package de.jungblut.clustering.model;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
import de.jungblut.math.DoubleVector;
import de.jungblut.math.dense.DenseDoubleVector;
/**
* Writable and comparable wrapper for dense vectors. <br/>
*
* @author thomas.jungblut
* @deprecated use de.jungblut.writable.VectorWritable instead, but it is not
* compatible to this class here.
*
*/
@Deprecated
public final class VectorWritable implements WritableComparable<VectorWritable> {
private DoubleVector vector;
public VectorWritable() {
super();
}
public VectorWritable(VectorWritable v) {
this.vector = v.getVector();
}
public VectorWritable(DenseDoubleVector v) {
this.vector = v;
}
/*
* Some oldschool compatibility convenience constructors
*/
public VectorWritable(double x) {
this.vector = new DenseDoubleVector(new double[] { x });
}
public VectorWritable(double x, double y) {
this.vector = new DenseDoubleVector(new double[] { x, y });
}
public VectorWritable(double[] arr) {
this.vector = new DenseDoubleVector(arr);
}
@Override
public final void write(DataOutput out) throws IOException {
writeVector(this.vector, out);
}
@Override
public final void readFields(DataInput in) throws IOException {
this.vector = readVector(in);
}
@Override
public final int compareTo(VectorWritable o) {
return compareVector(this, o);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((vector == null) ? 0 : vector.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
VectorWritable other = (VectorWritable) obj;
if (vector == null) {
if (other.vector != null)
return false;
} else if (!vector.equals(other.vector))
return false;
return true;
}
/**
* @return the vector
*/
public DoubleVector getVector() {
return vector;
}
@Override
public String toString() {
return vector.toString();
}
public static void writeVector(DoubleVector vector, DataOutput out)
throws IOException {
out.writeInt(vector.getLength());
for (int i = 0; i < vector.getDimension(); i++) {
out.writeDouble(vector.get(i));
}
}
public static DoubleVector readVector(DataInput in) throws IOException {
final int length = in.readInt();
DoubleVector vector = new DenseDoubleVector(length);
for (int i = 0; i < length; i++) {
vector.set(i, in.readDouble());
}
return vector;
}
public static int compareVector(VectorWritable a, VectorWritable o) {
return compareVector(a.getVector(), o.getVector());
}
public static int compareVector(DoubleVector a, DoubleVector o) {
DoubleVector subtract = a.subtract(o);
return (int) subtract.sum();
}
public static VectorWritable wrap(DenseDoubleVector a) {
return new VectorWritable(a);
}
}