// ========================================================================
   // Copyright (c) Webtide LLC
   // ------------------------------------------------------------------------
   // All rights reserved. This program and the accompanying materials
   // are made available under the terms of the Eclipse Public License v1.0
   // and Apache License v2.0 which accompanies this distribution.
   //
   // The Eclipse Public License is available at
   // http://www.eclipse.org/legal/epl-v10.html
  //
  // The Apache License v2.0 is available at
  // http://www.apache.org/licenses/LICENSE-2.0.txt
  //
  // You may elect to redistribute this code under either of these licenses.
  // ========================================================================
  
  package org.eclipse.jetty.start;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileFilter;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.io.StringReader;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.net.URL;
  import java.security.Policy;
  import java.text.CollationKey;
  import java.text.Collator;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.StringTokenizer;
  import java.util.TreeSet;
  
  /**
   * <p>
   * It allows an application to be started with the command <code>"java -jar start.jar"</code>.
   * </p>
   * 
   * <p>
   * The behaviour of Main is controlled by the <code>"org/eclipse/start/start.config"</code> file obtained as a resource
   * or file. This can be overridden with the START system property. The format of each line in this file is:
   * </p>
   * 
   * <p>
   * Each line contains entry in the format:
   * </p>
   * 
   * <pre>
   *   SUBJECT [ [!] CONDITION [AND|OR] ]*
   * </pre>
   * 
   * <p>
   * where SUBJECT:
   * </p>
   * <ul>
   * <li>ends with <code>".class"</code> is the Main class to run.</li>
   * <li>ends with <code>".xml"</code> is a configuration file for the command line</li>
   * <li>ends with <code>"/"</code> is a directory from which to add all jar and zip files.</li>
   * <li>ends with <code>"/*"</code> is a directory from which to add all unconsidered jar and zip files.</li>
   * <li>ends with <code>"/**"</code> is a directory from which to recursively add all unconsidered jar and zip files.</li>
   * <li>Containing <code>=</code> are used to assign system properties.</li>
   * <li>Containing <code>~=</code> are used to assign start properties.</li>
   * <li>Containing <code>/=</code> are used to assign a canonical path.</li>
   * <li>all other subjects are treated as files to be added to the classpath.</li>
   * </ul>
   * 
   * <p>
   * property expansion:
   * </p>
   * <ul>
   * <li><code>${name}</code> is expanded to a start property</li>
   * <li><code>$(name)</code> is expanded to either a start property or a system property.</li>
   * <li>The start property <code>${version}</code> is defined as the version of the start.jar</li>
   * </ul>
   * 
   * <p>
   * Files starting with <code>"/"</code> are considered absolute, all others are relative to the home directory.
   * </p>
   * 
   * <p>
   * CONDITION is one of:
   * </p>
   * <ul>
   * <li><code>always</code></li>
   * <li><code>never</code></li>
   * <li><code>available classname</code> - true if class on classpath</li>
  * <li><code>property name</code> - true if set as start property</li>
  * <li><code>system name</code> - true if set as system property</li>
  * <li><code>exists file</code> - true if file/dir exists</li>
  * <li><code>java OPERATOR version</code> - java version compared to literal</li>
  * <li><code>nargs OPERATOR number</code> - number of command line args compared to literal</li>
  * <li>OPERATOR := one of <code>"&lt;"</code>,<code>"&gt;"</code>,<code>"&lt;="</code>,<code>"&gt;="</code>,
  * <code>"=="</code>,<code>"!="</code></li>
  * </ul>
  * 
  * <p>
  * CONDITIONS can be combined with <code>AND</code> <code>OR</code> or <code>!</code>, with <code>AND</code> being the
  * assume operator for a list of CONDITIONS.
  * </p>
  * 
  * <p>
  * Classpath operations are evaluated on the fly, so once a class or jar is added to the classpath, subsequent available
  * conditions will see that class.
  * </p>
  * 
  * <p>
  * The configuration file may be divided into sections with option names like: [ssl,default]
  * </p>
  * 
  * <p>
  * Note: a special discovered section identifier <code>[=path_to_directory/*]</code> is allowed to auto-create section
  * IDs, based on directory names found in the path specified in the "path_to_directory/" part of the identifier.
  * </p>
  * 
  * <p>
  * Clauses after a section header will only be included if they match one of the tags in the options property. By
  * default options are set to "default,*" or the OPTIONS property may be used to pass in a list of tags, eg. :
  * </p>
  * 
  * <pre>
  *    java -jar start.jar OPTIONS=jetty,jsp,ssl
  * </pre>
  * 
  * <p>
  * The tag '*' is always appended to the options, so any section with the * tag is always applied.
  * </p>
  */
 public class Config
 {
     public static final String DEFAULT_SECTION = "";
     static
     {
         Package pkg = Config.class.getPackage();
         if (pkg != null && (pkg.getImplementationVersion() != null))
             _version = pkg.getImplementationVersion();
         else
             _version = System.getProperty("jetty.version","Unknown");
     }
 
