001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2007-2010 ADEQUATE SYSTEMS SARL
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.generator;
022
023 import java.io.IOException;
024 import java.util.ArrayList;
025 import java.util.Collection;
026
027 import org.granite.generator.exception.GenerationException;
028 import org.granite.generator.exception.TransformerNotFoundException;
029
030 /**
031 * @author Franck WOLFF
032 */
033 public class Generator extends ArrayList<Transformer<?, ?, ?>> {
034
035 ///////////////////////////////////////////////////////////////////////////
036 // Fields.
037
038 private static final long serialVersionUID = 1L;
039
040 public static final String VERSION = "2.2.0";
041
042 private Configuration config = null;
043
044 ///////////////////////////////////////////////////////////////////////////
045 // Constructors.
046
047 public Generator() {
048 }
049
050 public Generator(Configuration config) {
051 this.config = config;
052 }
053
054 ///////////////////////////////////////////////////////////////////////////
055 // Getters/Setters.
056
057 public Configuration getConfig() {
058 return config;
059 }
060
061 public void setConfig(Configuration config) {
062 this.config = config;
063 }
064
065 ///////////////////////////////////////////////////////////////////////////
066 // Generation method.
067
068 public Output<?>[] generate(Input<?> input) throws IOException, GenerationException {
069 updateTransformers();
070
071 Transformer<?, ?, ?> transformer = null;
072
073 for (Transformer<?, ?, ?> t : this) {
074 if (t.accept(input)) {
075 transformer = t;
076 break;
077 }
078 }
079
080 if (transformer == null)
081 throw new TransformerNotFoundException(input);
082
083 return transformer.generate(input);
084 }
085
086 ///////////////////////////////////////////////////////////////////////////
087 // Utilities.
088
089 protected void updateTransformers() {
090 for (Transformer<?, ?, ?> transformer : this)
091 transformer.setConfig(config);
092 }
093
094 protected boolean checkAdd(Transformer<?, ?, ?> transformer) {
095 if (transformer == null)
096 throw new NullPointerException("A transformer cannot be null");
097 return !contains(transformer);
098 }
099
100 ///////////////////////////////////////////////////////////////////////////
101 // ArrayList overridden methods (check for null & duplicates).
102
103 @Override
104 public void add(int index, Transformer<?, ?, ?> transformer) {
105 if (checkAdd(transformer))
106 super.add(index, transformer);
107 }
108
109 @Override
110 public boolean add(Transformer<?, ?, ?> transformer) {
111 if (checkAdd(transformer))
112 return super.add(transformer);
113 return false;
114 }
115
116 @Override
117 public boolean addAll(Collection<? extends Transformer<?, ?, ?>> transformers) {
118 boolean changed = false;
119 for (Transformer<?, ?, ?> transformer : transformers) {
120 if (checkAdd(transformer)) {
121 super.add(transformer);
122 changed = true;
123 }
124 }
125 return changed;
126 }
127
128 @Override
129 public boolean addAll(int index, Collection<? extends Transformer<?, ?, ?>> transformers) {
130 boolean changed = false;
131 for (Transformer<?, ?, ?> transformer : transformers) {
132 if (checkAdd(transformer)) {
133 super.add(index++, transformer);
134 changed = true;
135 }
136 }
137 return changed;
138 }
139
140 @Override
141 public Transformer<?, ?, ?> set(int index, Transformer<?, ?, ?> transformer) {
142 if (checkAdd(transformer))
143 return super.set(index, transformer);
144 return null;
145 }
146 }