Implement delete plugin

pf4j/src/main/java/ro/fortsoft/pf4j/DefaultPluginManager.java

@@ -257,12 +257,14 @@ public class DefaultPluginManager implements PluginManager {
         // expand all plugin archives
         FileFilter zipFilter = new ZipFileFilter();
         File[] zipFiles = pluginsDirectory.listFiles(zipFilter);
-        for (File zipFile : zipFiles) {
-        	try {
-				expandPluginArchive(zipFile);
-			} catch (IOException e) {
-				log.error(e.getMessage(), e);
-			}
+        if (zipFiles != null) {
+        	for (File zipFile : zipFiles) {
+        		try {
+        			expandPluginArchive(zipFile);
+        		} catch (IOException e) {
+        			log.error(e.getMessage(), e);
+        		}
+        	}
         }
 
         // check for no plugins
@@ -271,20 +273,24 @@ public class DefaultPluginManager implements PluginManager {
         filterList.add(new NotFileFilter(createHiddenPluginFilter()));
         FileFilter pluginsFilter = new AndFileFilter(filterList);
         File[] directories = pluginsDirectory.listFiles(pluginsFilter);
-        log.debug("Found possible {} plugins: {}", directories.length, Arrays.asList(directories));
-        if (directories.length == 0) {
+        List<File> dirArray = new ArrayList<File>();
+        if (directories != null) {
+        	dirArray.addAll(Arrays.asList(directories));
+        }
+        log.debug("Found possible {} plugins: {}", dirArray.size(), dirArray);
+        if (dirArray.size() == 0) {
         	log.info("No plugins");
         	return;
         }
 
         // load any plugin from plugins directory
-        for (File directory : directories) {
-            try {
-                loadPlugin(directory);
-            } catch (PluginException e) {
-				log.error(e.getMessage(), e);
-            }
-        }
+       	for (File directory : dirArray) {
+       		try {
+       			loadPlugin(directory);
+       		} catch (PluginException e) {
+       			log.error(e.getMessage(), e);
+       		}
+       	}
 
         // resolve 'unresolvedPlugins'
         try {
@@ -333,6 +339,51 @@ public class DefaultPluginManager implements PluginManager {
     	return false;
     }
 
+    @Override
+	public boolean deletePlugin(String pluginId) {
+    	if (!plugins.containsKey(pluginId)) {
+    		throw new IllegalArgumentException(String.format("Unknown pluginId %s", pluginId));
+    	}
+		PluginWrapper pw = getPlugin(pluginId);
+		PluginState state = stopPlugin(pluginId);
+
+		if (PluginState.STOPPED != state) {
+			log.error(String.format("Failed to stop plugin %s on delete", pluginId));
+			return false;
+		}
+
+		if (!unloadPlugin(pluginId)) {
+			log.error(String.format("Failed to unload plugin %s on delete", pluginId));
+			return false;
+		}
+
+		File pluginFolder = new File(pluginsDirectory, pw.getPluginPath());
+		File pluginZip = null;
+
+		FileFilter zipFilter = new ZipFileFilter();
+        File[] zipFiles = pluginsDirectory.listFiles(zipFilter);
+        if (zipFiles != null) {
+        	// strip prepended / from the plugin path
+        	String dirName = pw.getPluginPath().substring(1);
+        	// find the zip file that matches the plugin path
+        	for (File zipFile : zipFiles) {
+        		String name = zipFile.getName().substring(0, zipFile.getName().lastIndexOf('.'));
+        		if (name.equals(dirName)) {
+        			pluginZip = zipFile;
+        			break;
+        		}
+        	}
+        }
+
+		if (pluginFolder.exists()) {
+			FileUtils.delete(pluginFolder);
+		}
+		if (pluginZip != null && pluginZip.exists()) {
+			FileUtils.delete(pluginZip);
+		}
+		return true;
+	}
+
     /**
      * Get plugin class loader for this path.
      */

pf4j/src/main/java/ro/fortsoft/pf4j/PluginManager.java

@@ -79,6 +79,14 @@ public interface PluginManager {
      */
     public boolean unloadPlugin(String pluginId);
 
+    /**
+     * Deletes a plugin.
+     *
+     * @param pluginId
+     * @return true if the plugin was deleted
+     */
+    public boolean deletePlugin(String pluginId);
+
 	public PluginClassLoader getPluginClassLoader(String pluginId);
 
 	public <T> List<T> getExtensions(Class<T> type);

pf4j/src/main/java/ro/fortsoft/pf4j/util/FileUtils.java

@@ -1,11 +1,11 @@
 /*
  * Copyright 2012 Decebal Suiu
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with
  * the License. You may obtain a copy of the License in the LICENSE file, or at:
- * 
+ *
  * http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
  * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
  * specific language governing permissions and limitations under the License.
@@ -25,11 +25,11 @@ import java.util.List;
  */
 public class FileUtils {
 
-	public static List<String> readLines(File file, boolean ignoreComments) throws IOException {		
+	public static List<String> readLines(File file, boolean ignoreComments) throws IOException {
 		if (!file.exists() || !file.isFile()) {
 			return Collections.emptyList();
 		}
-		
+
 		List<String> lines = new ArrayList<String>();
 
 		BufferedReader reader = null;
@@ -46,8 +46,31 @@ public class FileUtils {
 				reader.close();
 			}
 		}
-		
+
 		return lines;
 	}
-	
+
+	/**
+	 * Delete a file or recursively delete a folder.
+	 *
+	 * @param fileOrFolder
+	 * @return true, if successful
+	 */
+	public static boolean delete(File fileOrFolder) {
+		boolean success = false;
+		if (fileOrFolder.isDirectory()) {
+			File [] files = fileOrFolder.listFiles();
+			if (files != null) {
+				for (File file : files) {
+					if (file.isDirectory()) {
+						success |= delete(file);
+					} else {
+						success |= file.delete();
+					}
+				}
+			}
+		}
+		success |= fileOrFolder.delete();
+		return success;
+	}
 }