- Added public static boolean isLocked(String) method.

PR:
Obtained from:
Submitted by:	Colin Britton
Reviewed by:	otis


git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@149690 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/index/IndexReader.java

@@ -310,6 +310,16 @@ abstract public class IndexReader {
 	return directory.fileExists("write.lock");
     }
 
+  /**
+   * Returns <code>true</code> iff the index in the named directory is
+   * currently locked.
+   * @param directory the directory to check for a lock
+   * @throws IOException if there is a problem with accessing the index
+   */
+    public static boolean isLocked(String directory) throws IOException {
+	return (new File(directory, "write.lock")).exists();
+    }
+
    /**
     * Forcibly unlocks the index in the named directory.
     * <P>