001 /* 002 * Copyright (C) 2010 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.vfs.spi.servlet; 021 022 import org.crsh.vfs.spi.AbstractFSDriver; 023 024 import javax.servlet.ServletContext; 025 import java.io.File; 026 import java.io.IOException; 027 import java.net.URL; 028 import java.util.regex.Matcher; 029 import java.util.regex.Pattern; 030 031 /** 032 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 033 * @version $Revision$ 034 */ 035 public class ServletContextDriver extends AbstractFSDriver<String> { 036 037 /** A valid path. */ 038 static final Pattern pathPattern = Pattern.compile("^(?=/).*?((?<=/)[^/]*)?(/?)$"); 039 040 /** . */ 041 private final ServletContext ctx; 042 043 public ServletContextDriver(ServletContext ctx) { 044 if (ctx == null) { 045 throw new NullPointerException(); 046 } 047 048 // 049 this.ctx = ctx; 050 } 051 052 public String root() throws IOException { 053 return "/"; 054 } 055 056 public String name(String file) throws IOException { 057 return matcher(file).group(1); 058 } 059 060 public boolean isDir(String file) throws IOException { 061 Matcher matcher = matcher(file); 062 String slash = matcher.group(2); 063 return "/".equals(slash); 064 } 065 066 public Iterable<String> children(String parent) throws IOException { 067 return ctx.getResourcePaths(parent); 068 } 069 070 /** 071 * The implementation attempts to get an URL that will be valid for the file system first (when the 072 * war is usually exploded) and if it is not able, it will delegate to {@link ServletContext#getResource(String)}. 073 * 074 * @param file the file path 075 * @return the URL 076 * @throws IOException any io exception 077 */ 078 public URL toURL(String file) throws IOException { 079 String realPath = ctx.getRealPath(file); 080 if (realPath != null) { 081 File realFile = new File(realPath); 082 if (realFile.exists() && realFile.isFile()) { 083 return realFile.toURI().toURL(); 084 } 085 } 086 return ctx.getResource(file); 087 } 088 089 private Matcher matcher(String path) { 090 Matcher m = pathPattern.matcher(path); 091 if (m.matches()) { 092 return m; 093 } else { 094 throw new IllegalArgumentException("Illegal path " + path); 095 } 096 } 097 }