added the ability to list all modules in the module directory

src/dynamo-framework/com/silverwrist/dynamo/module/ModuleManager.java

@@ -20,6 +20,7 @@ package com.silverwrist.dynamo.module;
 import java.io.*;
 import java.net.MalformedURLException;
 import java.util.*;
+import java.util.jar.*;
 import org.w3c.dom.*;
 import com.silverwrist.util.xml.*;
 import com.silverwrist.dynamo.Namespaces;
@@ -53,6 +54,61 @@ public class ModuleManager implements NamedObject, ComponentInitialize, Componen
   { // do nothing
   } // end constructor
 
+  /*--------------------------------------------------------------------------------
+   * Internal operations
+   *--------------------------------------------------------------------------------
+   */
+
+  private static final void pushFileList(LinkedList list, File file)
+  {
+    File[] subfiles = file.listFiles();
+    if (subfiles==null)
+      return;
+    Arrays.sort(subfiles);
+    for (int i=subfiles.length-1; i>=0; i--)
+      list.addFirst(subfiles[i]);
+
+  } // end pushFileList
+
+  private static final boolean isDynamoModule(File f)
+  {
+    JarFile jf = null;
+    try
+    { // open this file as a JAR file
+      jf = new JarFile(f);
+      Manifest mft = jf.getManifest();
+      if (mft==null)
+	return false;
+      Attributes attrs = mft.getMainAttributes();
+      if (attrs==null)
+	return false;
+      if (attrs.getValue("X-Dynamo-Module-Class")!=null)
+	return true;
+
+    } // end try
+    catch (IOException e)
+    { // if there's an exception, we just bail
+      return false;
+
+    } // end catch
+    finally
+    { // clean up before we go
+      try
+      { // close the file
+	if (jf!=null)
+	  jf.close();
+
+      } // end try
+      catch (IOException e)
+      { // ignore exceptions
+      } // end catch
+
+    } // end finally
+
+    return false;
+
+  } // end isDynamoModule
+
   /*--------------------------------------------------------------------------------
    * Implementations from interface NamedObject
    *--------------------------------------------------------------------------------
@@ -255,4 +311,33 @@ public class ModuleManager implements NamedObject, ComponentInitialize, Componen
 
   } // end freeUnusedModules
 
+  public List listAllModuleNames()
+  {
+    ArrayList rc = new ArrayList();
+    int len = m_mod_dir.getAbsolutePath().length();
+    LinkedList process = new LinkedList();
+    pushFileList(process,m_mod_dir);
+    while (process.size()>0)
+    { // examine all files
+      File f = (File)(process.removeFirst());
+      if (f.isDirectory())
+	pushFileList(process,f);  // list files in the subdirectory
+      else if (isDynamoModule(f))
+      { // strip off the base path and return the name
+	String name = f.getAbsolutePath().substring(len);
+	if (name.startsWith(File.pathSeparator))
+	  name = name.substring(File.pathSeparator.length());
+	rc.add(name);
+
+      } // end else if
+
+    } // end while
+
+    if (rc.isEmpty())
+      return Collections.EMPTY_LIST;
+    rc.trimToSize();
+    return Collections.unmodifiableList(rc);
+
+  } // end listAllModuleNames
+
 } // end class ModuleManager

src/dynamo-framework/com/silverwrist/dynamo/module/ModuleOperations.java

@@ -17,6 +17,7 @@
  */
 package com.silverwrist.dynamo.module;
 
+import java.util.List;
 import com.silverwrist.dynamo.except.ModuleException;
 import com.silverwrist.dynamo.iface.Module;
 
@@ -28,4 +29,6 @@ public interface ModuleOperations
 
   public void freeUnusedModules();
 
+  public List listAllModuleNames();
+
 } // end interface ModuleOperations