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java/org/apache/tomcat/util/scan/JarFactory.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.MalformedURLException;
+import java.net.URL;
+import java.util.regex.Matcher;
+
+import org.apache.tomcat.Jar;
+import org.apache.tomcat.util.buf.UriUtil;
+
+/**
+ * Provide a mechanism to obtain objects that implement {@link Jar}.
+ */
+public class JarFactory {
+
+    private JarFactory() {
+        // Factory class. Hide public constructor.
+    }
+
+
+    public static Jar newInstance(URL url) throws IOException {
+        String urlString = url.toString();
+        if (urlString.startsWith("jar:file:")) {
+            if (urlString.endsWith("!/")) {
+                return new JarFileUrlJar(url, true);
+            } else {
+                return new JarFileUrlNestedJar(url);
+            }
+        } else if (urlString.startsWith("war:file:")) {
+            URL jarUrl = UriUtil.warToJar(url);
+            return new JarFileUrlNestedJar(jarUrl);
+        } else if (urlString.startsWith("file:")) {
+            return new JarFileUrlJar(url, false);
+        } else {
+            return new UrlJar(url);
+        }
+    }
+
+
+    public static URL getJarEntryURL(URL baseUrl, String entryName)
+            throws MalformedURLException {
+
+        String baseExternal = baseUrl.toExternalForm();
+
+        if (baseExternal.startsWith("jar")) {
+            // Assume this is pointing to a JAR file within a WAR. Java doesn't
+            // support jar:jar:file:... so switch to Tomcat's war:file:...
+            baseExternal = baseExternal.replaceFirst("^jar:", "war:");
+            baseExternal = baseExternal.replaceFirst("!/",
+                    Matcher.quoteReplacement(UriUtil.getWarSeparator()));
+        }
+
+        return new URL("jar:" + baseExternal + "!/" + entryName);
+    }
+}