     /**
      * Natural language sorting for key names.
      */
     private final Comparator<String> keySorter = new Comparator<String>()
     {
         private final Collator collator = Collator.getInstance();
 
         public int compare(String o1, String o2)
         {
             CollationKey key1 = collator.getCollationKey(o1);
             CollationKey key2 = collator.getCollationKey(o2);
             return key1.compareTo(key2);
         }
     };
 
     private static final String _version;
     private static boolean DEBUG = false;
     private final Map<String, Classpath> _classpaths = new HashMap<String, Classpath>();
     private final List<String> _xml = new ArrayList<String>();
     private final Set<String> _policies = new HashSet<String>();
     private String _classname = null;
     private final Set<String> _activeOptions = new TreeSet<String>(new Comparator<String>()
     {
         // Make sure "*" is always at the end of the list
         public int compare(String o1, String o2)
         {
             if ("*".equals(o1))
             {
                 return 1;
             }
             if ("*".equals(o2))
             {
                 return -1;
             }
             return o1.compareTo(o2);
         }
     });
     private final Map<String, String> _properties = new HashMap<String, String>();
     private int argCount = 0;
 
     private boolean addClasspathComponent(List<String> sections, String component)
     {
         for (String section : sections)
         {
             Classpath cp = _classpaths.get(section);
             if (cp == null)
                 cp = new Classpath();
 
             boolean added = cp.addComponent(component);
             _classpaths.put(section,cp);
 
             if (!added)
             {
                 // First failure means all failed.
                 return false;
             }
         }
 
         return true;
     }
 
     private boolean addClasspathPath(List<String> sections, String path)
     {
         for (String section : sections)
         {
             Classpath cp = _classpaths.get(section);
             if (cp == null)
             {
                 cp = new Classpath();
             }
             if (!cp.addClasspath(path))
             {
                 // First failure means all failed.
                 return false;
             }
             _classpaths.put(section,cp);
         }
 
         return true;
     }
 
     private void addJars(List<String> sections, File dir, boolean recurse) throws IOException
     {
         List<File> entries = new ArrayList<File>();
         File[] files = dir.listFiles();
         if (files == null)
         {
             // No files found, skip it.
             return;
         }
         entries.addAll(Arrays.asList(files));
         Collections.sort(entries,FilenameComparator.INSTANCE);
 
         for (File entry : entries)
         {
             if (entry.isDirectory())
             {
                 if (recurse)
                     addJars(sections,entry,recurse);
             }
             else
             {
                 String name = entry.getName().toLowerCase();
                 if (name.endsWith(".jar") || name.endsWith(".zip"))
                 {
                     String jar = entry.getCanonicalPath();
                     boolean added = addClasspathComponent(sections,jar);
                     debug((added?"  CLASSPATH+=":"  !") + jar);
                 }
             }
         }
     }
 
     private void close(InputStream stream)
     {
         if (stream == null)
             return;
 
         try
         {
             stream.close();
         }
         catch (IOException ignore)
         {
             /* ignore */
         }
     }
 
     private void close(Reader reader)
     {
         if (reader == null)
             return;
 
         try
         {
             reader.close();
         }
         catch (IOException ignore)
         {
             /* ignore */
         }
     }
 
     public static boolean isDebug()
     {
         return DEBUG;
     }
 
     public static void debug(String msg)
     {
         if (DEBUG)
         {
             System.err.println(msg);
         }
     }
 
     public static void debug(Throwable t)
     {
         if (DEBUG)
         {
             t.printStackTrace(System.err);
         }
     }
 
     private String expand(String s)
     {
         int i1 = 0;
         int i2 = 0;
         while (s != null)
         {
             i1 = s.indexOf("$(",i2);
             if (i1 < 0)
                 break;
             i2 = s.indexOf(")",i1 + 2);
             if (i2 < 0)
                 break;
             String name = s.substring(i1 + 2,i2);
             String property = getSystemProperty(name);
             s = s.substring(0,i1) + property + s.substring(i2 + 1);
         }
 
