1 files changed, 97 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/DescendingImmutableSortedMultiset.java b/guava/src/com/google/common/collect/DescendingImmutableSortedMultiset.java
new file mode 100644
index 0000000..d2d0088
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+++ b/guava/src/com/google/common/collect/DescendingImmutableSortedMultiset.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2011 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 javax.annotation.Nullable;
+
+/**
+ * A descending wrapper around an {@code ImmutableSortedMultiset}
+ *
+ * @author Louis Wasserman
+ */
+@SuppressWarnings("serial") // uses writeReplace, not default serialization
+final class DescendingImmutableSortedMultiset<E> extends ImmutableSortedMultiset<E> {
+  private final transient ImmutableSortedMultiset<E> forward;
+
+  DescendingImmutableSortedMultiset(ImmutableSortedMultiset<E> forward) {
+    this.forward = forward;
+  }
+
+  @Override
+  public int count(@Nullable Object element) {
+    return forward.count(element);
+  }
+
+  @Override
+  public Entry<E> firstEntry() {
+    return forward.lastEntry();
+  }
+
+  @Override
+  public Entry<E> lastEntry() {
+    return forward.firstEntry();
+  }
+
+  @Override
+  public int size() {
+    return forward.size();
+  }
+
+  @Override
+  public ImmutableSortedSet<E> elementSet() {
+    return forward.elementSet().descendingSet();
+  }
+
+  @Override
+  ImmutableSet<Entry<E>> createEntrySet() {
+    final ImmutableSet<Entry<E>> forwardEntrySet = forward.entrySet();
+    return new EntrySet() {
+      @Override
+      public int size() {
+        return forwardEntrySet.size();
+      }
+
+      @Override
+      public UnmodifiableIterator<Entry<E>> iterator() {
+        return asList().iterator();
+      }
+
+      @Override
+      ImmutableList<Entry<E>> createAsList() {
+        return forwardEntrySet.asList().reverse();
+      }
+    };
+  }
+
+  @Override
+  public ImmutableSortedMultiset<E> descendingMultiset() {
+    return forward;
+  }
+
+  @Override
+  public ImmutableSortedMultiset<E> headMultiset(E upperBound, BoundType boundType) {
+    return forward.tailMultiset(upperBound, boundType).descendingMultiset();
+  }
+
+  @Override
+  public ImmutableSortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) {
+    return forward.headMultiset(lowerBound, boundType).descendingMultiset();
+  }
+
+  @Override
+  boolean isPartialView() {
+    return forward.isPartialView();
+  }
+}