01: /*
02: * GeoTools - OpenSource mapping toolkit
03: * http://geotools.org
04: * (C) 2005-2006, GeoTools Project Managment Committee (PMC)
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation;
09: * version 2.1 of the License.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: */
16: package org.geotools.feature.visitor;
17:
18: /**
19: * A visitor which performs a calculation on a FeatureCollection. A FeatureCalc
20: * will not modify the features visited.
21: *
22: * @author Cory Horner, Refractions
23: *
24: * @see FeatureVisitor
25: * @since 2.2.M2
26: * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/main/src/main/java/org/geotools/feature/visitor/FeatureCalc.java $
27: */
28: public interface FeatureCalc extends FeatureVisitor {
29: /**
30: * Returns the result of the calculation as a handy object which can be merged and modified.
31: *
32: * @return the results of the calculation
33: */
34: CalcResult getResult();
35: }
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