         i1 = 0;
         i2 = 0;
         while (s != null)
         {
             i1 = s.indexOf("${",i2);
             if (i1 < 0)
                 break;
             i2 = s.indexOf("}",i1 + 2);
             if (i2 < 0)
                 break;
             String name = s.substring(i1 + 2,i2);
             String property = getProperty(name);
             s = s.substring(0,i1) + property + s.substring(i2 + 1);
         }
 
         return s;
     }
 
     /**
      * Get the default classpath.
      * 
      * @return the default classpath
      */
     public Classpath getClasspath()
     {
         return _classpaths.get(DEFAULT_SECTION);
     }
 
     /**
      * Get the active classpath, as dictated by OPTIONS= entries.
      * 
      * @return the Active classpath
      * @see #getCombinedClasspath(Collection)
      */
     public Classpath getActiveClasspath()
     {
         return getCombinedClasspath(_activeOptions);
     }
 
     /**
      * Get the combined classpath representing the default classpath plus all named sections.
      * 
      * NOTE: the default classpath will be prepended, and the '*' classpath will be appended.
      * 
      * @param sectionIds
      *            the list of section ids to fetch
      * @return the {@link Classpath} representing combination all of the selected sectionIds, combined with the default
      *         section id, and '*' special id.
      */
     public Classpath getCombinedClasspath(Collection<String> sectionIds)
     {
         Classpath cp = new Classpath();
 
         cp.overlay(_classpaths.get(DEFAULT_SECTION));
         for (String sectionId : sectionIds)
         {
             Classpath otherCp = _classpaths.get(sectionId);
             if (otherCp == null)
             {
                 throw new IllegalArgumentException("No such OPTIONS: " + sectionId);
             }
             cp.overlay(otherCp);
         }
         cp.overlay(_classpaths.get("*"));
         return cp;
     }
 
     public String getMainClassname()
     {
         return _classname;
     }
 
     public String getProperty(String name)
     {
         if ("version".equalsIgnoreCase(name))
             return _version;
 
         return _properties.get(name);
     }
 
     public String getProperty(String name, String dftValue)
     {
         if (_properties.containsKey(name))
             return _properties.get(name);
         return dftValue;
     }
 
     /**
      * Get the classpath for the named section
      * 
      * @param sectionId
      * @return the classpath for the specified section id
      */
     public Classpath getSectionClasspath(String sectionId)
     {
         return _classpaths.get(sectionId);
     }
 
     /**
      * Get the list of section Ids.
      * 
      * @return the set of unique section ids
      */
     public Set<String> getSectionIds()
     {
         Set<String> ids = new TreeSet<String>(keySorter);
         ids.addAll(_classpaths.keySet());
         return ids;
     }
 
     private String getSystemProperty(String name)
     {
         if ("version".equalsIgnoreCase(name))
             return _version;
         if (_properties.containsKey(name))
             return _properties.get(name);
         return System.getProperty(name);
     }
 
     public List<String> getXmlConfigs()
     {
         return _xml;
     }
 
     private boolean isAvailable(List<String> sections, String classname)
     {
         // Try default/parent class loader first.
         try
         {
             Class.forName(classname);
             return true;
         }
         catch (NoClassDefFoundError e)
         {
             debug(e);
         }
         catch (ClassNotFoundException e)
         {
             debug("ClassNotFoundException (parent class loader): " + classname);
         }
 
         // Try section classloaders instead
         ClassLoader loader;
         Classpath classpath;
         for (String sectionId : sections)
         {
             classpath = _classpaths.get(sectionId);
             if (classpath == null)
             {
                 // skip, no classpath
                 continue;
             }
 
             loader = classpath.getClassLoader();
 
             try
             {
                 loader.loadClass(classname);
                 return true;
             }
             catch (NoClassDefFoundError e)
             {
                 debug(e);
             }
             catch (ClassNotFoundException e)
             {
                 debug("ClassNotFoundException (section class loader: " + sectionId + "): " + classname);
             }
         }
         return false;
     }
 
     /**
      * Parse the configuration
      * 
      * @param buf
      * @throws IOException
      */
     public void parse(CharSequence buf) throws IOException
     {
         parse(new StringReader(buf.toString()));
     }
 
