/*
* 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.revolsys.geometry.model.impl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import com.revolsys.geometry.model.BoundingBox;
import com.revolsys.geometry.model.Geometry;
import com.revolsys.geometry.model.GeometryCollection;
import com.revolsys.geometry.model.GeometryFactory;
import com.revolsys.util.Exceptions;
/**
* Models a collection of {@link Geometry}s of
* arbitrary type and dimension.
*
*
*@version 1.7
*/
public class GeometryCollectionImpl implements GeometryCollection {
private static final long serialVersionUID = -5694727726395021467L;
/**
* The bounding box of this <code>Geometry</code>.
*/
private BoundingBox boundingBox;
/**
* Internal representation of this <code>GeometryCollection</code>.
*/
private Geometry[] geometries;
/**
* The {@link GeometryFactory} used to create this Geometry
*/
private final GeometryFactory geometryFactory;
public GeometryCollectionImpl(final GeometryFactory geometryFactory) {
this.geometryFactory = geometryFactory;
}
/**
* @param geometries
* the <code>Geometry</code>s for this <code>GeometryCollection</code>,
* or <code>null</code> or an empty array to create the empty
* geometry. Elements may be empty <code>Geometry</code>s,
* but not <code>null</code>s.
*/
public GeometryCollectionImpl(final GeometryFactory geometryFactory,
final Geometry[] geometries) {
this.geometryFactory = geometryFactory;
if (geometries == null || geometries.length == 0) {
this.geometries = null;
} else if (Geometry.hasNullElements(geometries)) {
throw new IllegalArgumentException("geometries must not contain null elements");
} else {
this.geometries = geometries;
}
}
/**
* Creates and returns a full copy of this object.
* (including all coordinates contained by it).
*
* @return a clone of this instance
*/
@Override
public GeometryCollectionImpl clone() {
try {
final GeometryCollectionImpl geometryCollection = (GeometryCollectionImpl)super.clone();
geometryCollection.geometries = new Geometry[this.geometries.length];
for (int i = 0; i < this.geometries.length; i++) {
geometryCollection.geometries[i] = this.geometries[i].clone();
}
return geometryCollection;
} catch (final CloneNotSupportedException e) {
throw Exceptions.wrap(e);
}
}
/**
* Tests whether this geometry is structurally and numerically equal
* to a given <code>Object</code>.
* If the argument <code>Object</code> is not a <code>Geometry</code>,
* the result is <code>false</code>.
* Otherwise, the result is computed using
* {@link #equals(2,Geometry)}.
* <p>
* This method is provided to fulfill the Java contract
* for value-based object equality.
* In conjunction with {@link #hashCode()}
* it provides semantics which are most useful
* for using
* <code>Geometry</code>s as keys and values in Java collections.
* <p>
* Note that to produce the expected result the input geometries
* should be in normal form. It is the caller's
* responsibility to perform this where required
* (using {@link Geometry#norm()
* or {@link #normalize()} as appropriate).
*
* @param other the Object to compare
* @return true if this geometry is exactly equal to the argument
*
* @see #equals(2,Geometry)
* @see #hashCode()
* @see #norm()
* @see #normalize()
*/
@Override
public boolean equals(final Object other) {
if (other instanceof Geometry) {
final Geometry geometry = (Geometry)other;
return equals(2, geometry);
} else {
return false;
}
}
@Override
public int getAxisCount() {
return this.geometryFactory.getAxisCount();
}
@Override
public BoundingBox getBoundingBox() {
if (this.boundingBox == null) {
this.boundingBox = newBoundingBox();
}
return this.boundingBox;
}
@SuppressWarnings("unchecked")
@Override
public <V extends Geometry> List<V> getGeometries() {
if (this.geometries == null) {
return new ArrayList<>();
} else {
return (List<V>)new ArrayList<>(Arrays.asList(this.geometries));
}
}
@SuppressWarnings("unchecked")
@Override
public <V extends Geometry> V getGeometry(final int n) {
if (this.geometries == null) {
return null;
} else {
return (V)this.geometries[n];
}
}
@Override
public int getGeometryCount() {
if (this.geometries == null) {
return 0;
} else {
return this.geometries.length;
}
}
@Override
public GeometryFactory getGeometryFactory() {
return this.geometryFactory;
}
@Override
public int getSegmentCount() {
int segmentCount = 0;
for (final Geometry geometry : geometries()) {
segmentCount += geometry.getSegmentCount();
}
return segmentCount;
}
/**
* Gets a hash code for the Geometry.
*
* @return an integer value suitable for use as a hashcode
*/
@Override
public int hashCode() {
return getBoundingBox().hashCode();
}
@Override
public boolean isEmpty() {
return this.geometries == null;
}
@Override
public boolean isHomogeneousGeometryCollection() {
return false;
}
@Override
public Geometry prepare() {
return this;
}
@Override
public String toString() {
return toEwkt();
}
}