rebuild plugin system

scm-webapp/src/main/java/sonia/scm/BindingExtensionProcessor.java

@@ -0,0 +1,226 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.inject.Binder;
+import com.google.inject.Module;
+import com.google.inject.multibindings.Multibinder;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import sonia.scm.plugin.ext.Extension;
+import sonia.scm.plugin.ext.ExtensionProcessor;
+import sonia.scm.repository.RepositoryHandler;
+import sonia.scm.security.EncryptionHandler;
+import sonia.scm.web.security.Authenticator;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class BindingExtensionProcessor implements ExtensionProcessor
+{
+
+  /** the logger for BindingExtensionProcessor */
+  private static final Logger logger =
+    LoggerFactory.getLogger(BindingExtensionProcessor.class);
+
+  //~--- constructors ---------------------------------------------------------
+
+  /**
+   * Constructs ...
+   *
+   *
+   */
+  public BindingExtensionProcessor()
+  {
+    this.moduleSet = new HashSet<Module>();
+    this.extensions = new HashSet<Class<?>>();
+  }
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param binder
+   */
+  @SuppressWarnings("unchecked")
+  public void bindExtensions(Binder binder)
+  {
+    Multibinder<RepositoryHandler> repositoryHandlers =
+      Multibinder.newSetBinder(binder, RepositoryHandler.class);
+
+    for (Class extensionClass : extensions)
+    {
+      try
+      {
+        if (RepositoryHandler.class.isAssignableFrom(extensionClass))
+        {
+          if (logger.isInfoEnabled())
+          {
+            logger.info("bind RepositoryHandler {}", extensionClass.getName());
+          }
+
+          binder.bind(extensionClass);
+
+          repositoryHandlers.addBinding().to(extensionClass);
+
+        }
+        else if (EncryptionHandler.class.isAssignableFrom(extensionClass))
+        {
+          bind(binder, EncryptionHandler.class, extensionClass);
+        }
+        else if (Authenticator.class.isAssignableFrom(extensionClass))
+        {
+          bind(binder, Authenticator.class, extensionClass);
+        }
+        else
+        {
+          if (logger.isInfoEnabled())
+          {
+            logger.info("bind {}", extensionClass.getName());
+          }
+
+          binder.bind(extensionClass);
+        }
+      }
+      catch (Exception ex)
+      {
+        logger.error(ex.getMessage(), ex);
+      }
+    }
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param extension
+   * @param extensionClass
+   */
+  @Override
+  public void processExtension(Extension extension, Class extensionClass)
+  {
+    if (Module.class.isAssignableFrom(extensionClass))
+    {
+      if (logger.isInfoEnabled())
+      {
+        logger.info("add GuiceModule {}", extensionClass.getName());
+      }
+
+      addModuleClass(extensionClass);
+    }
+    else
+    {
+      extensions.add(extensionClass);
+    }
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  public Set<Module> getModuleSet()
+  {
+    return moduleSet;
+  }
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param extensionClass
+   */
+  private void addModuleClass(Class<? extends Module> extensionClass)
+  {
+    try
+    {
+      Module module = extensionClass.newInstance();
+
+      moduleSet.add(module);
+    }
+    catch (Exception ex)
+    {
+      logger.error(ex.getMessage(), ex);
+    }
+  }
+
+  /**
+   * Method description
+   *
+   *
+   *
+   * @param binder
+   * @param type
+   * @param bindingType
+   * @param <T>
+   *
+   * @return
+   */
+  private <T> void bind(Binder binder, Class<T> type,
+                        Class<? extends T> bindingType)
+  {
+    if (logger.isDebugEnabled())
+    {
+      logger.debug("bind Authenticator {}", type.getName(),
+                   bindingType.getName());
+    }
+
+    binder.bind(type).to(bindingType);
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private Set<Class<?>> extensions;
+
+  /** Field description */
+  private Set<Module> moduleSet;
+}