/*
* 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 org.apache.beam.runners.dataflow.util;
import org.apache.avro.Schema;
import org.apache.beam.sdk.coders.AvroCoder;
/** A {@link CloudObjectTranslator} for {@link AvroCoder}. */
class AvroCoderCloudObjectTranslator implements CloudObjectTranslator<AvroCoder> {
private static final String TYPE_FIELD = "type";
private static final String SCHEMA_FIELD = "schema";
@Override
public CloudObject toCloudObject(AvroCoder target) {
CloudObject base = CloudObject.forClass(AvroCoder.class);
Structs.addString(base, SCHEMA_FIELD, target.getSchema().toString());
Structs.addString(base, TYPE_FIELD, target.getType().getName());
return base;
}
@Override
public AvroCoder<?> fromCloudObject(CloudObject cloudObject) {
Schema.Parser parser = new Schema.Parser();
String className = Structs.getString(cloudObject, TYPE_FIELD);
String schemaString = Structs.getString(cloudObject, SCHEMA_FIELD);
try {
Class<?> type = Class.forName(className);
Schema schema = parser.parse(schemaString);
return AvroCoder.of(type, schema);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException(e);
}
}
@Override
public Class<? extends AvroCoder> getSupportedClass() {
return AvroCoder.class;
}
@Override
public String cloudObjectClassName() {
return CloudObject.forClass(AvroCoder.class).getClassName();
}
}