org.locationtech.jts.geom.prep.PreparedPolygonCovers Maven / Gradle / Ivy
/*
* Copyright (c) 2016 Vivid Solutions.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.geom.prep;
import org.locationtech.jts.geom.Geometry;
/**
* Computes the covers spatial relationship predicate
* for a {@link PreparedPolygon} relative to all other {@link Geometry} classes.
* Uses short-circuit tests and indexing to improve performance.
*
* It is not possible to short-circuit in all cases, in particular
* in the case where the test geometry touches the polygon linework.
* In this case full topology must be computed.
*
* @author Martin Davis
*
*/
class PreparedPolygonCovers
extends AbstractPreparedPolygonContains
{
/**
* Computes the covers predicate between a {@link PreparedPolygon}
* and a {@link Geometry}.
*
* @param prep the prepared polygon
* @param geom a test geometry
* @return true if the polygon covers the geometry
*/
public static boolean covers(PreparedPolygon prep, Geometry geom)
{
PreparedPolygonCovers polyInt = new PreparedPolygonCovers(prep);
return polyInt.covers(geom);
}
/**
* Creates an instance of this operation.
*
* @param prepPoly the PreparedPolygon to evaluate
*/
public PreparedPolygonCovers(PreparedPolygon prepPoly)
{
super(prepPoly);
requireSomePointInInterior = false;
}
/**
* Tests whether this PreparedPolygon covers a given geometry.
*
* @param geom the test geometry
* @return true if the test geometry is covered
*/
public boolean covers(Geometry geom)
{
return eval(geom);
}
/**
* Computes the full topological covers predicate.
* Used when short-circuit tests are not conclusive.
*
* @param geom the test geometry
* @return true if this prepared polygon covers the test geometry
*/
protected boolean fullTopologicalPredicate(Geometry geom)
{
boolean result = prepPoly.getGeometry().covers(geom);
return result;
}
}