svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.geometry / org.gvsig.expressionevaluator.geometry.lib / org.gvsig.expressionevaluator.geometry.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / spatial / STPointNFunction.java @ 44644
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1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.spatial; |
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2 | |||
3 | import org.apache.commons.lang3.Range; |
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4 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
5 | 44644 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractGeometryFunction; |
6 | 43518 | jjdelcerro | import org.gvsig.fmap.geom.Geometry; |
7 | import org.gvsig.fmap.geom.primitive.OrientablePrimitive; |
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8 | import org.gvsig.fmap.geom.primitive.Point; |
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9 | 43512 | jjdelcerro | |
10 | 44644 | jjdelcerro | public class STPointNFunction extends AbstractGeometryFunction { |
11 | 43512 | jjdelcerro | |
12 | 43518 | jjdelcerro | public STPointNFunction() {
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13 | super("OGC", "ST_PointN", Range.is(2)); |
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14 | 43512 | jjdelcerro | } |
15 | |||
16 | @Override
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17 | 44009 | jjdelcerro | public boolean allowConstantFolding() { |
18 | return true; |
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19 | } |
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20 | |||
21 | @Override
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22 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
23 | 43518 | jjdelcerro | Geometry geom = getGeom(args, 0);
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24 | if ( geom instanceof OrientablePrimitive ) { |
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25 | Point n = ((OrientablePrimitive) geom).getVertex(getInt(args, 1)); |
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26 | return n;
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27 | } |
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28 | return null; |
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29 | 43512 | jjdelcerro | } |
30 | |||
31 | } |