1 files changed, 66 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/AllEqualOrdering.java b/guava/src/com/google/common/collect/AllEqualOrdering.java
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+++ b/guava/src/com/google/common/collect/AllEqualOrdering.java
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+/*
+ * Copyright (C) 2012 The Guava Authors
+ *
+ * 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.google.common.collect;
+
+import com.google.common.annotations.GwtCompatible;
+
+import java.io.Serializable;
+import java.util.List;
+
+import javax.annotation.Nullable;
+
+/**
+ * An ordering that treats all references as equals, even nulls.
+ *
+ * @author Emily Soldal
+ */
+@GwtCompatible(serializable = true)
+final class AllEqualOrdering extends Ordering<Object> implements Serializable {
+  static final AllEqualOrdering INSTANCE = new AllEqualOrdering();
+
+  @Override
+  public int compare(@Nullable Object left, @Nullable Object right) {
+    return 0;
+  }
+
+  @Override
+  public <E> List<E> sortedCopy(Iterable<E> iterable) {
+    return Lists.newArrayList(iterable);
+  }
+
+  @Override
+  public <E> ImmutableList<E> immutableSortedCopy(Iterable<E> iterable) {
+    return ImmutableList.copyOf(iterable);
+  }
+
+  @SuppressWarnings("unchecked")
+  @Override
+  public <S> Ordering<S> reverse() {
+    return (Ordering<S>) this;
+  }
+
+  private Object readResolve() {
+    return INSTANCE;
+  }
+
+  @Override
+  public String toString() {
+    return "Ordering.allEqual()";
+  }
+
+  private static final long serialVersionUID = 0;
+}