Source Code Cross Referenced for MappedPosition.java in  » GIS » GeoTools-2.4.1 » org » geotools » referencing » operation » builder » 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.referencing.operation.builder 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    Geotools2 - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 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;
009:         *    version 2.1 of the License.
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.referencing.operation.builder;
017:
018:        // J2SE dependencies
019:        import java.io.Serializable;
020:
021:        // OpenGIS dependencies
022:        import org.opengis.referencing.operation.MathTransform;
023:        import org.opengis.referencing.operation.TransformException;
024:        import org.opengis.geometry.MismatchedDimensionException;
025:        import org.opengis.geometry.DirectPosition;
026:
027:        // Geotools dependencies
028:        import org.geotools.io.TableWriter;
029:        import org.geotools.geometry.DirectPosition2D;
030:        import org.geotools.geometry.GeneralDirectPosition;
031:        import org.geotools.resources.i18n.VocabularyKeys;
032:        import org.geotools.resources.i18n.Vocabulary;
033:        import org.geotools.resources.i18n.ErrorKeys;
034:        import org.geotools.resources.i18n.Errors;
035:        import org.geotools.resources.Utilities;
036:
037:        /**
038:         * An association between a {@linkplain #getSource source} and {@linkplain #getTarget target}
039:         * direct positions. Accuracy information and comments can optionnaly be attached.
040:         *
041:         * @since 2.4
042:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/referencing/src/main/java/org/geotools/referencing/operation/builder/MappedPosition.java $
043:         * @version $Id: MappedPosition.java 25262 2007-04-23 21:11:16Z desruisseaux $
044:         * @author Jan Jezek
045:         * @author Martin Desruisseaux
046:         */
047:        public class MappedPosition implements  Serializable {
048:            /**
049:             * For cross-version compatibility.
050:             */
051:            private static final long serialVersionUID = 3262172371858749543L;
052:
053:            /**
054:             * The source position.
055:             */
056:            private final DirectPosition source;
057:
058:            /**
059:             * The target position.
060:             */
061:            private final DirectPosition target;
062:
063:            /**
064:             * An estimation of mapping accuracy in units of target CRS axis,
065:             * or {@link Double#NaN} if unknow.
066:             */
067:            private double accuracy = Double.NaN;
068:
069:            /**
070:             * Optionnal comments attached to this mapping, or {@code null} if none.
071:             */
072:            private String comments;
073:
074:            /**
075:             * Creates a mapped position with {@linkplain #getSource source} and
076:             * {@linkplain #getTarget target} position of the specified dimension.
077:             * The initial coordinate values are 0.
078:             */
079:            public MappedPosition(final int dimension) {
080:                if (dimension == 2) {
081:                    source = new DirectPosition2D();
082:                    target = new DirectPosition2D();
083:                } else {
084:                    source = new GeneralDirectPosition(dimension);
085:                    target = new GeneralDirectPosition(dimension);
086:                }
087:            }
088:
089:            /**
090:             * Creates a mapped position from the specified direct positions.
091:             *
092:             * @param source The original direct position.
093:             * @param target The associated direct position.
094:             */
095:            public MappedPosition(final DirectPosition source,
096:                    final DirectPosition target) {
097:                ensureNonNull("source", source);
098:                ensureNonNull("target", target);
099:                this .source = source;
100:                this .target = target;
101:            }
102:
103:            /**
104:             * Makes sure an argument is non-null.
105:             *
106:             * @param  name   Argument name.
107:             * @param  object User argument.
108:             * @throws InvalidParameterValueException if {@code object} is null.
109:             */
110:            private static void ensureNonNull(final String name,
111:                    final Object object) throws IllegalArgumentException {
112:                if (object == null) {
113:                    throw new IllegalArgumentException(Errors.format(
114:                            ErrorKeys.NULL_ARGUMENT_$1, name));
115:                }
116:            }
117:
118:            /**
119:             * Returns the source direct position. For performance reasons, the current
120:             * implementation returns a reference to the internal object. However users
121:             * should avoid to modify directly the returned position and use
122:             * {@link #setSource} instead.
123:             */
124:            public DirectPosition getSource() {
125:                return source;
126:            }
127:
128:            /**
129:             * Set the source direct position to the specified value.
130:             */
131:            public void setSource(final DirectPosition point) {
132:                if (source instanceof  DirectPosition2D) {
133:                    ((DirectPosition2D) source).setLocation(point);
134:                } else {
135:                    ((GeneralDirectPosition) source).setLocation(point);
136:                }
137:            }
138:
139:            /**
140:             * Returns the target direct position. For performance reasons, the current
141:             * implementation returns a reference to the internal object. However users
142:             * should avoid to modify directly the returned position and use
143:             * {@link #setTarget} instead.
