/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 gobblin.metadata.types;
import java.io.IOException;
import gobblin.metadata.MetadataMerger;
/**
* Merges a set of GlobalMetadata objects that have been serialized as JSON together to
* create a final output.
*/
public class GlobalMetadataJsonMerger implements MetadataMerger<String> {
private GlobalMetadata mergedMetadata;
public GlobalMetadataJsonMerger() {
mergedMetadata = new GlobalMetadata();
}
@Override
public void update(String metadata) {
try {
GlobalMetadata parsedMetadata = GlobalMetadata.fromJson(metadata);
mergedMetadata.addAll(parsedMetadata);
} catch (IOException e) {
throw new IllegalArgumentException("Error parsing metadata", e);
}
}
@Override
public String getMergedMetadata() {
try {
return mergedMetadata.toJson();
} catch (IOException e) {
throw new AssertionError("Unexpected IOException serializing to JSON", e);
}
}
}