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diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/LockFactory.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/LockFactory.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.IOException;
+
+/**
+ * <p>Base class for Locking implementation.  {@link Directory} uses
+ * instances of this class to implement locking.</p>
+ *
+ * <p>Note that there are some useful tools to verify that
+ * your LockFactory is working correctly: {@link
+ * VerifyingLockFactory}, {@link LockStressTest}, {@link
+ * LockVerifyServer}.</p>
+ *
+ * @see LockVerifyServer
+ * @see LockStressTest
+ * @see VerifyingLockFactory
+ */
+
+public abstract class LockFactory {
+
+  protected String lockPrefix = null;
+
+  /**
+   * Set the prefix in use for all locks created in this
+   * LockFactory.  This is normally called once, when a
+   * Directory gets this LockFactory instance.  However, you
+   * can also call this (after this instance is assigned to
+   * a Directory) to override the prefix in use.  This
+   * is helpful if you're running Lucene on machines that
+   * have different mount points for the same shared
+   * directory.
+   */
+  public void setLockPrefix(String lockPrefix) {
+    this.lockPrefix = lockPrefix;
+  }
+
+  /**
+   * Get the prefix in use for all locks created in this LockFactory.
+   */
+  public String getLockPrefix() {
+    return this.lockPrefix;
+  }
+
+  /**
+   * Return a new Lock instance identified by lockName.
+   * @param lockName name of the lock to be created.
+   */
+  public abstract Lock makeLock(String lockName);
+
+  /**
+   * Attempt to clear (forcefully unlock and remove) the
+   * specified lock.  Only call this at a time when you are
+   * certain this lock is no longer in use.
+   * @param lockName name of the lock to be cleared.
+   */
+  abstract public void clearLock(String lockName) throws IOException;
+}