001    /*
002     * hammurapi-rules @mesopotamia.version@
003     * Hammurapi rules engine. 
004     * Copyright (C) 2005  Hammurapi Group
005     *
006     * This program 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; either
009     * version 2 of the License, or (at your option) any later version.
010     *
011     * This program 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     * You should have received a copy of the GNU Lesser General Public
017     * License along with this library; if not, write to the Free Software
018     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019     *
020     * URL: http://http://www.hammurapi.biz
021     * e-Mail: support@hammurapi.biz
022     */
023    package biz.hammurapi.rules;
024    
025    import java.io.File;
026    import java.io.FileInputStream;
027    import java.io.FileNotFoundException;
028    import java.io.FileOutputStream;
029    import java.io.IOException;
030    import java.io.ObjectInputStream;
031    import java.io.ObjectOutputStream;
032    import java.util.Map;
033    
034    import biz.hammurapi.config.ConfigurationException;
035    
036    public class FileObjectStorage implements ObjectStorage {
037            private Map objects;
038    
039            public void put(String key, Object value) {
040                    objects.put(key, value);
041    
042            }
043    
044            public void start() throws ConfigurationException {
045                    if (file==null) {
046                            throw new ConfigurationException("Storage file name is not set");
047                    }
048                    
049                    if (file.exists()) {
050                            if (file.isFile()) {
051                                    try {
052                                            ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
053                                            objects=(Map) ois.readObject();
054                                            ois.close();                                            
055                                    } catch (ClassNotFoundException e) {
056                                            throw new ConfigurationException("Could not load objects from: "+file.getAbsolutePath()+", class not found "+e, e);                                             
057                                    } catch (FileNotFoundException e) {
058                                            throw new ConfigurationException("Storage file does not exist: "+file.getAbsolutePath(), e);
059                                    } catch (IOException e) {
060                                            throw new ConfigurationException("Could not load objects from: "+file.getAbsolutePath(), e);
061                                    }
062                            } else {
063                                    throw new ConfigurationException("Not a file: "+file.getAbsolutePath());
064                            }
065                    }
066            }
067    
068            public void stop() throws ConfigurationException {
069                    try {
070                            ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(file));
071                            oos.writeObject(objects);
072                            oos.close();
073                    } catch (FileNotFoundException e) {
074                            throw new ConfigurationException("Collections file does not exist: "+file.getAbsolutePath(), e);
075                    } catch (IOException e) {
076                            throw new ConfigurationException("Could not load collections from: "+file.getAbsolutePath(), e);
077                    }                       
078            }
079            
080            private File file;
081            
082            public void setFile(File file) {
083                    this.file = file;
084            }
085    
086            public Object get(String name) {
087                    return objects.get(name);
088            }
089    }