1 files changed, 112 insertions, 0 deletions
diff --git a/jsf/plugins/org.eclipse.jst.jsf.facelet.core/src/org/eclipse/jst/jsf/facelet/core/internal/registry/taglib/Listener.java b/jsf/plugins/org.eclipse.jst.jsf.facelet.core/src/org/eclipse/jst/jsf/facelet/core/internal/registry/taglib/Listener.java
new file mode 100644
index 000000000..07de09aef
--- /dev/null
+++ b/jsf/plugins/org.eclipse.jst.jsf.facelet.core/src/org/eclipse/jst/jsf/facelet/core/internal/registry/taglib/Listener.java
@@ -0,0 +1,112 @@
+package org.eclipse.jst.jsf.facelet.core.internal.registry.taglib;
+
+import org.eclipse.jst.jsf.common.internal.locator.ILocatorChangeListener;
+
+/**
+ * A listener for locator detected tag library changes
+ * @author cbateman
+ *
+ */
+public abstract class Listener implements ILocatorChangeListener
+{
+    /**
+     * Indicates that a tag library has changed
+     * @author cbateman
+     *
+     */
+    public static class TaglibChangedEvent extends LocatorChangeEvent
+    {
+        /**
+         * TODO: what happens if one locator has a namespace collision with
+         * another one?
+         */
+        public enum CHANGE_TYPE
+        {
+            /**
+             * Indicates that the library is new
+             */
+            ADDED, 
+            
+            /**
+             * Indicates that the library was removed.
+             */
+            REMOVED, 
+            
+            /**
+             * Indicates that the library is not new, but it's content
+             * has changed
+             */
+            CHANGED
+        }
+
+        private final TaglibChangedEvent.CHANGE_TYPE       _changeType;
+        private final IFaceletTagRecord _oldValue;
+        private final IFaceletTagRecord _newValue;
+
+        /**
+         * @param source
+         * @param oldValue 
+         * @param newValue 
+         * @param changeType
+         */
+        public TaglibChangedEvent(
+                final AbstractFaceletTaglibLocator source,
+                final IFaceletTagRecord oldValue, 
+                final IFaceletTagRecord newValue,
+                TaglibChangedEvent.CHANGE_TYPE changeType)
+        {
+            super(source);
+            _changeType = changeType;
+            _oldValue = oldValue;
+            _newValue = newValue;
+        }
+
+        /**
+         * 
+         */
+        private static final long serialVersionUID = -4060018031568577836L;
+
+        @Override
+        public AbstractFaceletTaglibLocator getSource()
+        {
+            return (AbstractFaceletTaglibLocator) super.getSource();
+        }
+
+        /**
+         * @return the type of the change
+         */
+        public final TaglibChangedEvent.CHANGE_TYPE getChangeType()
+        {
+            return _changeType;
+        }
+
+        /**
+         * @return the old value. This is null if the event is ADDED
+         */
+        public final IFaceletTagRecord getOldValue()
+        {
+            return _oldValue;
+        }
+        
+        /**
+         * @return the new value.  This is null if the event is REMOVED
+         */
+        public final IFaceletTagRecord getNewValue()
+        {
+            return _newValue;
+        }
+    }
+
+ 
+    public final void changed(final LocatorChangeEvent event)
+    {
+        changed((TaglibChangedEvent)event);
+    }
+
+
+    /**
+     * @param event 
+     * 
+     */
+    public abstract void changed(Listener.TaglibChangedEvent event);
+}
+\ No newline at end of file