Add Plugin status provider

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

@@ -658,6 +658,37 @@ public class DefaultPluginManager implements PluginManager {
     	return new PluginClasspath();
     }
 
+    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;
+            }
+        };
+    }
+
     protected boolean isPluginDisabled(String pluginId) {
     	if (enabledPlugins.isEmpty()) {
     		return disabledPlugins.contains(pluginId);
@@ -740,17 +771,10 @@ public class DefaultPluginManager implements PluginManager {
         pluginDescriptorFinder = createPluginDescriptorFinder();
         extensionFinder = createExtensionFinder();
 
-        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);
+        PluginStatusProvider statusLists = createPluginStatusProvider();
 
-        	// 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);
-        }
+        enabledPlugins = statusLists.getEnabledPlugins();
+        disabledPlugins = statusLists.getDisabledPlugins();
 
         System.setProperty("pf4j.pluginsDir", pluginsDirectory.getAbsolutePath());
 	}

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

@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+package ro.fortsoft.pf4j;
+
+import java.util.List;
+
+/**
+ * @author Decebal Suiu
+ * @author Mário Franco
+ */
+public interface PluginStatusProvider {
+
+    /**
+     * Retrieves a list with plugin identifiers that should be only accepted by this manager
+     */
+    public List<String> getEnabledPlugins();
+
+    /**
+     * Retrieves a list with plugin identifiers that should not be accepted by this manager
+     */
+    public List<String> getDisabledPlugins();
+
+}