     /**
      * Parse the configuration
      * 
      * @param stream the stream to read from
      * @throws IOException
      */
     public void parse(InputStream stream) throws IOException
     {
         InputStreamReader reader = null;
         try
         {
             reader = new InputStreamReader(stream);
             parse(reader);
         }
         finally
         {
             close(reader);
         }
     }
 
     public void parse(Reader reader) throws IOException
     {
         BufferedReader buf = null;
 
         try
         {
             buf = new BufferedReader(reader);
 
             List<String> sections = new ArrayList<String>();
             sections.add(DEFAULT_SECTION);
             _classpaths.put(DEFAULT_SECTION,new Classpath());
             Version java_version = new Version(System.getProperty("java.version"));
             Version ver = new Version();
 
             String line = null;
             while ((line = buf.readLine()) != null)
             {
                 String trim = line.trim();
                 if (trim.length() == 0) // empty line
                     continue;
 
                 if (trim.startsWith("#")) // comment
                     continue;
 
                 // handle options
                 if (trim.startsWith("[") && trim.endsWith("]"))
                 {
                     String identifier = trim.substring(1,trim.length() - 1);
 
                     // Normal case: section identifier (possibly separated by commas)
                     sections = Arrays.asList(identifier.split(","));
                     List<String> section_ids=new ArrayList<String>();
                     
                     // Ensure section classpaths exist
                     for (String sectionId : sections)
                     {
                         if (sectionId.charAt(0) == '=')
                             continue;
 
                         if (!_classpaths.containsKey(sectionId))
                             _classpaths.put(sectionId,new Classpath());
                         
                         section_ids.add(sectionId);
                     }
                     
 
                     // Process Dynamic
                     for (String sectionId : sections)
                     {
                         if (sectionId.charAt(0) != '=')
                             continue;
                         
                         section_ids = processDynamicSectionIdentifier(sectionId.substring(1),section_ids);
                     }
                     
                     sections = section_ids;
                     
                     continue;
                 }
 
                 try
                 {
                     StringTokenizer st = new StringTokenizer(line);
                     String subject = st.nextToken();
                     boolean expression = true;
                     boolean not = false;
                     String condition = null;
                     // Evaluate all conditions
                     while (st.hasMoreTokens())
                     {
                         condition = st.nextToken();
                         if (condition.equalsIgnoreCase("!"))
                         {
                             not = true;
                             continue;
                         }
                         if (condition.equalsIgnoreCase("OR"))
                         {
                             if (expression)
                                 break;
                             expression = true;
                             continue;
                         }
                         if (condition.equalsIgnoreCase("AND"))
                         {
                             if (!expression)
                                 break;
                             continue;
                         }
                         boolean eval = true;
                         if (condition.equals("true") || condition.equals("always"))
                         {
                             eval = true;
                         }
                         else if (condition.equals("false") || condition.equals("never"))
                         {
                             eval = false;
                         }
                         else if (condition.equals("available"))
                         {
                             String class_to_check = st.nextToken();
                             eval = isAvailable(sections,class_to_check);
                         }
                         else if (condition.equals("exists"))
                         {
                             try
                             {
                                 eval = false;
                                 File file = new File(expand(st.nextToken()));
                                 eval = file.exists();
                             }
                             catch (Exception e)
                             {
                                 debug(e);
                             }
                         }
                         else if (condition.equals("property"))
                         {
                             String property = getProperty(st.nextToken());
                             eval = property != null && property.length() > 0;
                         }
                         else if (condition.equals("system"))
                         {
                             String property = System.getProperty(st.nextToken());
                             eval = property != null && property.length() > 0;
                         }
                         else if (condition.equals("java"))
                         {
                             String operator = st.nextToken();
                             String version = st.nextToken();
                             ver.parse(version);
                             eval = (operator.equals("<") && java_version.compare(ver) < 0) || (operator.equals(">") && java_version.compare(ver) > 0)
                             || (operator.equals("<=") && java_version.compare(ver) <= 0) || (operator.equals("=<") && java_version.compare(ver) <= 0)
                             || (operator.equals("=>") && java_version.compare(ver) >= 0) || (operator.equals(">=") && java_version.compare(ver) >= 0)
                             || (operator.equals("==") && java_version.compare(ver) == 0) || (operator.equals("!=") && java_version.compare(ver) != 0);
                         }
                         else if (condition.equals("nargs"))
                         {
                             String operator = st.nextToken();
                             int number = Integer.parseInt(st.nextToken());
                             eval = (operator.equals("<") && argCount < number) || (operator.equals(">") && argCount > number)
                             || (operator.equals("<=") && argCount <= number) || (operator.equals("=<") && argCount <= number)
                             || (operator.equals("=>") && argCount >= number) || (operator.equals(">=") && argCount >= number)
                             || (operator.equals("==") && argCount == number) || (operator.equals("!=") && argCount != number);
                         }
                         else
                         {
                             System.err.println("ERROR: Unknown condition: " + condition);
                             eval = false;
                         }
                         expression &= not?!eval:eval;
                         not = false;
                     }
 
