/*
* 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.attachment;
import com.google.appengine.api.blobstore.BlobKey;
import com.google.appengine.api.datastore.Entity;
import com.google.inject.Inject;
import com.google.walkaround.util.server.appengine.AbstractDirectory;
import com.google.walkaround.util.server.appengine.CheckedDatastore;
import com.google.walkaround.util.server.appengine.DatastoreUtil;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.logging.Logger;
/**
* Attachment metadata
*
* @author danilatos@google.com (Daniel Danilatos)
*/
class MetadataDirectory extends AbstractDirectory<AttachmentMetadata, AttachmentId> {
@SuppressWarnings("unused")
private static final Logger log = Logger.getLogger(MetadataDirectory.class.getName());
private static final String BLOB_KEY_PROPERTY = "BlobKey";
private static final String JSON_METADATA_PROPERTY = "Metadata";
@Inject public MetadataDirectory(CheckedDatastore datastore) {
super(datastore, "AttachmentMetadataEntity");
}
@Override
protected AttachmentId getId(AttachmentMetadata e) {
return e.getId();
}
@Override
protected AttachmentMetadata parse(Entity e) {
AttachmentId id = new AttachmentId(e.getKey().getName());
String blobKey = DatastoreUtil.getOptionalProperty(e, BLOB_KEY_PROPERTY, String.class);
if (blobKey == null) {
// For some legacy data, the attachment id is the blob key.
log.info("Legacy attachment without blob key: " + id);
blobKey = id.getId();
}
String metadata = DatastoreUtil.getExistingProperty(e, JSON_METADATA_PROPERTY, String.class);
try {
return new AttachmentMetadata(id, new BlobKey(blobKey), new JSONObject(metadata));
} catch (JSONException je) {
throw new DatastoreUtil.InvalidPropertyException(e, JSON_METADATA_PROPERTY,
"Invalid json metadata: " + metadata, je);
}
}
@Override
protected void populateEntity(AttachmentMetadata in, Entity out) {
DatastoreUtil.setNonNullIndexedProperty(
out, BLOB_KEY_PROPERTY, in.getBlobKey().getKeyString());
DatastoreUtil.setNonNullUnindexedProperty(
out, JSON_METADATA_PROPERTY, in.getMetadataJsonString());
}
@Override
protected String serializeId(AttachmentId id) {
return id.getId();
}
}