Source Code Cross Referenced for LineNoSelfIntersectValidation.java in  » GIS » GeoTools-2.4.1 » org » geotools » validation » spatial » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.validation.spatial 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2004-2006, Geotools Project Managment Committee (PMC)
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation; either
009:         *    version 2.1 of the License, or (at your option) any later version.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.validation.spatial;
017:
018:        import java.util.logging.Level;
019:        import java.util.logging.Logger;
020:
021:        import org.geotools.feature.Feature;
022:        import org.geotools.feature.FeatureType;
023:        import org.geotools.validation.DefaultFeatureValidation;
024:        import org.geotools.validation.ValidationResults;
025:
026:        import com.vividsolutions.jts.geom.Coordinate;
027:        import com.vividsolutions.jts.geom.GeometryFactory;
028:        import com.vividsolutions.jts.geom.LineString;
029:
030:        /**
031:         * LineNoSelfIntersectFeatureValidation purpose.
032:         * 
033:         * <p>
034:         * Tests to see if a geometry crosses itself. It does not detect if a
035:         * segment of a LineString doubles back on itself for one segment, then
036:         * terminates. A different validation is needed to test overlapping. Uses JTS'
037:         * crosses routine.
038:         * </p>
039:         * 
040:         * <p>
041:         * Example Use:
042:         * <pre><code>
043:         * LineNoSelfIntersectFeatureValidation x = new LineNoSelfIntersectFeatureValidation("noSelfIntersectRoads", "Tests to see if a 
044:         * geometry intersects itself", new String[] {"road"});
045:         * </code></pre>
046:         * </p>
047:         *
048:         * @author bowens, Refractions Research, Inc.
049:         * @author $Author: jive $ (last modification)
050:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/extension/validation/src/main/java/org/geotools/validation/spatial/LineNoSelfIntersectValidation.java $
051:         * @version $Id: LineNoSelfIntersectValidation.java 27862 2007-11-12 19:51:19Z desruisseaux $
052:         * - bowens: changed intersects to crosses
053:         */
054:        public class LineNoSelfIntersectValidation extends
055:                DefaultFeatureValidation {
056:            /** The logger for the validation module. */
057:            private static final Logger LOGGER = org.geotools.util.logging.Logging
058:                    .getLogger("org.geotools.validation");
059:
060:            /**
061:             * LineNoSelfIntersectFeatureValidation constructor.
062:             * 
063:             * <p>
064:             * Description
065:             * </p>
066:             */
067:            public LineNoSelfIntersectValidation() {
068:            }
069:
070:            /**
071:             * Override getPriority.
072:             * 
073:             * <p>
074:             * Sets the priority level of this validation. This is set by the
075:             * programmer and is a measure of the expense of this plugin
076:             * </p>
077:             *
078:             * @return A made up priority for this validation.
079:             *
080:             * @see org.geotools.validation.Validation#getPriority()
081:             */
082:            public int getPriority() {
083:                return PRIORITY_COMPLEX;
084:            }
085:
086:            /**
087:             * Override validate.
088:             * 
089:             * <p>
090:             * Tests to see if a geometry intersects itself. It does not detect if a
091:             * segment of a LineString doubles back on itself for one segment, then
092:             * terminates. A different validation is needed to test overlapping. Uses
093:             * JTS' intersect routine.
094:             * </p>
095:             *
096:             * @param feature The Feature to be validated.
097:             * @param type The FeatureTypeInfo of the feature.
098:             * @param results The storage for error messages.
099:             *
100:             * @return True if the feature does not self intersect.
101:             *
102:             * @see org.geotools.validation.FeatureValidation#validate(org.geotools.feature.Feature,
103:             *      org.geotools.feature.FeatureTypeInfo,
104:             *      org.geotools.validation.ValidationResults)
105:             */
106:            public boolean validate(Feature feature, FeatureType type,
107:                    ValidationResults results) {
108:                LOGGER.setLevel(Level.ALL);
109:
110:                LineString line = null;
111:                try {
112:                    line = getDefaultLineString(feature);
113:                } catch (ClassCastException unLine) {
114:                    results.error(feature,
115:                            "Geometry is required to be a LineString");
116:                    System.out
117:                            .println(feature.getID() + "  name: " + getName());
118:                    System.out.println(feature.getID() + "   ref: "
119:                            + getTypeRef());
120:                    System.out.println(feature.getID() + "   ref: "
121:                            + getTypeRefs());
122:                }
123:                if (line == null) {
124:                    // Ignore null geometry (user can check with nullZero )
125:                    return true;
126:                }
127:                if (line.getNumPoints() < 2) {
128:                    results.warning(feature,
129:                            "LineString contains too few points");
130:                    return false;
131:                }
132:                GeometryFactory gf = new GeometryFactory();
133:
134:                int numPoints = line.getNumPoints();
135:
136:                // break up the LineString into line segments
137:                LineString[] segments = new LineString[numPoints - 1];
138:
139:                for (int i = 0; i < (numPoints - 1); i++) {
140:                    Coordinate[] coords = new Coordinate[] {
141:                            line.getCoordinateN(i), line.getCoordinateN(i + 1) };
142:                    segments[i] = gf.createLineString(coords);
143:                }
144:
145:                // intersect all of the line segments with each other
146:                for (int i = 0; i < segments.length; i++) // for each line segment
147:                {
148:                    for (int j = 0; j < segments.length; j++) // intersect with every other line segment
149:                    {
150:                        if ((i != j) && ((i - 1) != j) && ((i + 1) != j)) // if they aren't the same segment
151:                        {
152:                            if (segments[i].crosses(segments[j])) // changed to crosses - bowens
153:                            {
154:                                // log the error and return
155:                                results.error(feature,
156:                                        "LineString crossed itself");
157:                                return false;
158:                            }
159:                        }
160:                    }
161:                }
162:                return true;
163:            }
164:        }
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