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diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/FSLockFactory.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/FSLockFactory.java
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+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 java.io.File;
+
+/**
+ * Base class for file system based locking implementation.
+ */
+
+public abstract class FSLockFactory extends LockFactory {
+
+  /**
+   * Directory for the lock files.
+   */
+  protected File lockDir = null;
+
+  /**
+   * Set the lock directory. This method can be only called
+   * once to initialize the lock directory. It is used by {@link FSDirectory}
+   * to set the lock directory to itself.
+   * Subclasses can also use this method to set the directory
+   * in the constructor.
+   */
+  protected final void setLockDir(File lockDir) {
+    if (this.lockDir != null)
+      throw new IllegalStateException("You can set the lock directory for this factory only once.");
+    this.lockDir = lockDir;
+  }
+  
+  /**
+   * Retrieve the lock directory.
+   */
+  public File getLockDir() {
+    return lockDir;
+  }
+
+}