Update #0 - First Release

sources/main/java/com/google/common/collect/RegularImmutableMultiset.java

@@ -0,0 +1,79 @@
+/*
+ * 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 java.util.Map;
+
+import javax.annotation.Nullable;
+
+import com.google.common.annotations.GwtCompatible;
+
+/**
+ * Implementation of {@link ImmutableMultiset} with zero or more elements.
+ *
+ * @author Jared Levy
+ * @author Louis Wasserman
+ */
+@GwtCompatible(serializable = true)
+@SuppressWarnings("serial")
+// uses writeReplace(), not default serialization
+class RegularImmutableMultiset<E> extends ImmutableMultiset<E> {
+	private final transient ImmutableMap<E, Integer> map;
+	private final transient int size;
+
+	RegularImmutableMultiset(ImmutableMap<E, Integer> map, int size) {
+		this.map = map;
+		this.size = size;
+	}
+
+	@Override
+	boolean isPartialView() {
+		return map.isPartialView();
+	}
+
+	@Override
+	public int count(@Nullable Object element) {
+		Integer value = map.get(element);
+		return (value == null) ? 0 : value;
+	}
+
+	@Override
+	public int size() {
+		return size;
+	}
+
+	@Override
+	public boolean contains(@Nullable Object element) {
+		return map.containsKey(element);
+	}
+
+	@Override
+	public ImmutableSet<E> elementSet() {
+		return map.keySet();
+	}
+
+	@Override
+	Entry<E> getEntry(int index) {
+		Map.Entry<E, Integer> mapEntry = map.entrySet().asList().get(index);
+		return Multisets.immutableEntry(mapEntry.getKey(), mapEntry.getValue());
+	}
+
+	@Override
+	public int hashCode() {
+		return map.hashCode();
+	}
+}