144:             */
145:            public DirectPosition getTarget() {
146:                return target;
147:            }
148:
149:            /**
150:             * Set the target direct position to the specified value.
151:             */
152:            public void setTarget(final DirectPosition point) {
153:                if (source instanceof  DirectPosition2D) {
154:                    ((DirectPosition2D) target).setLocation(point);
155:                } else {
156:                    ((GeneralDirectPosition) target).setLocation(point);
157:                }
158:            }
159:
160:            /**
161:             * Returns the comments attached to this mapping, or {@code null} if none.
162:             */
163:            public String getComments() {
164:                return comments;
165:            }
166:
167:            /**
168:             * Set the comments attached to this mapping. May be {@code null} if none.
169:             */
170:            public void setComments(final String comments) {
171:                this .comments = comments;
172:            }
173:
174:            /**
175:             * Returns an estimation of mapping accuracy in units of target CRS axis,
176:             * or {@link Double#NaN} if unknow.
177:             */
178:            public double getAccuracy() {
179:                return accuracy;
180:            }
181:
182:            /**
183:             * Set the accuracy.
184:             */
185:            public void setAccuracy(final double accuracy) {
186:                this .accuracy = accuracy;
187:            }
188:
189:            /**
190:             * Computes the distance between the {@linkplain #getSource source point} transformed
191:             * by the supplied math transform, and the {@linkplain #getTarget target point}.
192:             *
193:             * @param  transform The transform to use for computing the error.
194:             * @param  buffer An optionnaly pre-computed direct position to use as a buffer,
195:             *         or {@code null} if none. The content of this buffer will be overwritten.
196:             * @return The distance in units of the target CRS axis.
197:             */
198:            final double getError(final MathTransform transform,
199:                    final DirectPosition buffer) throws TransformException {
200:                return distance(transform.transform(source, buffer), target);
201:            }
202:
203:            /**
204:             * Returns the distance between the specified points.
205:             */
206:            private static double distance(final DirectPosition source,
207:                    final DirectPosition target) {
208:                final int otherDim = source.getDimension();
209:                final int dimension = target.getDimension();
210:                if (otherDim != dimension) {
211:                    throw new MismatchedDimensionException(Errors.format(
212:                            ErrorKeys.MISMATCHED_DIMENSION_$2, new Integer(
213:                                    otherDim), new Integer(dimension)));
214:                }
215:                double sum = 0;
216:                for (int i = 0; i < dimension; i++) {
217:                    final double delta = source.getOrdinate(i)
218:                            - target.getOrdinate(i);
219:                    sum += delta * delta;
220:                }
221:                return Math.sqrt(sum / dimension);
222:            }
223:
224:            /**
225:             * Returns a hash code value for this mapped position.
226:             */
227:            public int hashCode() {
228:                return source.hashCode() + 37 * target.hashCode();
229:            }
230:
231:            /**
232:             * Compares this mapped position with the specified object for equality.
233:             */
234:            public boolean equals(final Object object) {
235:                if (object != null && object.getClass().equals(getClass())) {
236:                    final MappedPosition that = (MappedPosition) object;
237:                    return Utilities.equals(this .source, that.source)
238:                            && Utilities.equals(this .target, that.target)
239:                            && Utilities.equals(this .comments, that.comments)
240:                            && Double.doubleToLongBits(this .accuracy) == Double
241:                                    .doubleToLongBits(that.accuracy);
242:                }
243:                return false;
244:            }
245:
246:            /**
247:             * Returns a string representation of this mapped position.
248:             *
249:             * @todo Consider using a {@link java.text.NumberFormat} instance.
250:             */
251:            public String toString() {
252:                final TableWriter table = new TableWriter(null, " ");
253:                table.write(Vocabulary.format(VocabularyKeys.SOURCE_POINT));
254:                table.write(':');
255:                int dimension = source.getDimension();
256:                for (int i = 0; i < dimension; i++) {
257:                    table.nextColumn();
258:                    table.write(String.valueOf(source.getOrdinate(i)));
259:                }
260:                table.nextLine();
261:                table.write(Vocabulary.format(VocabularyKeys.TARGET_POINT));
262:                table.write(':');
263:                dimension = target.getDimension();
264:                for (int i = 0; i < dimension; i++) {
265:                    table.nextColumn();
266:                    table.write(String.valueOf(target.getOrdinate(i)));
267:                }
268:                return table.toString();
269:            }
270:        }
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