/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* 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 2.1 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.geom.impl;
import com.vividsolutions.jts.geom.*;
import java.lang.ref.SoftReference;
/**
* A {@link CoordinateSequence} implementation based on a packed arrays.
* In this implementation, {@link Coordinate}s returned by #toArray and #get are copies
* of the internal values.
* To change the actual values, use the provided setters.
* <p>
* For efficiency, created Coordinate arrays
* are cached using a soft reference.
* The cache is cleared each time the coordinate sequence contents are
* modified through a setter method.
*
* @version 1.7
*/
public abstract class PackedCoordinateSequence
implements CoordinateSequence
{
/**
* The dimensions of the coordinates hold in the packed array
*/
protected int dimension;
/**
* A soft reference to the Coordinate[] representation of this sequence.
* Makes repeated coordinate array accesses more efficient.
*/
protected SoftReference coordRef;
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getDimension()
*/
public int getDimension() {
return this.dimension;
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getCoordinate(int)
*/
public Coordinate getCoordinate(int i) {
Coordinate[] coords = getCachedCoords();
if(coords != null)
return coords[i];
else
return getCoordinateInternal(i);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getCoordinate(int)
*/
public Coordinate getCoordinateCopy(int i) {
return getCoordinateInternal(i);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getCoordinate(int)
*/
public void getCoordinate(int i, Coordinate coord) {
coord.x = getOrdinate(i, 0);
coord.y = getOrdinate(i, 1);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#toCoordinateArray()
*/
public Coordinate[] toCoordinateArray() {
Coordinate[] coords = getCachedCoords();
// testing - never cache
if (coords != null)
return coords;
coords = new Coordinate[size()];
for (int i = 0; i < coords.length; i++) {
coords[i] = getCoordinateInternal(i);
}
coordRef = new SoftReference(coords);
return coords;
}
/**
* @return
*/
private Coordinate[] getCachedCoords() {
if (coordRef != null) {
Coordinate[] coords = (Coordinate[]) coordRef.get();
if (coords != null) {
return coords;
} else {
// System.out.print("-");
coordRef = null;
return null;
}
} else {
// System.out.print("-");
return null;
}
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getX(int)
*/
public double getX(int index) {
return getOrdinate(index, 0);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getY(int)
*/
public double getY(int index) {
return getOrdinate(index, 1);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getOrdinate(int, int)
*/
public abstract double getOrdinate(int index, int ordinateIndex);
/**
* Sets the first ordinate of a coordinate in this sequence.
*
* @param index the coordinate index
* @param value the new ordinate value
*/
public void setX(int index, double value) {
coordRef = null;
setOrdinate(index, 0, value);
}
/**
* Sets the second ordinate of a coordinate in this sequence.
*
* @param index the coordinate index
* @param value the new ordinate value
*/
public void setY(int index, double value) {
coordRef = null;
setOrdinate(index, 1, value);
}
/**
* Returns a Coordinate representation of the specified coordinate, by always
* building a new Coordinate object
*
* @param index
* @return
*/
protected abstract Coordinate getCoordinateInternal(int index);
/**
* @see java.lang.Object#clone()
*/
public abstract Object clone();
/**
* Sets the ordinate of a coordinate in this sequence.
* <br>
* Warning: for performance reasons the ordinate index is not checked
* - if it is over dimensions you may not get an exception but a meaningless value.
*
* @param index
* the coordinate index
* @param ordinate
* the ordinate index in the coordinate, 0 based, smaller than the
* number of dimensions
* @param value
* the new ordinate value
*/
public abstract void setOrdinate(int index, int ordinate, double value);
/**
* Packed coordinate sequence implementation based on doubles
*/
public static class Double extends PackedCoordinateSequence {
/**
* The packed coordinate array
*/
double[] coords;
/**
* Builds a new packed coordinate sequence
*
* @param coords
* @param dimensions
*/
public Double(double[] coords, int dimensions) {
if (dimensions < 2) {
throw new IllegalArgumentException("Must have at least 2 dimensions");
}
if (coords.length % dimensions != 0) {
throw new IllegalArgumentException("Packed array does not contain "
+ "an integral number of coordinates");
}
this.dimension = dimensions;
this.coords = coords;
}
/**
* Builds a new packed coordinate sequence out of a float coordinate array
*
* @param coordinates
*/
public Double(float[] coordinates, int dimensions) {
this.coords = new double[coordinates.length];
this.dimension = dimensions;
for (int i = 0; i < coordinates.length; i++) {
this.coords[i] = coordinates[i];
}
}
/**
* Builds a new packed coordinate sequence out of a coordinate array
*
* @param coordinates
*/
public Double(Coordinate[] coordinates, int dimension) {
if (coordinates == null)
coordinates = new Coordinate[0];
this.dimension = dimension;
coords = new double[coordinates.length * this.dimension];
for (int i = 0; i < coordinates.length; i++) {
coords[i * this.dimension] = coordinates[i].x;
if (this.dimension >= 2)
coords[i * this.dimension + 1] = coordinates[i].y;
if (this.dimension >= 3)
coords[i * this.dimension + 2] = coordinates[i].z;
}
}
/**
* Builds a new packed coordinate sequence out of a coordinate array
*
* @param coordinates
*/
public Double(Coordinate[] coordinates) {
this(coordinates, 3);
}
/**
* Builds a new empty packed coordinate sequence of a given size and dimension
*
* @param coordinates
*/
public Double(int size, int dimension) {
this.dimension = dimension;
coords = new double[size * this.dimension];
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getCoordinate(int)
*/
public Coordinate getCoordinateInternal(int i) {
double x = coords[i * dimension];
double y = coords[i * dimension + 1];
double z = dimension == 2 ? Coordinate.NULL_ORDINATE : coords[i * dimension + 2];
return new Coordinate(x, y, z);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#size()
*/
public int size() {
return coords.length / dimension;
}
/**
* @see java.lang.Object#clone()
*/
public Object clone() {
double[] clone = new double[coords.length];
System.arraycopy(coords, 0, clone, 0, coords.length);
return new Double(clone, dimension);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getOrdinate(int, int)
* Beware, for performace reasons the ordinate index is not checked, if
* it's over dimensions you may not get an exception but a meaningless
* value.
