject();
HistoryResult history = store.loadHistory(objectId, startVersion, endVersion);
result.put("history", serializeHistory(startVersion, history.getData()));
result.put("more", history.hasMore());
resp.setContentType("application/json");
ServletUtil.writeJsonResult(resp.getWriter(), result.toString());
}
static JSONArray serializeHistory(long startVersion, List<ChangeData<String>> entries)
throws JSONException {
JSONArray history = new JSONArray();
int index = 0;
for (ChangeData<String> data : entries) {
history.put(index, ChangeDataSerializer.dataToClientJson(data, startVersion + index + 1));
index++;
}
return history;
}
}