001 /**
002 * Copyright (c) 2010, SIB. All rights reserved.
003 *
004 * SIB (Swiss Institute of Bioinformatics) - http://www.isb-sib.ch Host -
005 * https://sourceforge.net/projects/javaprotlib/
006 *
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions are met:
009 * Redistributions of source code must retain the above copyright notice, this
010 * list of conditions and the following disclaimer. Redistributions in binary
011 * form must reproduce the above copyright notice, this list of conditions and
012 * the following disclaimer in the documentation and/or other materials provided
013 * with the distribution. Neither the name of the SIB/GENEBIO nor the names of
014 * its contributors may be used to endorse or promote products derived from this
015 * software without specific prior written permission.
016 *
017 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
018 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020 * ARE DISCLAIMED. IN NO EVENT SHALL SIB/GENEBIO BE LIABLE FOR ANY DIRECT,
021 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
022 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
023 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
024 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
026 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027 */
028 package org.expasy.jpl.commons.base.process;
029
030
031 import java.util.ArrayList;
032 import java.util.List;
033 import org.apache.commons.collections15.Transformer;
034
035
036 /**
037 * A sequence of {@code Transformer}s.
038 *
039 * @author nikitin
040 *
041 * @param <U> the object type to transform.
042 * @param <V> the object type transformed.
043 *
044 * @version 1.0
045 *
046 */
047 @SuppressWarnings("unchecked")
048 public final class U2VSequenceTransformer<U, V> implements Transformer<U, V> {
049
050 private Object obj;
051 private List<Transformer> transformers;
052
053 private U2VSequenceTransformer() {
054 transformers = new ArrayList<Transformer>();
055 }
056
057 public static <U, V> U2VSequenceTransformer newInstance() {
058 return new U2VSequenceTransformer<U, V>();
059 }
060
061 // TODO: how to control the following correct sequence
062 // : the previous return map type T has to be the same as the current param
063 // one
064 // : U -> U1 -> U2 -> ... -> Un-1 -> Un -> V
065 public <U1, U2> void addTransformer(final Transformer<U1, U2> transformer) {
066 transformers.add(transformer);
067 }
068
069 public V transform(final U object) {
070 execute(object);
071 return (V) obj;
072 }
073
074 private void execute(U object) {
075
076 obj = object;
077
078 // U -> U1 -> U2 -> ... -> Un-1 -> Un -> V
079 for (final Transformer mapper : transformers) {
080 obj = mapper.transform(obj);
081 }
082 }
083
084 // public String toString() {
085 // StringBuilder sb = new StringBuilder();
086 //
087 // sb.append("[");
088 //
089 // if (mappers.size() > 0) {
090 // for (final JPLIMapper mapper : mappers) {
091 // sb.append(mapper);
092 // sb.append(", ");
093 // }
094 // sb.delete(sb.length() - 2, sb.length());
095 // }
096 //
097 // sb.append("]");
098 //
099 // return sb.toString();
100 // }
101
102 }