Update #0 - First Release

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

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2007 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 com.google.common.annotations.VisibleForTesting;
+
+/**
+ * Implementation of {@link ImmutableSet} with two or more elements.
+ *
+ * @author Kevin Bourrillion
+ */
+@GwtCompatible(serializable = true, emulated = true)
+@SuppressWarnings("serial") // uses writeReplace(), not default serialization
+final class RegularImmutableSet<E> extends ImmutableSet<E> {
+	private final Object[] elements;
+	// the same elements in hashed positions (plus nulls)
+	@VisibleForTesting
+	final transient Object[] table;
+	// 'and' with an int to get a valid table index.
+	private final transient int mask;
+	private final transient int hashCode;
+
+	RegularImmutableSet(Object[] elements, int hashCode, Object[] table, int mask) {
+		this.elements = elements;
+		this.table = table;
+		this.mask = mask;
+		this.hashCode = hashCode;
+	}
+
+	@Override
+	public boolean contains(Object target) {
+		if (target == null) {
+			return false;
+		}
+		for (int i = Hashing.smear(target.hashCode()); true; i++) {
+			Object candidate = table[i & mask];
+			if (candidate == null) {
+				return false;
+			}
+			if (candidate.equals(target)) {
+				return true;
+			}
+		}
+	}
+
+	@Override
+	public int size() {
+		return elements.length;
+	}
+
+	@SuppressWarnings("unchecked") // all elements are E's
+	@Override
+	public UnmodifiableIterator<E> iterator() {
+		return (UnmodifiableIterator<E>) Iterators.forArray(elements);
+	}
+
+	@Override
+	int copyIntoArray(Object[] dst, int offset) {
+		System.arraycopy(elements, 0, dst, offset, elements.length);
+		return offset + elements.length;
+	}
+
+	@Override
+	ImmutableList<E> createAsList() {
+		return new RegularImmutableAsList<E>(this, elements);
+	}
+
+	@Override
+	boolean isPartialView() {
+		return false;
+	}
+
+	@Override
+	public int hashCode() {
+		return hashCode;
+	}
+
+	@Override
+	boolean isHashCodeFast() {
+		return true;
+	}
+}