/*
* Copyright 2014 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.samples.apps.iosched.server.schedule.server.input.fetcher;
import com.google.appengine.api.utils.SystemProperty;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.samples.apps.iosched.server.schedule.Config;
import com.google.samples.apps.iosched.server.schedule.input.fetcher.EntityFetcher;
import com.google.samples.apps.iosched.server.schedule.input.fetcher.RemoteJsonHelper;
import com.google.samples.apps.iosched.server.schedule.server.cloudstorage.CloudFileManager;
import java.io.IOException;
import java.util.Arrays;
import java.util.Map;
import java.util.Map.Entry;
import java.util.logging.Logger;
/**
* EntityFetcher that fetches entities from a set of files stored in CloudStorage.
*/
public class CloudStorageRemoteFilesEntityFetcher implements EntityFetcher {
private static final Logger LOGGER = Logger.getLogger(CloudStorageRemoteFilesEntityFetcher.class.getName());
private CloudFileManager fileManager;
private String[] filenames;
private JsonObject object;
public CloudStorageRemoteFilesEntityFetcher(String... filenames) {
this.fileManager = new CloudFileManager();
this.filenames = filenames;
}
@Override
public JsonElement fetch(Enum<?> entityType, Map<String, String> params)
throws IOException {
// On the first call, read all the files
if (object == null) {
object = new JsonObject();
for (String filename: filenames) {
JsonObject obj = fileManager.readFileAsJsonObject(filename);
if (obj == null &&
SystemProperty.environment.value() == SystemProperty.Environment.Value.Development) {
// In the development server, cloud storage files cannot be directly accessed.
obj = RemoteJsonHelper.fetchJsonFromPublicURL(Config.CLOUD_STORAGE_BASE_URL + filename);
}
if (obj == null) {
LOGGER.warning("Could not find file "+filename);
} else {
for (Entry<String, JsonElement> entry: obj.entrySet()) {
object.add(entry.getKey(), entry.getValue());
}
}
}
}
return object.get(entityType.name());
}
@Override
public String toString() {
return "CloudStorageEntityFetcher(filenames="+Arrays.toString(filenames)+")";
}
}