001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022
023package org.granite.generator;
024
025import java.io.IOException;
026
027import org.granite.generator.exception.GenerationException;
028
029/**
030 * @author Franck WOLFF
031 */
032public abstract class Transformer<I extends Input<?>, O extends Output<?>, C extends Configuration> {
033
034        private C config = null;
035        private Listener listener = null;
036        
037        public Transformer() {
038        }
039        
040        public Transformer(Configuration config, Listener listener) {
041                setConfig(config);
042                this.listener = listener;
043        }
044        
045        public C getConfig() {
046                return config;
047        }
048
049        @SuppressWarnings("unchecked")
050        public void setConfig(Configuration config) {
051                this.config = (C)config;
052        }
053        
054        public Listener getListener() {
055                return listener;
056        }
057
058        public void setListener(Listener listener) {
059                this.listener = listener;
060        }
061        
062        protected abstract boolean accept(Input<?> input);
063        
064        protected abstract O[] getOutputs(I input) throws IOException, GenerationException;
065
066        @SuppressWarnings("unchecked")
067        public Output<?>[] generate(Input<?> input) throws IOException, GenerationException {
068                O[] outputs = getOutputs((I)input);
069                
070                for (O output : outputs) {
071                        if (output.isOutdated()) {
072                                listener.generating(input, output);
073                                generate((I)input, output);
074                        }
075                        else
076                                listener.skipping(input, output);
077                }
078                
079                return outputs;
080        }
081        
082        protected abstract void generate(I input, O output) throws IOException, GenerationException;
083        
084        @Override
085        public boolean equals(Object obj) {
086                return obj != null && obj.getClass().equals(getClass());
087        }
088
089        @Override
090        public int hashCode() {
091                return getClass().hashCode();
092        }
093
094        @Override
095        public String toString() {
096                return getClass().getName();
097        }
098}