/**
* 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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.nio.ByteBuffer;
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.generic.GenericDatumWriter;
import static org.apache.avro.file.DataFileConstants.DEFLATE_CODEC;
/** Reads a text file into an Avro data file.
*
* Can accept a file name, and HDFS file URI, or stdin. Can write to a file
* name, an HDFS URI, or stdout.*/
public class FromTextTool implements Tool {
private static final String TEXT_FILE_SCHEMA =
"\"bytes\"";
@Override
public String getName() {
return "fromtext";
}
@Override
public String getShortDescription() {
return "Imports a text file into an avro data file.";
}
@Override
public int run(InputStream stdin, PrintStream out, PrintStream err,
List<String> args) throws Exception {
OptionParser p = new OptionParser();
OptionSpec<Integer> level = p.accepts("level", "compression level")
.withOptionalArg().ofType(Integer.class);
OptionSpec<String> codec = p.accepts("codec", "compression codec")
.withOptionalArg().ofType(String.class);
OptionSet opts = p.parse(args.toArray(new String[0]));
List<String> nargs = opts.nonOptionArguments();
if (nargs.size() != 2) {
err.println("Expected 2 args: from_file to_file (local filenames," +
" Hadoop URI's, or '-' for stdin/stdout");
p.printHelpOn(err);
return 1;
}
int compressionLevel = 1; // Default compression level
if (opts.hasArgument(level)) {
compressionLevel = level.value(opts);
}
String codecName = opts.hasArgument(codec)
? codec.value(opts)
: DEFLATE_CODEC;
CodecFactory codecFactory = codecName.equals(DEFLATE_CODEC)
? CodecFactory.deflateCodec(compressionLevel)
: CodecFactory.fromString(codecName);
BufferedInputStream inStream = Util.fileOrStdin(nargs.get(0), stdin);
BufferedOutputStream outStream = Util.fileOrStdout(nargs.get(1), out);
DataFileWriter<ByteBuffer> writer =
new DataFileWriter<ByteBuffer>(new GenericDatumWriter<ByteBuffer>());
writer.setCodec(codecFactory);
writer.create(Schema.parse(TEXT_FILE_SCHEMA), outStream);
ByteBuffer line = ByteBuffer.allocate(128);
boolean returnSeen = false;
byte[] buf = new byte[8192];
for (int end = inStream.read(buf); end != -1; end = inStream.read(buf)) {
for (int i = 0; i < end; i++) {
int b = buf[i] & 0xFF;
if (b == '\n') { // newline
System.out.println("Writing line = "+line.position());
line.flip();
writer.append(line);
line.clear();
returnSeen = false;
} else if (b == '\r') { // return
line.flip();
writer.append(line);
line.clear();
returnSeen = true;
} else {
if (line.position() == line.limit()) { // reallocate longer line
ByteBuffer tempLine = ByteBuffer.allocate(line.limit()*2);
line.flip();
tempLine.put(line);
line = tempLine;
}
line.put((byte)b);
returnSeen = false;
}
}
}
writer.close();
inStream.close();
return 0;
}
}