                     String file = expand(subject);
                     debug((expression?"T ":"F ") + line);
                     if (!expression)
                         continue;
 
                     // Setting of a start property
                     if (subject.indexOf("~=") > 0)
                     {
                         int i = file.indexOf("~=");
                         String property = file.substring(0,i);
                         String value = fixPath(file.substring(i + 2));
                         debug("  " + property + "~=" + value);
                         setProperty(property,value);
                         continue;
                     }
 
                     // Setting of start property with canonical path
                     if (subject.indexOf("/=") > 0)
                     {
                         int i = file.indexOf("/=");
                         String property = file.substring(0,i);
                         String value = fixPath(file.substring(i + 2));
                         String canonical = new File(value).getCanonicalPath();
                         debug("  " + property + "/=" + value + "==" + canonical);
                         setProperty(property,canonical);
                         continue;
                     }
 
                     // Setting of system property
                     if (subject.indexOf("=") > 0)
                     {
                         int i = file.indexOf("=");
                         String property = file.substring(0,i);
                         String value = fixPath(file.substring(i + 1));
                         debug("  " + property + "=" + value);
                         System.setProperty(property,value);
                         continue;
                     }
 
                     // Add all unconsidered JAR and ZIP files to classpath
                     if (subject.endsWith("/*"))
                     {
                         // directory of JAR files - only add jars and zips within the directory
                         File dir = new File(fixPath(file.substring(0,file.length() - 1)));
                         addJars(sections,dir,false);
                         continue;
                     }
 
                     // Recursively add all unconsidered JAR and ZIP files to classpath
                     if (subject.endsWith("/**"))
                     {
                         //directory hierarchy of jar files - recursively add all jars and zips in the hierarchy
                         File dir = new File(fixPath(file.substring(0,file.length() - 2)));
                         addJars(sections,dir,true);
                         continue;
                     }
 
                     // Add raw classpath directory to classpath
                     if (subject.endsWith("/"))
                     {
                         // class directory
                         File cd = new File(fixPath(file));
                         String d = cd.getCanonicalPath();
                         boolean added = addClasspathComponent(sections,d);
                         debug((added?"  CLASSPATH+=":"  !") + d);
                         continue;
                     }
 
                     // Add XML configuration
                     if (subject.toLowerCase().endsWith(".xml"))
                     {
                         // Config file
                         File f = new File(fixPath(file));
                         if (f.exists())
                             _xml.add(f.getCanonicalPath());
                         debug("  ARGS+=" + f);
                         continue;
                     }
 
                     // Set the main class to execute (overrides any previously set)
                     if (subject.toLowerCase().endsWith(".class"))
                     {
                         // Class
                         String cn = expand(subject.substring(0,subject.length() - 6));
                         if (cn != null && cn.length() > 0)
                         {
                             debug("  CLASS=" + cn);
                             _classname = cn;
                         }
                         continue;
                     }
 
                     // Add raw classpath entry
                     if (subject.toLowerCase().endsWith(".path"))
                     {
                         // classpath (jetty.class.path?) to add to runtime classpath
                         String cn = expand(subject.substring(0,subject.length() - 5));
                         if (cn != null && cn.length() > 0)
                         {
                             debug("  PATH=" + cn);
                             addClasspathPath(sections,cn);
                         }
                         continue;
                     }
 
                     // Add Security Policy file reference
                     if (subject.toLowerCase().endsWith(".policy"))
                     {
                         //policy file to parse
                         String cn = expand(subject.substring(0,subject.length()));
                         if (cn != null && cn.length() > 0)
                         {
                             debug("  POLICY=" + cn);
                             _policies.add(fixPath(cn));
                         }
                         continue;
                     }
 
