/* 
    P/P   *  Method: org.apache.roller.weblogger.util.StandaloneWebappClassLoader$1__static_init
          */
     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   *  contributor license agreements.  The ASF licenses this file to You
     4   * under the Apache License, Version 2.0 (the "License"); you may not
     5   * use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.  For additional information regarding
    15   * copyright in this work, please see the NOTICE file in the top level
    16   * directory of this distribution.
    17   *
    18   * StandaloneWebappClassLoader.java
    19   * Created on October 20, 2006, 11:11 PM
    20   */
    21  
    22  package org.apache.roller.weblogger.util;
    23  
    24  import java.io.File;
    25  import java.io.FilenameFilter;
    26  import java.net.URL;
    27  import java.net.URLClassLoader;
    28  import java.util.ArrayList;
    29  import java.util.List;
    30  
    31  /**
    32   * ClassLoader to enable running webapp classes outside of webapp.  
    33   * You provide webappDir and jarsDir paths and the classloader will include 
    34   * webappDir/WEB-INF/classes, webappDir/WEB-INF/lib/*jar and jarsDir/*.jar.
    35   */
    36  public class StandaloneWebappClassLoader extends URLClassLoader {
             /* 
    P/P       *  Method: org.apache.roller.weblogger.util.StandaloneWebappClassLoader__static_init
              * 
              *  Presumptions:
              *    init'ed(java.io.File.separator)
              * 
              *  Postconditions:
              *    FS == java.io.File.separator
              *    (soft) init'ed(FS)
              */
    37      public static String FS = File.separator;
    38      
    39      /** Use calling class's parent classloader */
    40      public StandaloneWebappClassLoader(String webappDir, String jarsDir) throws Exception {
                 /* 
    P/P           *  Method: void org.apache.roller.weblogger.util.StandaloneWebappClassLoader(String, String)
                  * 
                  *  Preconditions:
                  *    init'ed(FS)
                  */
    41          super(buildURLsArray(webappDir, jarsDir));
    42      }
    43      
    44      /** Use a specific parent classloader, or null for no parent */
    45      public StandaloneWebappClassLoader(String webappDir, String jarsDir, ClassLoader cl) throws Exception {
                 /* 
    P/P           *  Method: void org.apache.roller.weblogger.util.StandaloneWebappClassLoader(String, String, ClassLoader)
                  * 
                  *  Preconditions:
                  *    init'ed(FS)
                  */
    46          super(buildURLsArray(webappDir, jarsDir), cl);
    47      }
    48      
    49      private static URL[] buildURLsArray(String webappDir, String jarsDir) throws Exception {
    50          // Create collection of URLs needed for classloader
                 /* 
    P/P           *  Method: URL[] buildURLsArray(String, String)
                  * 
                  *  Preconditions:
                  *    init'ed(FS)
                  * 
                  *  Presumptions:
                  *    java.util.List:size(...)@64 >= 0
                  * 
                  *  Postconditions:
                  *    init'ed(return_value)
                  */
    51          List urlList = new ArrayList();
    52  
    53          // Add WEB-INF/lib jars
    54          String libPath = webappDir + FS + "WEB-INF" + FS + "lib";
    55          addURLs(libPath, urlList);
    56          
    57          // Added WEB-INF/classes
    58          String classesPath = webappDir + FS + "WEB-INF" + FS + "classes" + FS;
    59          urlList.add(new URL("file://" + classesPath));
    60          
    61          // Add additional jars
    62          addURLs(jarsDir, urlList);
    63                  
    64          return (URL[])urlList.toArray(new URL[urlList.size()]);  
    65      }
    66      
    67      private static void addURLs(String dirPath, List urlList) throws Exception {
                 /* 
    P/P           *  Method: void addURLs(String, List)
                  * 
                  *  Preconditions:
                  *    (soft) init'ed(FS)
                  *    (soft) urlList != null
                  * 
                  *  Presumptions:
                  *    java.io.File:list(...)@69 != null
                  *    libJarNames.length@69 <= 232-1
                  */
    68          File libDir = new File(dirPath);
                 /* 
    P/P           *  Method: void org.apache.roller.weblogger.util.StandaloneWebappClassLoader$1()
                  */
    69          String[] libJarNames = libDir.list(new FilenameFilter() {
    70              public boolean accept(File dir, String pathname) {
                         /* 
    P/P                   *  Method: bool accept(File, String)
                          * 
                          *  Preconditions:
                          *    pathname != null
                          * 
                          *  Postconditions:
                          *    init'ed(return_value)
                          * 
                          *  Test Vectors:
                          *    java.lang.String:endsWith(...)@71: {0}, {1}
                          */
    71                  if (pathname.endsWith(".jar")) {
    72                      return true;
    73                  }
    74                  return false;
    75              }
    76          });       
    77          for (int i=0; i<libJarNames.length; i++) {
    78              String url = "file://" + dirPath + FS + libJarNames[i];
    79              urlList.add(new URL(url));
    80          }
    81      }
    82  }