/**
* 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.avro.tool;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.io.BinaryEncoder;
import org.apache.avro.io.JsonDecoder;
/** Tool to convert JSON data into the binary form. */
public class JsonToBinaryFragmentTool implements Tool {
@Override
public int run(InputStream stdin, PrintStream out, PrintStream err,
List<String> args) throws Exception {
if (args.size() != 2) {
err.println("Expected 2 arguments: schema json_data_file");
err.println("Use '-' as json_data_file for stdin.");
return 1;
}
Schema schema = Schema.parse(args.get(0));
InputStream input;
boolean needsClosing;
if (args.get(1).equals("-")) {
input = stdin;
needsClosing = false;
} else {
input = new FileInputStream(args.get(1));
needsClosing = true;
}
try {
GenericDatumReader<Object> reader =
new GenericDatumReader<Object>(schema);
Object datum = reader.read(null, new JsonDecoder(schema, input));
GenericDatumWriter<Object> writer =
new GenericDatumWriter<Object>(schema);
writer.write(datum, new BinaryEncoder(out));
out.flush();
} finally {
if (needsClosing) {
input.close();
}
}
return 0;
}
@Override
public String getName() {
return "jsontofrag";
}
@Override
public String getShortDescription() {
return "Renders a JSON-encoded Avro datum as binary.";
}
}