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java/org/apache/jasper/compiler/JarScannerFactory.java

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+/*
+ * 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.jasper.compiler;
+
+import javax.servlet.ServletContext;
+
+import org.apache.tomcat.JarScanner;
+import org.apache.tomcat.util.scan.StandardJarScanner;
+
+/**
+ * Provide a mechanism for Jasper to obtain a reference to the JarScanner
+ * implementation.
+ */
+public class JarScannerFactory {
+
+    private JarScannerFactory() {
+        // Don't want any instances so hide the default constructor.
+    }
+
+    /**
+     * Obtain the {@link JarScanner} associated with the specified {@link
+     * ServletContext}. It is obtained via a context parameter.
+     * @param ctxt The Servlet context
+     * @return a scanner instance
+     */
+    public static JarScanner getJarScanner(ServletContext ctxt) {
+        JarScanner jarScanner =
+            (JarScanner) ctxt.getAttribute(JarScanner.class.getName());
+        if (jarScanner == null) {
+            ctxt.log(Localizer.getMessage("jsp.warning.noJarScanner"));
+            jarScanner = new StandardJarScanner();
+        }
+        return jarScanner;
+    }
+
+}