Clean PluginStatusProvider api

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

@@ -75,9 +75,6 @@ public class DefaultPluginManager implements PluginManager {
      */
     private List<PluginWrapper> startedPlugins;
 
-    private List<String> enabledPlugins;
-    private List<String> disabledPlugins;
-
     /**
      * The registered {@link PluginStateListener}s.
      */
@@ -96,6 +93,7 @@ public class DefaultPluginManager implements PluginManager {
 
     private PluginFactory pluginFactory;
     private ExtensionFactory extensionFactory;
+    private PluginStatusProvider pluginStatusProvider;
 
     /**
      * The plugins directory is supplied by System.getProperty("pf4j.pluginsDir", "plugins").
@@ -446,14 +444,10 @@ public class DefaultPluginManager implements PluginManager {
 
             firePluginStateEvent(new PluginStateEvent(this, pluginWrapper, PluginState.STOPPED));
 
-            if (disabledPlugins.add(pluginId)) {
-                try {
-                    FileUtils.writeLines(disabledPlugins, new File(pluginsDirectory, "disabled.txt"));
-                } catch (IOException e) {
-                    log.error("Failed to disable plugin {}", pluginId, e);
-                    return false;
-                }
+            if (!pluginStatusProvider.disablePlugin(pluginId)) {
+                return false;
             }
+            
             log.info("Disabled plugin '{}:{}'", pluginDescriptor.getPluginId(), pluginDescriptor.getVersion());
 
             return true;
@@ -482,12 +476,7 @@ public class DefaultPluginManager implements PluginManager {
             return true;
         }
 
-        try {
-            if (disabledPlugins.remove(pluginId)) {
-                FileUtils.writeLines(disabledPlugins, new File(pluginsDirectory, "disabled.txt"));
-            }
-        } catch (IOException e) {
-            log.error("Failed to enable plugin {}", pluginId, e);
+        if (!pluginStatusProvider.enablePlugin(pluginId)) {
             return false;
         }
 
@@ -659,42 +648,12 @@ public class DefaultPluginManager implements PluginManager {
     }
 
     protected PluginStatusProvider createPluginStatusProvider() {
-        return new PluginStatusProvider() {
-
-            @Override
-            public List<String> getEnabledPlugins() {
-                List<String> enabledPlugins = Collections.emptyList();
-                try {
-                    // create a list with plugin identifiers that should be only accepted by this manager (whitelist from plugins/enabled.txt file)
-                    enabledPlugins = FileUtils.readLines(new File(pluginsDirectory, "enabled.txt"), true);
-                    log.info("Enabled plugins: {}", enabledPlugins);
-                } catch (IOException e) {
-                    log.error(e.getMessage(), e);
-                }
-                return enabledPlugins;
-            }
-
-            @Override
-            public List<String> getDisabledPlugins() {
-                List<String> disabledPlugins = Collections.emptyList();
-                try {
-                    // create a list with plugin identifiers that should not be accepted by this manager (blacklist from plugins/disabled.txt file)
-                    disabledPlugins = FileUtils.readLines(new File(pluginsDirectory, "disabled.txt"), true);
-                    log.info("Disabled plugins: {}", disabledPlugins);
-                } catch (IOException e) {
-                    log.error(e.getMessage(), e);
-                }
-                return disabledPlugins;
-            }
-        };
+        return new DefaultPluginStatusProvider(pluginsDirectory);
     }
 
     protected boolean isPluginDisabled(String pluginId) {
-    	if (enabledPlugins.isEmpty()) {
-    		return disabledPlugins.contains(pluginId);
-    	}
 
-    	return !enabledPlugins.contains(pluginId);
+    	return pluginStatusProvider.isPluginDisabled(pluginId);
     }
 
     protected boolean isPluginValid(PluginWrapper pluginWrapper) {
@@ -759,7 +718,6 @@ public class DefaultPluginManager implements PluginManager {
         unresolvedPlugins = new ArrayList<PluginWrapper>();
         resolvedPlugins = new ArrayList<PluginWrapper>();
         startedPlugins = new ArrayList<PluginWrapper>();
-        disabledPlugins = new ArrayList<String>();
 
         pluginStateListeners = new ArrayList<PluginStateListener>();
 
