/**
* 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.EOFException;
import java.io.InputStream;
import java.io.DataInputStream;
import java.io.PrintStream;
import java.util.List;
import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;
import org.apache.avro.Schema;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.io.DatumReader;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.JsonDecoder;
/** Reads new-line delimited JSON records and writers an Avro data file. */
public class DataFileWriteTool implements Tool {
@Override
public String getName() {
return "fromjson";
}
@Override
public String getShortDescription() {
return "Reads JSON records and writes an Avro data file.";
}
@Override
public int run(InputStream stdin, PrintStream out, PrintStream err,
List<String> args) throws Exception {
OptionParser p = new OptionParser();
OptionSpec<String> codec =
p.accepts("codec", "Compression codec")
.withRequiredArg()
.defaultsTo("null")
.ofType(String.class);
OptionSet opts = p.parse(args.toArray(new String[0]));
if (opts.nonOptionArguments().size() != 2) {
err.println("Expected 2 args: schema input_file");
p.printHelpOn(err);
return 1;
}
Schema schema = Schema.parse(args.get(0));
DatumReader<Object> reader = new GenericDatumReader<Object>(schema);
InputStream input = Util.fileOrStdin(args.get(1), stdin);
try {
DataInputStream din = new DataInputStream(input);
DataFileWriter<Object> writer =
new DataFileWriter<Object>(new GenericDatumWriter<Object>());
writer.setCodec(CodecFactory.fromString(codec.value(opts)));
writer.create(schema, out);
Decoder decoder = new JsonDecoder(schema, din);
Object datum;
while (true) {
try {
datum = reader.read(null, decoder);
} catch (EOFException e) {
break;
}
writer.append(datum);
}
writer.close();
} finally {
if (input != stdin) {
input.close();
}
}
return 0;
}
}