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From ff...@apache.org
Subject svn commit: r1621938 - /servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java
Date Tue, 02 Sep 2014 07:14:31 GMT
Author: ffang
Date: Tue Sep  2 07:14:30 2014
New Revision: 1621938

URL: http://svn.apache.org/r1621938
Log:
[SMX4-1815]add TCCL as fallback classloader for xalan ExtensionHandler

Added:
    servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java

Added: servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java
URL: http://svn.apache.org/viewvc/servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java?rev=1621938&view=auto
==============================================================================
--- servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java
(added)
+++ servicemix/smx4/bundles/trunk/xalan-2.7.1/src/main/java/org/apache/xalan/extensions/ExtensionHandler.java
Tue Sep  2 07:14:30 2014
@@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the  "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+/*
+ * $Id: ExtensionHandler.java 468637 2006-10-28 06:51:02Z minchau $
+ */
+package org.apache.xalan.extensions;
+
+import java.io.IOException;
+import java.util.Vector;
+
+import javax.xml.transform.TransformerException;
+
+import org.apache.xalan.templates.ElemTemplateElement;
+import org.apache.xalan.templates.Stylesheet;
+import org.apache.xalan.transformer.TransformerImpl;
+import org.apache.xpath.functions.FuncExtFunction;
+
+/**
+ * Abstract base class for handling an extension namespace for XPath.
+ * Provides functions to test a function's existence and call a function.
+ * Also provides functions for calling an element and testing for
+ * an element's existence.
+ *
+ * @author Sanjiva Weerawarana (sanjiva@watson.ibm.com)
+ * @xsl.usage internal
+ */
+public abstract class ExtensionHandler
+{
+
+  /** uri of the extension namespace */
+  protected String m_namespaceUri; 
+
+  /** scripting language of implementation */
+  protected String m_scriptLang;
+
+  /**
+   * This method loads a class using the context class loader if we're
+   * running under Java2 or higher.
+   * 
+   * @param className Name of the class to load
+   */
+  static Class getClassForName(String className)
+      throws ClassNotFoundException
+  {
+    // Hack for backwards compatibility with XalanJ1 stylesheets
+    if(className.equals("org.apache.xalan.xslt.extensions.Redirect")) {
+      className = "org.apache.xalan.lib.Redirect";
+    }
+    
+    try {
+
+        return ObjectFactory.findProviderClass(
+                   className, ObjectFactory.findClassLoader(), true);
+    } catch (ClassNotFoundException cnfe) {
+        //add TCCL as fallback
+        return ObjectFactory.findProviderClass(
+                   className, Thread.currentThread().getContextClassLoader(), true);
+    }
+  }
+
+  /**
+   * Construct a new extension namespace handler given all the information
+   * needed.
+   *
+   * @param namespaceUri the extension namespace URI that I'm implementing
+   * @param scriptLang   language of code implementing the extension
+   */
+  protected ExtensionHandler(String namespaceUri, String scriptLang)
+  {
+    m_namespaceUri = namespaceUri;
+    m_scriptLang = scriptLang;
+  }
+
+  /**
+   * Tests whether a certain function name is known within this namespace.
+   * @param function name of the function being tested
+   * @return true if its known, false if not.
+   */
+  public abstract boolean isFunctionAvailable(String function);
+
+  /**
+   * Tests whether a certain element name is known within this namespace.
+   * @param element Name of element to check
+   * @return true if its known, false if not.
+   */
+  public abstract boolean isElementAvailable(String element);
+
+  /**
+   * Process a call to a function.
+   *
+   * @param funcName Function name.
+   * @param args     The arguments of the function call.
+   * @param methodKey A key that uniquely identifies this class and method call.
+   * @param exprContext The context in which this expression is being executed.
+   *
+   * @return the return value of the function evaluation.
+   *
+   * @throws TransformerException          if parsing trouble
+   */
+  public abstract Object callFunction(
+    String funcName, Vector args, Object methodKey,
+      ExpressionContext exprContext) throws TransformerException;
+
+  /**
+   * Process a call to a function.
+   *
+   * @param extFunction The XPath extension function.
+   * @param args     The arguments of the function call.
+   * @param exprContext The context in which this expression is being executed.
+   *
+   * @return the return value of the function evaluation.
+   *
+   * @throws TransformerException          if parsing trouble
+   */
+  public abstract Object callFunction(
+    FuncExtFunction extFunction, Vector args,
+      ExpressionContext exprContext) throws TransformerException;
+
+  /**
+   * Process a call to this extension namespace via an element. As a side
+   * effect, the results are sent to the TransformerImpl's result tree.
+   *
+   * @param localPart      Element name's local part.
+   * @param element        The extension element being processed.
+   * @param transformer    Handle to TransformerImpl.
+   * @param stylesheetTree The compiled stylesheet tree.
+   * @param methodKey      A key that uniquely identifies this class and method call.
+   *
+   * @throws XSLProcessorException thrown if something goes wrong
+   *            while running the extension handler.
+   * @throws MalformedURLException if loading trouble
+   * @throws FileNotFoundException if loading trouble
+   * @throws IOException           if loading trouble
+   * @throws TransformerException  if parsing trouble
+   */
+  public abstract void processElement(
+    String localPart, ElemTemplateElement element, TransformerImpl transformer,
+      Stylesheet stylesheetTree, Object methodKey) throws TransformerException, IOException;
+}



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