https://issues.apache.org/jira/browse/EXTSCRIPT-157 eliminating the scanner classloader
git-svn-id: https://svn.apache.org/repos/asf/myfaces/extensions/scripting/trunk@1302410 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/core/engine/dependencyScan/loaders/ScannerClassloader.java b/extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/core/engine/dependencyScan/loaders/ScannerClassloader.java
new file mode 100644
index 0000000..0246ecb
--- /dev/null
+++ b/extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/core/engine/dependencyScan/loaders/ScannerClassloader.java
@@ -0,0 +1,144 @@
+/*
+ * 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.
+ */
+
+package org.apache.myfaces.extensions.scripting.core.engine.dependencyScan.loaders;
+
+import org.apache.myfaces.extensions.scripting.core.common.util.ClassUtils;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * @author Werner Punz (latest modification by $Author$)
+ * @version $Revision$ $Date$
+ *
+ * TODO replace it with the ThrowAwayLoader
+ */
+@Deprecated
+public class ScannerClassloader extends ClassLoader
+{
+
+ File _tempDir = null;
+
+ Map<String, Class> _alreadyScanned = new HashMap<String, Class>();
+
+ final Logger _logger = Logger.getLogger(ScannerClassloader.class.getName());
+
+ public ScannerClassloader(ClassLoader classLoader, int scriptingEngine, String engineExtension, File tempDir)
+ {
+ super(classLoader);
+
+ this._tempDir = tempDir;
+ }
+
+ @Override
+ public InputStream getResourceAsStream(String name)
+ {
+ File resource = new File(_tempDir.getAbsolutePath() + File.separator + name);
+ if (resource.exists())
+ {
+ try
+ {
+ return new FileInputStream(resource);
+ }
+ catch (FileNotFoundException e)
+ {
+ return super.getResourceAsStream(name);
+ }
+ }
+ return super.getResourceAsStream(name);
+ }
+
+ public File getClassFile(String className)
+ {
+ return ClassUtils.classNameToFile(_tempDir.getAbsolutePath(), className);
+ }
+
+ @Override
+ public Class<?> loadClass(String className) throws ClassNotFoundException
+ {
+ //check if our class exists in the tempDir
+
+ if (_alreadyScanned.containsKey(className))
+ {
+ return _alreadyScanned.get(className);
+ }
+
+ File target = getClassFile(className);
+ if (!target.exists())
+ {
+ return super.loadClass(className);
+ }
+
+ //ClassResource data = WeavingContext.getFileChangedDaemon().getClassMap().get(className);
+ //if (data != null && !data.getRefreshAttribute().requiresRefresh()) {
+ // return data.getAClass();
+ //}
+
+ FileInputStream iStream = null;
+
+ int fileLength;
+ byte[] fileContent;
+ try
+ {
+ fileLength = (int) target.length();
+ fileContent = new byte[fileLength];
+ iStream = new FileInputStream(target);
+ int len = iStream.read(fileContent);
+ if (_logger.isLoggable(Level.FINER))
+ {
+ _logger.log(Level.FINER, "class read {0} bytes read", String.valueOf(len));
+ }
+ //we have to do it here because just in case
+ //a dependent class is loaded as well we run into classcast exceptions
+ Class retVal = super.defineClass(className, fileContent, 0, fileLength);
+ _alreadyScanned.put(className, retVal);
+ return retVal;
+
+ }
+ catch (FileNotFoundException e)
+ {
+ throw new ClassNotFoundException(e.toString());
+ }
+ catch (IOException e)
+ {
+ throw new ClassNotFoundException(e.toString());
+ }
+ finally
+ {
+ if (iStream != null)
+ {
+ try
+ {
+ iStream.close();
+ }
+ catch (Exception e)
+ {
+ _logger.log(Level.SEVERE, "", e);
+ }
+ }
+ }
+
+ }
+
+}
+
