LUCENE-976: add missing openInput(String, int) to MMapDirectory

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@564785 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/store/MMapDirectory.java

@@ -198,4 +198,8 @@ public class MMapDirectory extends FSDirectory {
       raf.close();
     }
   }
+
+  public IndexInput openInput(String name, int bufferSize) throws IOException {
+    return openInput(name);
+  }
 }

src/test/org/apache/lucene/store/TestMMapDirectory.java

@@ -0,0 +1,52 @@
+package org.apache.lucene.store;
+
+/**
+ * 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.
+ */
+
+import junit.framework.TestCase;
+import java.lang.reflect.Method;
+
+public class TestMMapDirectory extends TestCase {
+
+  // Simply verify that if there is a method in FSDirectory
+  // that returns IndexInput or a subclass, that
+  // MMapDirectory overrides it.
+  public void testIndexInputMethods() throws ClassNotFoundException  {
+    
+    Class FSDirectory = Class.forName("org.apache.lucene.store.FSDirectory");
+    Class IndexInput = Class.forName("org.apache.lucene.store.IndexInput");
+    Class MMapDirectory = Class.forName("org.apache.lucene.store.MMapDirectory");
+
+    Method[] methods = FSDirectory.getDeclaredMethods();
+    for(int i=0;i<methods.length;i++) {
+      Method method = methods[i];
+      if (IndexInput.isAssignableFrom(method.getReturnType())) {
+        // There is a method that returns IndexInput or a
+        // subclass of IndexInput
+        try {
+          Method m = MMapDirectory.getMethod(method.getName(), method.getParameterTypes());
+          if (m.getDeclaringClass() != MMapDirectory) {
+            fail("FSDirectory has method " + method + " but MMapDirectory does not override");
+          }
+        } catch (NoSuchMethodException e) {
+          // Should not happen
+          fail("unexpected NoSuchMethodException");
+        }
+      }
+    }
+  }
+}