/*
* Copyright 2011-2013 the original author or authors.
*
* Licensed 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.springframework.data.hadoop.fs;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.util.ReflectionUtils;
/**
* Copy of FsShell$TextRecordInputStream allowing instantiation.
*
* @author Hadoop FsShell's authors
* @author Costin Leau
*/
class TextRecordInputStream extends InputStream {
SequenceFile.Reader r;
WritableComparable<?> key;
Writable val;
DataInputBuffer inbuf;
DataOutputBuffer outbuf;
@SuppressWarnings("deprecation")
public TextRecordInputStream(Path p, FileSystem fs, Configuration configuration) throws IOException {
r = new SequenceFile.Reader(fs, p, configuration);
key = ReflectionUtils.newInstance(r.getKeyClass().asSubclass(WritableComparable.class), configuration);
val = ReflectionUtils.newInstance(r.getValueClass().asSubclass(Writable.class), configuration);
inbuf = new DataInputBuffer();
outbuf = new DataOutputBuffer();
}
public int read() throws IOException {
int ret;
if (null == inbuf || -1 == (ret = inbuf.read())) {
if (!r.next(key, val)) {
return -1;
}
byte[] tmp = key.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\t');
tmp = val.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\n');
inbuf.reset(outbuf.getData(), outbuf.getLength());
outbuf.reset();
ret = inbuf.read();
}
return ret;
}
public void close() throws IOException {
r.close();
super.close();
}
}