@@ -770,11 +728,7 @@ public class DefaultPluginManager implements PluginManager {
         extensionFactory = createExtensionFactory();
         pluginDescriptorFinder = createPluginDescriptorFinder();
         extensionFinder = createExtensionFinder();
-
-        PluginStatusProvider statusLists = createPluginStatusProvider();
-
-        enabledPlugins = statusLists.getEnabledPlugins();
-        disabledPlugins = statusLists.getDisabledPlugins();
+        pluginStatusProvider = createPluginStatusProvider();
 
         System.setProperty("pf4j.pluginsDir", pluginsDirectory.getAbsolutePath());
 	}

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

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2014 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.
+ */
+package ro.fortsoft.pf4j;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import ro.fortsoft.pf4j.util.FileUtils;
+
+/**
+ * The default implementation for PluginStatusProvider.
+ *
+ * @author Decebal Suiu
+ * @author Mário Franco
+ */
+public class DefaultPluginStatusProvider implements PluginStatusProvider {
+
+    private static final Logger log = LoggerFactory.getLogger(DefaultPluginStatusProvider.class);
+
+    private final File pluginsDirectory;
+
+    private List<String> enabledPlugins = new ArrayList<String>();
+    private List<String> disabledPlugins = new ArrayList<String>();
+
+    public DefaultPluginStatusProvider(File pluginsDirectory) {
+        this.pluginsDirectory = pluginsDirectory;
+        initialize();
+    }
+
+    private void initialize() {
+        try {
+            // create a list with plugin identifiers that should be only accepted by this manager (whitelist from plugins/enabled.txt file)
+            enabledPlugins = FileUtils.readLines(new File(pluginsDirectory, "enabled.txt"), true);
+            log.info("Enabled plugins: {}", enabledPlugins);
+
+            // create a list with plugin identifiers that should not be accepted by this manager (blacklist from plugins/disabled.txt file)
+            disabledPlugins = FileUtils.readLines(new File(pluginsDirectory, "disabled.txt"), true);
+            log.info("Disabled plugins: {}", disabledPlugins);
+        } catch (IOException e) {
+            log.error(e.getMessage(), e);
+        }
+    }
+
+    @Override
+    public boolean isPluginDisabled(String pluginId) {
+        if (enabledPlugins.isEmpty()) {
+            return disabledPlugins.contains(pluginId);
+        }
+
+        return !enabledPlugins.contains(pluginId);
+    }
+
+    @Override
+    public boolean disablePlugin(String pluginId) {
+        if (disabledPlugins.add(pluginId)) {
+            try {
+                FileUtils.writeLines(disabledPlugins, new File(pluginsDirectory, "disabled.txt"));
+            } catch (IOException e) {
+                log.error("Failed to disable plugin {}", pluginId, e);
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean enablePlugin(String pluginId) {
+        try {
+            if (disabledPlugins.remove(pluginId)) {
+                FileUtils.writeLines(disabledPlugins, new File(pluginsDirectory, "disabled.txt"));
+            }
+        } catch (IOException e) {
+            log.error("Failed to enable plugin {}", pluginId, e);
+            return false;
+        }
+        return true;
+    }
+
+}

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

@@ -12,8 +12,6 @@
  */
 package ro.fortsoft.pf4j;
 
-import java.util.List;
-
 /**
  * @author Decebal Suiu
  * @author Mário Franco
@@ -21,13 +19,27 @@ import java.util.List;
 public interface PluginStatusProvider {
 
     /**
-     * Retrieves a list with plugin identifiers that should be only accepted by this manager
+     * Checks if the plugin is disabled or not
+     *
+     * @param pluginId the plugin id
+     * @return if the plugin is disabled or not
+     */
+    public boolean isPluginDisabled(String pluginId);
+
+    /**
+     * Disables a plugin from being loaded.
+     *
+     * @param pluginId
+     * @return true if plugin is disabled
      */
-    public List<String> getEnabledPlugins();
+    public boolean disablePlugin(String pluginId);
 
     /**
-     * Retrieves a list with plugin identifiers that should not be accepted by this manager
+     * Enables a plugin that has previously been disabled.
+     *
+     * @param pluginId
+     * @return true if plugin is enabled
      */
-    public List<String> getDisabledPlugins();
+    public boolean enablePlugin(String pluginId);
 
 }