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 */
022package org.granite.scan;
023
024import java.io.InputStream;
025import java.util.Properties;
026
027import org.granite.logging.Logger;
028
029/**
030 * @author Franck WOLFF
031 */
032public class ScannerFactory {
033        
034        private static final Logger log = Logger.getLogger(ScannerFactory.class);
035
036        
037        public static Scanner createScanner(ScannedItemHandler handler, String marker) {
038        if (isVFSAvailable() && !isEmbedded() && isJBoss(5)) {
039                log.debug("Using VFS aware scanner");
040                try {
041                        Class<?> vfsScannerClass = ScannerFactory.class.getClassLoader().loadClass("org.granite.scan.VFSScanner");
042                        return (Scanner)vfsScannerClass.getConstructor(ScannedItemHandler.class, String.class).newInstance(handler, marker);                    
043                }
044                catch (Exception e) {
045                        throw new RuntimeException("Could not create VFSScanner", e);
046                }
047        }
048        if (isVFS3Available() && !isEmbedded() && isJBoss(6)) {
049                log.debug("Using VFS3 aware scanner");
050                try {
051                        Class<?> vfsScannerClass = ScannerFactory.class.getClassLoader().loadClass("org.granite.scan.VFS3Scanner");
052                        return (Scanner)vfsScannerClass.getConstructor(ScannedItemHandler.class, String.class).newInstance(handler, marker);                    
053                }
054                catch (Exception e) {
055                        throw new RuntimeException("Could not create VFS3Scanner", e);
056                }
057        }
058        
059        log.debug("Using default Scanner");
060        return new URLScanner(handler, marker);
061        }
062   
063        private static boolean isVFSAvailable() {
064                try {
065                        Class.forName("org.jboss.virtual.VFS");
066                        log.trace("VFS detected");
067                        return true;
068                }
069                catch (Throwable t) {
070                        return false;
071                }
072        }
073           
074        private static boolean isVFS3Available() {
075                try {
076                        Class.forName("org.jboss.vfs.VFS");
077                        log.trace("VFS3 detected");
078                        return true;
079                }
080                catch (Throwable t) {
081                        return false;
082                }
083        }
084        
085        private static boolean isJBoss(int version) {
086                try {
087                        Properties props = new Properties();
088                        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("/org/jboss/version.properties");
089                        if (is == null)
090                                is = Thread.currentThread().getContextClassLoader().getResourceAsStream("org/jboss/version.properties");
091                        if (is != null) {
092                                // JBoss AS 4, 5, 6
093                                props.load(is);
094                                is.close();
095                                int major = Integer.parseInt(props.getProperty("version.major"));
096                                int minor = Integer.parseInt(props.getProperty("version.minor"));
097                                
098                                boolean isJBossVersion = major >= version && minor >= 0;
099                                if (isJBossVersion)
100                                        log.trace("JBoss " + major + "." + minor + " detected");
101                                
102                                return isJBossVersion;
103                        }
104                        
105                        // JBoss AS 7 ?
106                        log.trace("JBoss AS 7+ detected");
107                        
108                        return true;
109                }
110                catch (Throwable t) {
111                        return false;
112                }
113        }
114        
115        private static boolean isEmbedded() {
116                try {
117                        Class.forName("org.jboss.embedded.Bootstrap");
118                        log.trace("JBoss Embedded detected");
119                        return true;
120                }
121                catch (Throwable t) {
122                        return false;
123                }
124        }
125}