001 //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/crs/transformations/coordinate/ConcatenatedTransform.java $
002 /*----------------------------------------------------------------------------
003 This file is part of deegree, http://deegree.org/
004 Copyright (C) 2001-2009 by:
005 Department of Geography, University of Bonn
006 and
007 lat/lon GmbH
008
009 This library is free software; you can redistribute it and/or modify it under
010 the terms of the GNU Lesser General Public License as published by the Free
011 Software Foundation; either version 2.1 of the License, or (at your option)
012 any later version.
013 This library is distributed in the hope that it will be useful, but WITHOUT
014 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016 details.
017 You should have received a copy of the GNU Lesser General Public License
018 along with this library; if not, write to the Free Software Foundation, Inc.,
019 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020
021 Contact information:
022
023 lat/lon GmbH
024 Aennchenstr. 19, 53177 Bonn
025 Germany
026 http://lat-lon.de/
027
028 Department of Geography, University of Bonn
029 Prof. Dr. Klaus Greve
030 Postfach 1147, 53001 Bonn
031 Germany
032 http://www.geographie.uni-bonn.de/deegree/
033
034 e-mail: info@deegree.org
035 ----------------------------------------------------------------------------*/
036
037 package org.deegree.crs.transformations.coordinate;
038
039 import java.util.List;
040
041 import javax.vecmath.Point3d;
042
043 import org.deegree.crs.Identifiable;
044 import org.deegree.crs.exceptions.TransformationException;
045 import org.deegree.crs.transformations.Transformation;
046
047 /**
048 * The <code>ConcatenatedTransform</code> class allows the connection of two transformations.
049 * <p>
050 * Calling inverse on this transformation will invert the whole underlying transformation chain. For example, if A * (B
051 * *C)=D and D is this transformation calling D.inverse() will result in (C.inverse * B.inverse) * A.inverse.
052 * </p>
053 *
054 * @author <a href="mailto:bezema@lat-lon.de">Rutger Bezema</a>
055 *
056 * @author last edited by: $Author: mschneider $
057 *
058 * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
059 *
060 */
061
062 public class ConcatenatedTransform extends CRSTransformation {
063
064 private static final long serialVersionUID = 9033876225805810824L;
065
066 private boolean isIdentitiy = false;
067
068 private Transformation firstTransform;
069
070 private Transformation secondTransform;
071
072 /**
073 * Creates a transform by concatenating two existing transforms. A concatenated transform applies two transforms,
074 * one after the other. The dimension of the output space of the first transform must match the dimension of the
075 * input space in the second transform.
076 *
077 * @param first
078 * The first transformation to apply to given points.
079 * @param second
080 * The second transformation to apply to given points.
081 * @param id
082 * an identifiable instance containing information about this transformation
083 */
084 public ConcatenatedTransform( Transformation first, Transformation second, Identifiable id ) {
085 super( first.getSourceCRS(), second.getTargetCRS(), id );
086 if ( first.isIdentity() && second.isIdentity() ) {
087 isIdentitiy = true;
088 }
089 firstTransform = first;
090 secondTransform = second;
091 }
092
093 /**
094 * Creates a transform by concatenating two existing transforms. A concatenated transform applies two transforms,
095 * one after the other. The dimension of the output space of the first transform must match the dimension of the
096 * input space in the second transform.
097 *
098 * Creates an Identifiable using the {@link CRSTransformation#createFromTo(String, String)} method.
099 *
100 * @param first
101 * The first transformation to apply to given points.
102 * @param second
103 * The second transformation to apply to given points.
104 */
105 public ConcatenatedTransform( Transformation first, Transformation second ) {
106 this( first, second, new Identifiable( Transformation.createFromTo( first.getIdentifier(),
107 second.getIdentifier() ) ) );
108 }
109
110 @Override
111 public List<Point3d> doTransform( List<Point3d> srcPts )
112 throws TransformationException {
113 if ( !isIdentitiy ) {
114 List<Point3d> dest = firstTransform.doTransform( srcPts );
115 return secondTransform.doTransform( dest );
116 }
117 return srcPts;
118 }
119
120 @Override
121 public void inverse() {
122 super.inverse();
123 Transformation tmp = firstTransform;
124 firstTransform = secondTransform;
125 secondTransform = tmp;
126 firstTransform.inverse();
127 secondTransform.inverse();
128 }
129
130 @Override
131 public boolean isIdentity() {
132 return isIdentitiy;
133 }
134
135 /**
136 * @return the firstTransform, which is the second transformation if this transform is inverse.
137 */
138 public final Transformation getFirstTransform() {
139 return firstTransform;
140 }
141
142 /**
143 * @return the secondTransform, which is the first transformation if this transform is inverse.
144 */
145 public final Transformation getSecondTransform() {
146 return secondTransform;
147 }
148
149 @Override
150 public String getImplementationName() {
151 return "Concatenated-Transform";
152 }
153
154 }