Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-after / ui / org / eclipse / jdt / internal / ui / wizards / buildpaths / ClasspathContainerDescriptor.java

diff --git a/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/ClasspathContainerDescriptor.java b/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/ClasspathContainerDescriptor.java
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+++ b/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/ClasspathContainerDescriptor.java
@@ -0,0 +1,138 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.ui.wizards.buildpaths;
+
+import java.util.ArrayList;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.Status;
+
+import org.eclipse.ui.activities.WorkbenchActivityHelper;
+
+import org.eclipse.jdt.core.IClasspathEntry;
+
+import org.eclipse.jdt.ui.JavaUI;
+import org.eclipse.jdt.ui.wizards.IClasspathContainerPage;
+
+import org.eclipse.jdt.internal.ui.JavaPlugin;
+import org.eclipse.jdt.internal.ui.util.CoreUtility;
+
+/**
+  */
+public class ClasspathContainerDescriptor {
+
+       private IConfigurationElement fConfigElement;
+       private IClasspathContainerPage fPage;
+
+       private static final String ATT_EXTENSION = "classpathContainerPage"; //$NON-NLS-1$
+
+       private static final String ATT_ID = "id"; //$NON-NLS-1$
+       private static final String ATT_NAME = "name"; //$NON-NLS-1$
+       private static final String ATT_PAGE_CLASS = "class"; //$NON-NLS-1$
+
+       public ClasspathContainerDescriptor(IConfigurationElement configElement) throws CoreException {
+               super();
+               fConfigElement = configElement;
+               fPage= null;
+
+               String id = fConfigElement.getAttribute(ATT_ID);
+               String name = configElement.getAttribute(ATT_NAME);
+               String pageClassName = configElement.getAttribute(ATT_PAGE_CLASS);
+
+               if (name == null) {
+                       throw new CoreException(new Status(IStatus.ERROR, JavaUI.ID_PLUGIN, 0, "Invalid extension (missing name): " + id, null)); //$NON-NLS-1$
+               }
+               if (pageClassName == null) {
+                       throw new CoreException(new Status(IStatus.ERROR, JavaUI.ID_PLUGIN, 0, "Invalid extension (missing page class name): " + id, null)); //$NON-NLS-1$
+               }
+       }
+
+       public IClasspathContainerPage createPage() throws CoreException  {
+               if (fPage == null) {
+                       Object elem= CoreUtility.createExtension(fConfigElement, ATT_PAGE_CLASS);
+                       if (elem instanceof IClasspathContainerPage) {
+                               fPage= (IClasspathContainerPage) elem;
+                       } else {
+                               String id= fConfigElement.getAttribute(ATT_ID);
+                               throw new CoreException(new Status(IStatus.ERROR, JavaUI.ID_PLUGIN, 0, "Invalid extension (page not of type IClasspathContainerPage): " + id, null)); //$NON-NLS-1$
+                       }
+               }
+               return fPage;
+       }
+
+       public IClasspathContainerPage getPage() {
+               return fPage;
+       }
+
+       public void setPage(IClasspathContainerPage page) {
+               fPage= page;
+       }
+
+       public void dispose() {
+               if (fPage != null) {
+                       fPage.dispose();
+                       fPage= null;
+               }
+       }
+
+       public String getName() {
+               return fConfigElement.getAttribute(ATT_NAME);
+       }
+
+       public String getPageClass() {
+               return fConfigElement.getAttribute(ATT_PAGE_CLASS);
+       }
+
+       public boolean canEdit(IClasspathEntry entry) {
+               String id = fConfigElement.getAttribute(ATT_ID);
+               if (entry.getEntryKind() == IClasspathEntry.CPE_CONTAINER) {
+                       String type = entry.getPath().segment(0);
+                       return id.equals(type);
+               }
+               return false;
+       }
+
+       public static ClasspathContainerDescriptor[] getDescriptors() {
+               ArrayList<ClasspathContainerDescriptor> containers= new ArrayList<ClasspathContainerDescriptor>();
+
+               IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(JavaUI.ID_PLUGIN, ATT_EXTENSION);
+               if (extensionPoint != null) {
+                       ClasspathContainerDescriptor defaultPage= null;
+                       String defaultPageName= ClasspathContainerDefaultPage.class.getName();
+
+                       IConfigurationElement[] elements = extensionPoint.getConfigurationElements();
+                       for (int i = 0; i < elements.length; i++) {
+                               try {
+                                       ClasspathContainerDescriptor curr= new ClasspathContainerDescriptor(elements[i]);
+                                       if (!WorkbenchActivityHelper.filterItem(curr)) {
+                                               if (defaultPageName.equals(curr.getPageClass())) {
+                                                       defaultPage= curr;
+                                               } else {
+                                                       containers.add(curr);
+                                               }
+                                       }
+                               } catch (CoreException e) {
+                                       JavaPlugin.log(e);
+                               }
+                       }
+                       if (defaultPageName != null && containers.isEmpty()) {
+                               // default page only added of no other extensions found
+                               containers.add(defaultPage);
+                       }
+               }
+               return containers.toArray(new ClasspathContainerDescriptor[containers.size()]);
+       }
+
+}