HADOOP-6150. Users should be able to instantiate comparator using TFile

API. (Hong Tang via rangadi)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20@797299 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -187,6 +187,9 @@ Release 0.20.1 - Unreleased
     MAPREDUCE-735. Fixes a problem in the KeyFieldHelper to do with 
     the end index for some inputs (Amar Kamat via ddas)
 
+    HADOOP-6150. Users should be able to instantiate comparator using TFile
+    API. (Hong Tang via rangadi)
+
 Release 0.20.0 - 2009-04-15
 
   INCOMPATIBLE CHANGES

src/core/org/apache/hadoop/io/file/tfile/TFile.java

@@ -161,6 +161,17 @@ public class TFile {
   /** comparator prefix: java class */
   public static final String COMPARATOR_JCLASS = "jclass:";
 
+  /**
+   * Make a raw comparator from a string name.
+   * 
+   * @param name
+   *          Comparator name
+   * @return A RawComparable comparator.
+   */
+  static public Comparator<RawComparable> makeComparator(String name) {
+    return TFileMeta.makeComparator(name);
+  }
+
   // Prevent the instantiation of TFiles
   private TFile() {
     // nothing
@@ -1944,7 +1955,7 @@ public class TFile {
     }
 
     @SuppressWarnings("unchecked")
-    private static BytesComparator makeComparator(String comparator) {
+    static BytesComparator makeComparator(String comparator) {
       if (comparator.length() == 0) {
         // unsorted keys
         return null;