001/*
002  GRANITE DATA SERVICES
003  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
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
021package org.granite.builder.properties;
022
023import java.io.File;
024import java.io.IOException;
025
026import org.eclipse.core.resources.IProject;
027import org.eclipse.core.runtime.CoreException;
028import org.granite.builder.properties.GraniteProperties;
029import org.granite.builder.util.FileUtil;
030import org.granite.builder.util.XStreamUtil;
031
032/**
033 * @author Franck WOLFF
034 */
035public class GranitePropertiesLoader {
036
037    private static final String FILE_NAME = ".granite";
038    private static final String DEFAULT_CHARSET = "UTF-8";
039
040        public static GraniteProperties load(IProject project) throws IOException {
041                File file = getPropertiesFile(project);
042        if (file.exists()) {
043                GraniteProperties properties = XStreamUtil.load(file, GraniteProperties.class, DEFAULT_CHARSET);
044                ValidationResults results = new ValidationResults();
045                properties.validate(results);
046                if (results.hasErrors())
047                        throw new IOException("Illegal '.granite' file in your project. " + results);
048                properties.setTimestamp(file.lastModified());
049                return properties;
050        }
051        return GraniteProperties.getDefaultProperties();
052        }
053        
054        public static void save(IProject project, GraniteProperties properties) throws IOException {
055                File file = getPropertiesFile(project);
056                XStreamUtil.save(file, properties, DEFAULT_CHARSET);
057        }
058        
059        public static boolean isOutdated(IProject project, GraniteProperties properties) {
060                File file = getPropertiesFile(project);
061                return properties == null || (file.exists() && file.lastModified() > properties.getTimestamp());
062        }
063        
064    public static File getPropertiesFile(IProject project) {
065        try {
066                return FileUtil.getLocationFile(project.getFile(FILE_NAME));
067        }
068        catch (CoreException e) {
069                throw new RuntimeException("Could not get " + FILE_NAME + " location file", e);
070        }
071    }
072    
073    public static boolean exists(IProject project) {
074        File propertiesFile = getPropertiesFile(project);
075        return propertiesFile != null && propertiesFile.exists();
076    }
077}