Dissolve gerrit-server top-level directory

Change-Id: I538512dfe0f1bea774c01fdd45fa410a45634011

java/com/google/gerrit/server/plugins/DelegatingClassLoader.java

@@ -0,0 +1,71 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed 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 com.google.gerrit.server.plugins;
+
+import com.google.common.io.ByteStreams;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Enumeration;
+
+public class DelegatingClassLoader extends ClassLoader {
+  private final ClassLoader target;
+
+  public DelegatingClassLoader(ClassLoader parent, ClassLoader target) {
+    super(parent);
+    this.target = target;
+  }
+
+  @Override
+  public Class<?> findClass(String name) throws ClassNotFoundException {
+    String path = name.replace('.', '/') + ".class";
+    InputStream resource = target.getResourceAsStream(path);
+    if (resource != null) {
+      try {
+        byte[] bytes = ByteStreams.toByteArray(resource);
+        return defineClass(name, bytes, 0, bytes.length);
+      } catch (IOException e) {
+      }
+    }
+    throw new ClassNotFoundException(name);
+  }
+
+  @Override
+  public URL getResource(String name) {
+    URL rtn = getParent().getResource(name);
+    if (rtn == null) {
+      rtn = target.getResource(name);
+    }
+    return rtn;
+  }
+
+  @Override
+  public Enumeration<URL> getResources(String name) throws IOException {
+    Enumeration<URL> rtn = getParent().getResources(name);
+    if (rtn == null) {
+      rtn = target.getResources(name);
+    }
+    return rtn;
+  }
+
+  @Override
+  public InputStream getResourceAsStream(String name) {
+    InputStream rtn = getParent().getResourceAsStream(name);
+    if (rtn == null) {
+      rtn = target.getResourceAsStream(name);
+    }
+    return rtn;
+  }
+}