1 files changed, 129 insertions, 0 deletions
diff --git a/platform/vcs-api/vcs-api-core/src/com/intellij/openapi/vcs/history/VcsRevisionNumber.java b/platform/vcs-api/vcs-api-core/src/com/intellij/openapi/vcs/history/VcsRevisionNumber.java
new file mode 100644
index 000000000000..9d5851da6889
--- /dev/null
+++ b/platform/vcs-api/vcs-api-core/src/com/intellij/openapi/vcs/history/VcsRevisionNumber.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed 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.
+ */
+package com.intellij.openapi.vcs.history;
+
+public interface VcsRevisionNumber extends Comparable<VcsRevisionNumber>{
+  VcsRevisionNumber NULL = new VcsRevisionNumber() {
+    @Override public String asString() {
+      return "";
+    }
+
+    @Override public int compareTo(VcsRevisionNumber vcsRevisionNumber) {
+      return 0;
+    }
+
+    @Override public String toString() {
+      return "NULL";
+    }
+  };
+
+  class Int implements VcsRevisionNumber, LongRevisionNumber {
+    private final int myValue;
+
+    public Int(int value) {
+      myValue = value;
+    }
+
+    @Override
+    public long getLongRevisionNumber() {
+      return myValue;
+    }
+
+    public String asString() {
+      return String.valueOf(myValue);
+    }
+
+    public int compareTo(VcsRevisionNumber vcsRevisionNumber) {
+      if (vcsRevisionNumber instanceof VcsRevisionNumber.Int){
+        return myValue - ((Int)vcsRevisionNumber).myValue;
+      }
+      return 0;
+    }
+
+    public boolean equals(final Object o) {
+      if (this == o) return true;
+      if (o == null || getClass() != o.getClass()) return false;
+
+      final Int anInt = (Int)o;
+
+      if (myValue != anInt.myValue) return false;
+
+      return true;
+    }
+
+    public int hashCode() {
+      return myValue;
+    }
+
+    public int getValue() {
+      return myValue;
+    }
+
+    @Override
+    public String toString() {
+      return asString();
+    }
+  }
+
+  class Long implements VcsRevisionNumber, LongRevisionNumber {
+    private final long myValue;
+
+    public Long(long value) {
+      myValue = value;
+    }
+
+    @Override
+    public long getLongRevisionNumber() {
+      return myValue;
+    }
+
+    public String asString() {
+      return String.valueOf(myValue);
+    }
+
+    public int compareTo(VcsRevisionNumber vcsRevisionNumber) {
+      if (vcsRevisionNumber instanceof VcsRevisionNumber.Long){
+        return java.lang.Long.signum(myValue - ((Long)vcsRevisionNumber).myValue);
+      }
+      return 0;
+    }
+
+    public long getLongValue() {
+      return myValue;
+    }
+
+    public boolean equals(final Object o) {
+      if (this == o) return true;
+      if (o == null || getClass() != o.getClass()) return false;
+
+      final Long aLong = (Long)o;
+
+      if (myValue != aLong.myValue) return false;
+
+      return true;
+    }
+
+    public int hashCode() {
+      return (int)(myValue ^ (myValue >>> 32));
+    }
+
+    public String toString() {
+      return asString();
+    }
+  }
+
+  String asString();
+}