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java/org/apache/tomcat/util/scan/JarFileUrlNestedJar.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.tomcat.util.scan;
+
+import java.io.IOException;
+import java.net.JarURLConnection;
+import java.net.URL;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+/**
+ * Implementation of {@link org.apache.tomcat.Jar} that is optimised for file
+ * based JAR URLs that refer to a JAR file nested inside a WAR
+ * (e.g URLs of the form jar:file: ... .war!/ ... .jar).
+ */
+public class JarFileUrlNestedJar extends AbstractInputStreamJar {
+
+    private final JarFile warFile;
+    private final JarEntry jarEntry;
+
+    public JarFileUrlNestedJar(URL url) throws IOException {
+        super(url);
+        JarURLConnection jarConn = (JarURLConnection) url.openConnection();
+        jarConn.setUseCaches(false);
+        warFile = jarConn.getJarFile();
+
+        String urlAsString = url.toString();
+        int pathStart = urlAsString.indexOf("!/") + 2;
+        String jarPath = urlAsString.substring(pathStart);
+        jarEntry = warFile.getJarEntry(jarPath);
+    }
+
+
+    @Override
+    public void close() {
+        closeStream();
+        if (warFile != null) {
+            try {
+                warFile.close();
+            } catch (IOException e) {
+                // Ignore
+            }
+        }
+    }
+
+
+    @Override
+    protected NonClosingJarInputStream createJarInputStream() throws IOException {
+        return new NonClosingJarInputStream(warFile.getInputStream(jarEntry));
+    }
+}