/* XXL: The eXtensible and fleXible Library for data processing
Copyright (C) 2000-2011 Prof. Dr. Bernhard Seeger
Head of the Database Research Group
Department of Mathematics and Computer Science
University of Marburg
Germany
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; If not, see <http://www.gnu.org/licenses/>.
http://code.google.com/p/xxl/
*/
package xxl.core.spatial.points;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Arrays;
import xxl.core.functions.AbstractFunction;
import xxl.core.functions.Function;
import xxl.core.io.Convertable;
import xxl.core.io.converters.Converter;
/**
* A Wrapper for Number[]-points that provides useful methods on points
* like e.g. a conversion mechanism.
*
* @see xxl.core.io.Convertable
* @see xxl.core.spatial.points.Point
* @see xxl.core.spatial.points.Points
* @see xxl.core.spatial.points.AbstractPoint
*/
public class NumberPoint<T extends Number> extends AbstractPoint implements Convertable, Cloneable {
/** A factory for DoublePoints.
*/
public Function<Object,NumberPoint<T>> getFactoryFunction(final Converter<T> converter) {
return new AbstractFunction<Object,NumberPoint<T>>(){
public NumberPoint<T> invoke(Object point){
return new NumberPoint<T>( (T[]) point );
}
public NumberPoint<T> invoke(Object object, Object dim){
return new NumberPoint<T>( ((Integer)dim).intValue(), converter );
}
};
}
/** Converts a DoublePoint into a NumberPoint<Double>
*
* @param doublePoint the DoublePoint to be converted
*/
public static NumberPoint<Double> doublePointToNumberPoint(DoublePoint doublePoint) {
double[] point = (double[])doublePoint.getPoint();
Double[] Dpoint = new Double[point.length];
for (int i=0; i<point.length; i++)
Dpoint[i] = point[i];
return new NumberPoint<Double>(Dpoint);
}
/** Converts a FixedPoint into a NumberPoint<Double>
*
* @param fixedPoint the FixedPoint to be converted
*/
public static NumberPoint<Long> doublePointToNumberPoint(FixedPoint fixedPoint) {
long[] point = (long[])fixedPoint.getPoint();
Long[] Lpoint = new Long[point.length];
for (int i=0; i<point.length; i++)
Lpoint[i] = point[i];
return new NumberPoint<Long>(Lpoint);
}
/** Converts a FloatPoint into a NumberPoint<Float>
*
* @param floatPoint the FloatPoint to be converted
*/
public static NumberPoint<Float> doublePointToNumberPoint(FloatPoint floatPoint) {
float[] point = (float[])floatPoint.getPoint();
Float[] Fpoint = new Float[point.length];
for (int i=0; i<point.length; i++)
Fpoint[i] = point[i];
return new NumberPoint<Float>(Fpoint);
}
/** The data to be wrapped.
*/
protected T[] point;
/** Converter for T objects
*/
Converter<T> converter;
/** Creates a new TypedPoint.
*
* @param point the primitive double-point to be wrapped.
*/
public NumberPoint(T[] point){
this.point = point;
}
/** Creates a new TypedPoint.
* (with coordinates (null,...,null)).
*
* @param dim dimensionality of the point
*/
public NumberPoint(int dim, Converter<T> converter){
this((T[])new Number[dim]);
this.converter = converter;
}
/** Returns a physical copy of this TypedPoint.
* @return returns a physical copy of this TypedPoint
*/
@Override
public Object clone(){
return new NumberPoint((T[])point.clone());
}
/** Returns (gets) the primitive data-point wrapped by this TypedPoint.
* @return returns the primitive data-point wrapped by this TypedPoint
*/
@Override
public Object getPoint(){
return point;
}
/** Returns the dimensionality of this TypedPoint.
* @return returns the dimensionality of this TypedPoint
*/
@Override
public int dimensions(){
return point.length;
}
/**
* Reads the state (the attributes) for an object of this class from
* the specified data input and restores the calling object. The state
* of the object before calling <tt>read</tt> will be lost.<br>
* The <tt>read</tt> method must read the values in the same sequence
* and with the same types as were written by <tt>write</tt>.
*
* @param dataInput the stream to read data from in order to restore
* the object.
* @throws IOException if I/O errors occur.
*/
@Override
public void read (DataInput dataInput) throws IOException {
if (converter!=null) {
for (int i=0; i< point.length; i++)
point[i] = converter.read(dataInput);
return;
}
if (theClass == null)
determineClass();
if (theClass.equals("Byte")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Byte(dataInput.readByte());
}
else if (theClass.equals("Double")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Double(dataInput.readDouble());
}
else if (theClass.equals("Float")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Float(dataInput.readFloat());
}
else if (theClass.equals("Integer")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Integer(dataInput.readInt());
}
else if (theClass.equals("Long")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Long(dataInput.readLong());
}
else if (theClass.equals("Short")) {
for (int i=0; i< point.length; i++)
point[i] = (T)new Short(dataInput.readShort());
}
else
throw new UnsupportedOperationException(theClass+" is not supported");
}
/**
* Writes the state (the attributes) of the calling object to the
* specified data output. This method should serialize the state of
* this object without calling another <tt>write</tt> method in order
* to prevent recursions.
*
* @param dataOutput the stream to write the state (the attributes) of
* the object to.
* @throws IOException includes any I/O exceptions that may occur.
*/
@Override
public void write (DataOutput dataOutput) throws IOException {
if (converter!=null) {
for (int i=0; i< point.length; i++)
converter.write(dataOutput, point[i]);
return;
}
if (theClass == null)
determineClass();
if (theClass.equals("Byte")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].byteValue());
}
else if (theClass.equals("Double")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].doubleValue());
}
else if (theClass.equals("Float")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].floatValue());
}
else if (theClass.equals("Integer")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].intValue());
}
else if (theClass.equals("Long")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].longValue());
}
else if (theClass.equals("Short")) {
for (int i=0; i< point.length; i++)
dataOutput.writeDouble(point[i].shortValue());
}
else
throw new UnsupportedOperationException(theClass+" is not supported");
}
private void determineClass() {
theClass = point[0].getClass().getSimpleName();
}
private String theClass;
/** Returns the coordinate of this DoublePoint in a given dimension <dim>.
*
* @param dim dimension to get coordinate
* @return returns the coordinate in given dimension
*/
@Override
public double getValue(int dim){
return point[dim].doubleValue();
}
/* (non-Javadoc)
* @see java.lang.Object#equals()
*/
@Override
public boolean equals(Object o) {
NumberPoint<T> p = (NumberPoint<T>)o;
return Arrays.equals(point, p.point);
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
double c = 0;
for (int i = 0; i < point.length; i++)
c += point[i].doubleValue();
return (int)c%1117;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString(){
StringBuffer sb = new StringBuffer("");
for(int i=0; i<point.length; i++){
sb.append(point[i]+"\t");
}
return sb.toString();
}
}