make/jdk/src/classes/build/tools/tzdb/TzdbZoneRulesCompiler.java

rev 51769 : imported patch 8209880

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -63,21 +63,20 @@
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.text.ParsePosition;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.Scanner;
 import java.util.SortedMap;
 import java.util.TreeMap;
 import java.util.regex.Matcher;
 import java.util.regex.MatchResult;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 /**
  * A compiler that reads a set of TZDB time-zone files and builds a single
  * combined TZDB data file.
  *

@@ -254,12 +253,14 @@
             String[] regionArray = builtZones.keySet().toArray(new String[builtZones.size()]);
             out.writeShort(regionArray.length);
             for (String regionId : regionArray) {
                 out.writeUTF(regionId);
             }
-            // rules  -- hashset -> remove the dup
-            List<ZoneRules> rulesList = new ArrayList<>(new HashSet<>(builtZones.values()));
+            // rules  -- remove the dup
+            List<ZoneRules> rulesList = builtZones.values().stream()
+                .distinct()
+                .collect(Collectors.toList());
             out.writeShort(rulesList.size());
             ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
             for (ZoneRules rules : rulesList) {
                 baos.reset();
                 DataOutputStream dataos = new DataOutputStream(baos);