Bug 479184

Created by: nickstanish

XMLPersistenceExtensionFactory pulls in IJAXBClassProviders from interface. Added static method to ICompositeItemBuilder for getting list of registered extensions of that interface.

Signed-off-by: Nick Stanish nickstanish@gmail.com

org.eclipse.ice.item/src/org/eclipse/ice/item/ICompositeItemBuilder.java

@@ -8,12 +8,19 @@
  * Contributors:
  *   Initial API and implementation and/or initial documentation - Jay Jay Billings,
  *   Jordan H. Deyton, Dasha Gorin, Alexander J. McCaskey, Taylor Patterson,
- *   Claire Saunders, Matthew Wang, Anna Wojtowicz
+ *   Claire Saunders, Matthew Wang, Anna Wojtowicz, Nick Stanish
  *******************************************************************************/
 package org.eclipse.ice.item;
 
 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.Platform;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * <p>
  * This class builds Items that depend on other Items. These "composite Items"
@@ -23,9 +30,13 @@ import java.util.ArrayList;
  * ICompositeItemBuilder.addBuilders().
  * </p>
  * 
- * @author Jay Jay Billings
+ * @author Jay Jay Billings, Nick Stanish
  */
 public interface ICompositeItemBuilder extends ItemBuilder {
+	
+	public static final String EXTENSION_ID = "org.eclipse.ice.item.compositeItemBuilder";
+	
+	
 
 	/**
 	 * <p>
@@ -42,4 +53,41 @@ public interface ICompositeItemBuilder extends ItemBuilder {
 	 *            </p>
 	 */
 	public void addBuilders(ArrayList<ItemBuilder> itemBuilders);
+	
+	
+	/**
+	 * This operation retrieves all of the CompositeItemBuilders from the
+	 * ExtensionRegistry.
+	 *
+	 * @return The array of CompositeItemBuilders that were found in the registry.
+	 * @throws CoreException
+	 *             This exception is thrown if an extension cannot be loaded.
+	 */
+	public static ICompositeItemBuilder[] getCompositeItemBuilders() throws CoreException {
+
+		/**
+		 * Logger for handling event messages and other information.
+		 */
+		Logger logger = LoggerFactory.getLogger(ICompositeItemBuilder.class);
+
+		ICompositeItemBuilder[] builders = null;
+		
+		IExtensionPoint point = Platform.getExtensionRegistry()
+				.getExtensionPoint(EXTENSION_ID);
+
+		// If the point is available, create all the builders and load them into
+		// the array.
+		if (point != null) {
+			IConfigurationElement[] elements = point.getConfigurationElements();
+			builders = new ICompositeItemBuilder[elements.length];
+			for (int i = 0; i < elements.length; i++) {
+				builders[i] = (ICompositeItemBuilder) elements[i]
+						.createExecutableExtension("class");
+			}
+		} else {
+			logger.error("Extension Point " + EXTENSION_ID + "does not exist");
+		}
+
+		return builders;
+	}
 }
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