refactory: added UI removed from core plugin.

[phpeclipse.git] / net.sourceforge.phpeclipse.ui / src / net / sourceforge / phpdt / internal / ui / text / folding / JavaFoldingStructureProviderRegistry.java

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/folding/JavaFoldingStructureProviderRegistry.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/folding/JavaFoldingStructureProviderRegistry.java
new file mode 100644 (file)
index 0000000..2228c68
--- /dev/null
+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/folding/JavaFoldingStructureProviderRegistry.java
@@ -0,0 +1,135 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.ui.text.folding;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import net.sourceforge.phpdt.ui.PreferenceConstants;
+import net.sourceforge.phpdt.ui.text.folding.IJavaFoldingStructureProvider;
+//import net.sourceforge.phpeclipse.PHPeclipsePlugin;
+import net.sourceforge.phpeclipse.PHPeclipsePlugin;
+import net.sourceforge.phpeclipse.ui.WebUI;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtensionRegistry;
+import org.eclipse.core.runtime.Platform;
+
+/**
+ * @since 3.0
+ */
+public class JavaFoldingStructureProviderRegistry {
+
+       private static final String EXTENSION_POINT = "foldingStructureProviders"; //$NON-NLS-1$
+
+       /** The map of descriptors, indexed by their identifiers. */
+       private Map fDescriptors;
+
+       /**
+        * Creates a new instance.
+        */
+       public JavaFoldingStructureProviderRegistry() {
+       }
+
+       /**
+        * Returns an array of <code>IJavaFoldingProviderDescriptor</code>
+        * describing all extension to the <code>foldingProviders</code> extension
+        * point.
+        * 
+        * @return the list of extensions to the
+        *         <code>quickDiffReferenceProvider</code> extension point.
+        */
+       public JavaFoldingStructureProviderDescriptor[] getFoldingProviderDescriptors() {
+               synchronized (this) {
+                       ensureRegistered();
+                       return (JavaFoldingStructureProviderDescriptor[]) fDescriptors
+                                       .values()
+                                       .toArray(
+                                                       new JavaFoldingStructureProviderDescriptor[fDescriptors
+                                                                       .size()]);
+               }
+       }
+
+       /**
+        * Returns the folding provider with identifier <code>id</code> or
+        * <code>null</code> if no such provider is registered.
+        * 
+        * @param id
+        *            the identifier for which a provider is wanted
+        * @return the corresponding provider, or <code>null</code> if none can be
+        *         found
+        */
+       public JavaFoldingStructureProviderDescriptor getFoldingProviderDescriptor(
+                       String id) {
+               synchronized (this) {
+                       ensureRegistered();
+                       return (JavaFoldingStructureProviderDescriptor) fDescriptors
+                                       .get(id);
+               }
+       }
+
+       /**
+        * Instantiates and returns the provider that is currently configured in the
+        * preferences.
+        * 
+        * @return the current provider according to the preferences
+        */
+       public IJavaFoldingStructureProvider getCurrentFoldingProvider() {
+               String id = WebUI.getDefault().getPreferenceStore()
+                               .getString(PreferenceConstants.EDITOR_FOLDING_PROVIDER);
+               JavaFoldingStructureProviderDescriptor desc = getFoldingProviderDescriptor(id);
+               if (desc != null) {
+                       try {
+                               return desc.createProvider();
+                       } catch (CoreException e) {
+                               WebUI.log(e);
+                       }
+               }
+               return null;
+       }
+
+       /**
+        * Ensures that the extensions are read and stored in
+        * <code>fDescriptors</code>.
+        */
+       private void ensureRegistered() {
+               if (fDescriptors == null)
+                       reloadExtensions();
+       }
+
+       /**
+        * Reads all extensions.
+        * <p>
+        * This method can be called more than once in order to reload from a
+        * changed extension registry.
+        * </p>
+        */
+       public void reloadExtensions() {
+               IExtensionRegistry registry = Platform.getExtensionRegistry();
+               Map map = new HashMap();
+
+               IConfigurationElement[] elements = registry
+                               .getConfigurationElementsFor(PHPeclipsePlugin.getPluginId(),
+                                               EXTENSION_POINT);
+               for (int i = 0; i < elements.length; i++) {
+                       JavaFoldingStructureProviderDescriptor desc = new JavaFoldingStructureProviderDescriptor(
+                                       elements[i]);
+                       map.put(desc.getId(), desc);
+               }
+
+               synchronized (this) {
+                       fDescriptors = Collections.unmodifiableMap(map);
+               }
+       }
+
+}