Source Code Cross Referenced for LineMustBeASinglePartValidation.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.LineString;
027:
028:        /**
029:         * LineIsSingleSegmentFeatureValidation purpose.
030:         * 
031:         * <p>
032:         * Tests to see if a LineString is made of only one segment, meaning it only
033:         * has two points. If the LineString has more than two points, the test fails.
034:         * </p>
035:         * 
036:         * <p>
037:         * This method has been extended to work with MultiLineStrings - this is
038:         * the most common format that shapefile appears in and as such is forcing
039:         * our hand.
040:         * </p>
041:         * 
042:         * <p>
043:         * Example Use:
044:         * <pre><code>
045:         * LineIsSingleSegmentFeatureValidation x = new LineIsSingleSegmentFeatureValidation("noSelfIntersectRoads", "Tests to see if a 
046:         * geometry intersects itself", new String[] {"road"});
047:         * </code></pre>
048:         * </p>
049:         *
050:         * @author bowens, Refractions Research, Inc.
051:         * @author $Author: jive $ (last modification)
052:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/extension/validation/src/main/java/org/geotools/validation/spatial/LineMustBeASinglePartValidation.java $
053:         * @version $Id: LineMustBeASinglePartValidation.java 27862 2007-11-12 19:51:19Z desruisseaux $
054:         */
055:        public class LineMustBeASinglePartValidation extends
056:                DefaultFeatureValidation {
057:            /** The logger for the validation module. */
058:            private static final Logger LOGGER = org.geotools.util.logging.Logging
059:                    .getLogger("org.geotools.validation");
060:
061:            /**
062:             * LineIsSingleSegmentFeatureValidation constructor.
063:             * 
064:             * <p>
065:             * Description
066:             * </p>
067:             */
068:            public LineMustBeASinglePartValidation() {
069:            }
070:
071:            /**
072:             * Override getPriority.
073:             * 
074:             * <p>
075:             * Sets the priority level of this validation.
076:             * </p>
077:             *
078:             * @return <code>PRIORITY_SIMPLE</code>
079:             *
080:             * @see org.geotools.validation.Validation#getPriority()
081:             */
082:            public int getPriority() {
083:                return PRIORITY_SIMPLE;
084:            }
085:
086:            /**
087:             * Override validate.
088:             * 
089:             * <p>
090:             * Tests to see if a LineString is made of only one segment, meaning it
091:             * only has two points. If the LineString has more than two points, the
092:             * test fails.
093:             * </p>
094:             *
095:             * @param feature The Feature to be validated
096:             * @param type The FeatureTypeInfo of the feature
097:             * @param results The storage for error messages.
098:             *
099:             * @return True if the feature is simple (one segment).
100:             *
101:             * @see org.geotools.validation.FeatureValidation#validate(org.geotools.feature.Feature,
102:             *      org.geotools.feature.FeatureTypeInfo,
103:             *      org.geotools.validation.ValidationResults)
104:             */
105:            public boolean validate(Feature feature, FeatureType type,
106:                    ValidationResults results) {
107:                LOGGER.setLevel(Level.ALL);
108:
109:                LineString line = null;
110:                try {
111:                    line = getDefaultLineString(feature);
112:                } catch (ClassCastException wrongType) {
113:                    results.warning(feature, wrongType.getMessage());
114:                    return true;
115:                }
116:                if (line == null) {
117:                    // Geometry was null - user can check with nullZero
118:                    return true;
119:                }
120:                final int NUMBER_OF_POINTS = line.getNumPoints();
121:                if (NUMBER_OF_POINTS < 2) {
122:                    results
123:                            .error(feature,
124:                                    "LineString contains too few points");
125:                    return false;
126:                } else if (NUMBER_OF_POINTS > 2) {
127:                    // log the error and return
128:                    String message = "LineString is not single part (contains "
129:                            + (NUMBER_OF_POINTS - 1) + " segments)";
130:                    results.error(feature, message);
131:                    LOGGER.log(Level.FINEST, getName() + "(" + feature.getID()
132:                            + "):" + message);
133:
134:                    return false;
135:                }
136:                LOGGER.log(Level.FINEST, getName() + "(" + feature.getID()
137:                        + ") passed");
138:                return true;
139:            }
140:        }
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