*/
public double getOrdinate(int index, int ordinate) {
return coords[index * dimension + ordinate];
}
/**
* @see com.vividsolutions.jts.geom.PackedCoordinateSequence#setOrdinate(int,
* int, double)
*/
public void setOrdinate(int index, int ordinate, double value) {
coordRef = null;
coords[index * dimension + ordinate] = value;
}
public Envelope expandEnvelope(Envelope env)
{
for (int i = 0; i < coords.length; i += dimension ) {
env.expandToInclude(coords[i], coords[i + 1]);
}
return env;
}
}
/**
* Packed coordinate sequence implementation based on floats
*/
public static class Float extends PackedCoordinateSequence {
/**
* The packed coordinate array
*/
float[] coords;
/**
* Constructs a packed coordinate sequence from an array of <code>float<code>s
*
* @param coords
* @param dimensions
*/
public Float(float[] coords, int dimensions) {
if (dimensions < 2) {
throw new IllegalArgumentException("Must have at least 2 dimensions");
}
if (coords.length % dimensions != 0) {
throw new IllegalArgumentException("Packed array does not contain "
+ "an integral number of coordinates");
}
this.dimension = dimensions;
this.coords = coords;
}
/**
* Constructs a packed coordinate sequence from an array of <code>double<code>s
*
* @param coordinates
* @param dimension
*/
public Float(double[] coordinates, int dimensions) {
this.coords = new float[coordinates.length];
this.dimension = dimensions;
for (int i = 0; i < coordinates.length; i++) {
this.coords[i] = (float) coordinates[i];
}
}
/**
* Constructs a packed coordinate sequence out of a coordinate array
*
* @param coordinates
*/
public Float(Coordinate[] coordinates, int dimension) {
if (coordinates == null)
coordinates = new Coordinate[0];
this.dimension = dimension;
coords = new float[coordinates.length * this.dimension];
for (int i = 0; i < coordinates.length; i++) {
coords[i * this.dimension] = (float) coordinates[i].x;
if (this.dimension >= 2)
coords[i * this.dimension + 1] = (float) coordinates[i].y;
if (this.dimension >= 3)
coords[i * this.dimension + 2] = (float) coordinates[i].z;
}
}
/**
* Constructs an empty packed coordinate sequence of a given size and dimension
*
* @param coordinates
*/
public Float(int size, int dimension) {
this.dimension = dimension;
coords = new float[size * this.dimension];
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getCoordinate(int)
*/
public Coordinate getCoordinateInternal(int i) {
double x = coords[i * dimension];
double y = coords[i * dimension + 1];
double z = dimension == 2 ? Coordinate.NULL_ORDINATE : coords[i * dimension + 2];
return new Coordinate(x, y, z);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#size()
*/
public int size() {
return coords.length / dimension;
}
/**
* @see java.lang.Object#clone()
*/
public Object clone() {
float[] clone = new float[coords.length];
System.arraycopy(coords, 0, clone, 0, coords.length);
return new Float(clone, dimension);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getOrdinate(int, int)
* Beware, for performace reasons the ordinate index is not checked, if
* it's over dimensions you may not get an exception but a meaningless
* value.
*/
public double getOrdinate(int index, int ordinate) {
return coords[index * dimension + ordinate];
}
/**
* @see com.vividsolutions.jts.geom.PackedCoordinateSequence#setOrdinate(int,
* int, double)
*/
public void setOrdinate(int index, int ordinate, double value) {
coordRef = null;
coords[index * dimension + ordinate] = (float) value;
}
public Envelope expandEnvelope(Envelope env)
{
for (int i = 0; i < coords.length; i += dimension ) {
env.expandToInclude(coords[i], coords[i + 1]);
}
return env;
}
}
}