root / trunk / libraries / libTopology / src / com / vividsolutions / jcs / conflate / polygonmatch / ThresholdFilter.java @ 22873
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1 | 22873 | azabala | |
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2 | |||
3 | /*
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4 | * The JCS Conflation Suite (JCS) is a library of Java classes that
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5 | * can be used to build automated or semi-automated conflation solutions.
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6 | *
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7 | * Copyright (C) 2003 Vivid Solutions
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8 | *
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9 | * This program is free software; you can redistribute it and/or
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10 | * modify it under the terms of the GNU General Public License
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11 | * as published by the Free Software Foundation; either version 2
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12 | * of the License, or (at your option) any later version.
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13 | *
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14 | * This program is distributed in the hope that it will be useful,
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 | * GNU General Public License for more details.
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18 | *
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19 | * You should have received a copy of the GNU General Public License
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20 | * along with this program; if not, write to the Free Software
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21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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22 | *
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23 | * For more information, contact:
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24 | *
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25 | * Vivid Solutions
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26 | * Suite #1A
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27 | * 2328 Government Street
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28 | * Victoria BC V8T 5G5
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29 | * Canada
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30 | *
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31 | * (250)385-6040
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32 | * www.vividsolutions.com
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33 | */
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34 | |||
35 | package com.vividsolutions.jcs.conflate.polygonmatch; |
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36 | |||
37 | import com.vividsolutions.jump.feature.Feature; |
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38 | import com.vividsolutions.jump.feature.FeatureCollection; |
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39 | |||
40 | /**
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41 | * Filters out shapes with a score below a given value.
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42 | */
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43 | public class ThresholdFilter implements FeatureMatcher { |
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44 | |||
45 | /**
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46 | * Creates a ThresholdFilter with the given minimum score.
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47 | * @param minScore the score below which shapes will be filtered out
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48 | */
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49 | public ThresholdFilter(double minScore) { |
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50 | this.minScore = minScore;
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51 | } |
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52 | |||
53 | private double minScore; |
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54 | |||
55 | /**
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56 | * Filters out shapes with a score below the minimum score threshold.
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57 | * @param target ignored
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58 | * @param candidates a Matches object created by another FeatureMatcher
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59 | * @return the candidates having a score greater than or equal to the
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60 | * threshold score. The scores are preserved from the original Matches
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61 | * object.
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62 | */
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63 | public Matches match(Feature target, FeatureCollection candidates) {
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64 | Matches survivors = new Matches(candidates.getFeatureSchema());
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65 | Matches allMatches = (Matches) candidates; |
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66 | for (int i = 0; i < allMatches.size(); i++) { |
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67 | if (allMatches.getScore(i) >= minScore) {
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68 | survivors.add(allMatches.getFeature(i), allMatches.getScore(i)); |
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69 | } |
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70 | } |
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71 | return survivors;
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72 | } |
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73 | } |