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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*		 
 * Copyright (C) 2002-2016 Sebastiano Vigna
 *
 * 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 it.unimi.dsi.fastutil.objects;
/**
 * An abstract class providing basic methods for functions implementing a
 * type-specific interface.
 *
 * 
 * Optional operations just throw an {@link UnsupportedOperationException}.
 * Generic versions of accessors delegate to the corresponding type-specific
 * counterparts following the interface rules (they take care of returning
 * null on a missing key).
 *
 * 

 * This class handles directly a default return value (including
 * {@linkplain #defaultReturnValue() methods to access it}). Instances of classes
 * inheriting from this class have just to return defRetValue to
 * denote lack of a key in type-specific methods. The value is serialized.
 *
 * 
 * Implementing subclasses have just to provide type-specific get()
 * , type-specific containsKey(), and size() methods.
 *
 */
public abstract class AbstractReference2ObjectFunction
		implements
			Reference2ObjectFunction,
			java.io.Serializable {
	private static final long serialVersionUID = -4940583368468432370L;
	protected AbstractReference2ObjectFunction() {
	}
	/**
	 * The default return value for get(), put() and
	 * remove().
	 */
	protected V defRetValue;
	public void defaultReturnValue(final V rv) {
		defRetValue = rv;
	}
	public V defaultReturnValue() {
		return defRetValue;
	}
	public V put(K key, V value) {
		throw new UnsupportedOperationException();
	}
	public V remove(Object key) {
		throw new UnsupportedOperationException();
	}
	public void clear() {
		throw new UnsupportedOperationException();
	}
}