Refactor of template and script services to allow easy addition of further template and script processors.

Hightlights of check-in include:
- Introduction of script processor 
- Neutralisation of script and template models
- The notion of a processor extension introduced
- Extensions applied to processor implementation rather than the services
- Auto selection of processor based on file extension of template or script

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5519 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/jscript/BaseScopableProcessorExtension.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the
+ * License.
+ */
+package org.alfresco.repo.jscript;
+
+import org.alfresco.repo.processor.BaseProcessorExtension;
+import org.mozilla.javascript.Scriptable;
+
+/**
+ * Abstract base class for a script implementation that requires a script execution scope.
+ * 
+ * The scope is local to the currently executing script and therefore a ThreadLocal is required.
+ * 
+ * @author Kevin Roast
+ */
+public class BaseScopableProcessorExtension extends BaseProcessorExtension implements Scopeable
+{
+    private static ThreadLocal<Scriptable> scope = new ThreadLocal<Scriptable>();
+    
+    /**
+     * Set the Scriptable global scope
+     * 
+     * @param script relative global scope
+     */
+    public void setScope(Scriptable scope)
+    {
+        BaseScopableProcessorExtension.scope.set(scope);
+    }
+    
+    /**
+     * @return script global scope
+     */
+    public Scriptable getScope()
+    {
+        return BaseScopableProcessorExtension.scope.get();
+    }
+}