/* 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 xxl.core.io.Convertable;
import xxl.core.util.DistanceTo;
/**
* An interface for points. This is the base-type for all data
* that deals with points of arbitrary dimension.
*
* @see xxl.core.io.Convertable
* @see xxl.core.spatial.points.AbstractPoint
* @see xxl.core.spatial.points.DoublePoint
* @see xxl.core.spatial.points.FloatPoint
* @see xxl.core.spatial.points.Points
* @see xxl.core.spatial.rectangles.Rectangle
*
*/
public interface Point extends Convertable, Cloneable, DistanceTo<Point> {
/** Returns a physical copy of this Point.
*
* @return returns a physical copy of this Point
*/
public abstract Object clone();
/** Returns the dimensionality of this Point.
*
* @return returns the dimensionality of this Point
*/
public abstract int dimensions();
/**
* 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.
*/
public abstract void read (DataInput dataInput) throws IOException;
/**
* 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.
*/
public abstract void write (DataOutput dataOutput) throws IOException;
/** Returns the coordinate of this point in a given dimension <dim>.
*
* @param dim dimension to get coordinate
* @return returns the coordinate in given dimension
*/
public abstract double getValue(int dim);
/** Returns the internal Object representing the Point.
*
* @return returns the internal Object representing the Point
*/
public abstract Object getPoint();
/** Returns a string representation of this Point.
*
* @return returns a string representation of this Point.
*/
public abstract String toString();
}