                     // single JAR file
                     File f = new File(fixPath(file));
                     if (f.exists())
                     {
                         String d = f.getCanonicalPath();
                         boolean added = addClasspathComponent(sections,d);
                         if (!added)
                         {
                             added = addClasspathPath(sections,expand(subject));
                         }
                         debug((added?"  CLASSPATH+=":"  !") + d);
                     }
                 }
                 catch (Exception e)
                 {
                     System.err.println("on line: '" + line + "'");
                     e.printStackTrace();
                 }
             }
         }
         finally
         {
             close(buf);
         }
     }
 
     private List<String> processDynamicSectionIdentifier(String dynamicPathId,List<String> sections) throws IOException
     {
         String rawPath;
         boolean deep;
         
         if (dynamicPathId.endsWith("/*"))
         {
             deep=false;
             rawPath = fixPath(dynamicPathId.substring(0,dynamicPathId.length() - 1));
         }
         else if (dynamicPathId.endsWith("/**"))
         {
             deep=true;
             rawPath = fixPath(dynamicPathId.substring(0,dynamicPathId.length() - 2));
         }
         else 
         {
             String msg = "Illegal dynamic path [" + dynamicPathId + "]";
             throw new IOException(msg);
         }
         
         File parentDir = new File(expand(rawPath));
         if (!parentDir.exists())
             return sections;
         debug("dynamic: " + parentDir);
 
         File dirs[] = parentDir.listFiles(new FileFilter()
         {
             public boolean accept(File path)
             {
                 return path.isDirectory();
             }
         });
 
         List<String> dyn_sections = new ArrayList<String>();
         List<String> super_sections = new ArrayList<String>();
         if (sections!=null)
             super_sections.addAll(sections);
         
         for (File dir : dirs)
         {
             String id = dir.getName();
             if (!_classpaths.keySet().contains(id))
                 _classpaths.put(id, new Classpath());
             
             dyn_sections.clear();
             if (sections!=null)
                 dyn_sections.addAll(sections);
             dyn_sections.add(id);
             super_sections.add(id);
             debug("dynamic: " + dyn_sections);
             addJars(dyn_sections,dir,deep);
         }
         
         return super_sections;
     }
 
     private String fixPath(String path)
     {
         return path.replace('/',File.separatorChar);
     }
 
     public void parse(URL url) throws IOException
     {
         InputStream stream = null;
         InputStreamReader reader = null;
         try
         {
             stream = url.openStream();
             reader = new InputStreamReader(stream);
             parse(reader);
         }
         finally
         {
             close(reader);
             close(stream);
         }
     }
 
     public void setArgCount(int argCount)
     {
         this.argCount = argCount;
     }
 
     public void setProperty(String name, String value)
     {
         if (name.equals("DEBUG"))
         {
             DEBUG = Boolean.parseBoolean(value);
             if (DEBUG)
             {
                 System.setProperty("org.eclipse.jetty.util.log.stderr.DEBUG","true");
                 System.setProperty("org.eclipse.jetty.start.DEBUG","true");
             }
         }
         if (name.equals("OPTIONS"))
         {
             _activeOptions.clear();
             String ids[] = value.split(",");
             for (String id : ids)
             {
                 addActiveOption(id);
             }
         }
         _properties.put(name,value);
     }
 
     public Policy getPolicyInstance(ClassLoader cl) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException,
     InstantiationException, IllegalAccessException, InvocationTargetException
     {
         Class<?> jettyPolicy = cl.loadClass("org.eclipse.jetty.policy.JettyPolicy");
         Constructor<?> c = jettyPolicy.getConstructor(new Class[]
                                                                 { Set.class, Map.class });
         Object policyClass = c.newInstance(_policies,_properties);
 
         if (policyClass instanceof Policy)
         {
             Policy p = (Policy)policyClass;
             p.refresh();
             return (Policy)policyClass;
         }
 
         throw new ClassCastException("Unable to cast to " + Policy.class.getName() + " : " + policyClass.getClass().getName());
     }
 
     public void addActiveOption(String option)
     {
         if (!_activeOptions.contains(option))
         {
             _activeOptions.add(option);
         }
         _properties.put("OPTIONS",join(_activeOptions,","));
     }
 
     public Set<String> getActiveOptions()
     {
         return _activeOptions;
     }
 
     public void removeActiveOption(String option)
     {
         _activeOptions.remove(option);
         _properties.put("OPTIONS",join(_activeOptions,","));
     }
 
     private String join(Collection<?> coll, String delim)
     {
         StringBuffer buf = new StringBuffer();
 
         Iterator<?> i = coll.iterator();
         boolean hasNext = i.hasNext();
         while (hasNext)
         {
             buf.append(String.valueOf(i.next()));
             hasNext = i.hasNext();
             if (hasNext)
                 buf.append(delim);
         }
 
         return buf.toString();
     }
 }