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Declarative Machine Learning
/*
* 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.sysml.runtime.transform;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.apache.sysml.runtime.matrix.CSVReblockMR.OffsetCount;
import org.apache.sysml.runtime.util.UtilFunctions;
public class DistinctValue implements Writable, Serializable {
private static final long serialVersionUID = -8236705946336974836L;
private static final byte [] EMPTY_BYTES = new byte[0];
// word (distinct value)
private byte[] _bytes;
private int _length;
// count
private long _count;
public DistinctValue() {
_bytes = EMPTY_BYTES;
_length = 0;
_count = -1;
}
public DistinctValue(String w, long count) throws CharacterCodingException {
ByteBuffer bb = Text.encode(w, true);
_bytes = bb.array();
_length = bb.limit();
_count = count;
}
public DistinctValue(OffsetCount oc) throws CharacterCodingException {
this(oc.filename + "," + oc.fileOffset, oc.count);
}
public void reset() {
_bytes = EMPTY_BYTES;
_length = 0;
_count = -1;
}
public String getWord() {
return new String( _bytes, 0, _length, Charset.forName("UTF-8") );
}
public long getCount() {
return _count;
}
@Override
public void write(DataOutput out) throws IOException {
// write word
WritableUtils.writeVInt(out, _length);
out.write(_bytes, 0, _length);
// write count
out.writeLong(_count);
}
@Override
public void readFields(DataInput in) throws IOException {
// read word
_length = WritableUtils.readVInt(in);
_bytes = new byte[_length];
in.readFully(_bytes, 0, _length);
// read count
_count = in.readLong();
}
public OffsetCount getOffsetCount() {
String[] parts = getWord().split(",");
return new OffsetCount( parts[0],
UtilFunctions.parseToLong(parts[1]),
getCount() );
}
}