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Guava-inspired set of utilities for LibGDX.
There is a newer version: 1.9.1.9.6
package com.github.czyzby.kiwi.util.tuple;

import java.io.Serializable;
import java.util.Iterator;

/** Interface shared by all tuples. Ensures that they are serializable.
 *
 * @author MJ */
public interface Tuple extends Serializable {
    int INVALID_INDEX = -1;
    String COMMA_WITH_SPACE_SEPARATOR = ", ";

    /** @param index index of the variable in pair.
     * @return variable in pair with the passed index.
     * @throws IndexOutOfBoundsException for invalid index. */
    public Object get(int index) throws IndexOutOfBoundsException;

    /** @param index index of the variable in pair.
     * @param asInstanceOf expected type of value.
     * @return variable in pair with the passed index.
     * @throws IndexOutOfBoundsException for invalid index.
     * @throws ClassCastException if value's class doesn't match with the passed class parameter.
     * @param  stored value type. */
    public  Type get(int index, Class asInstanceOf) throws IndexOutOfBoundsException;

    /** @return current size of the tuple. */
    public int getSize();

    /** @param value might be in the tuple.
     * @return true if the value is stored in the tuple. Uses equals method. If the value is null, will return true if
     *         any of the values are null. */
    public boolean contains(Object value);

    /** @param values might be in the tuple.
     * @return true if all values are stored in the tuple. */
    public boolean containsAll(Object... values);

    /** @param values might be in the tuple.
     * @return true if all values are stored in the tuple. */
    public boolean containsAll(Iterable values);

    /** @param values might be in the tuple.
     * @return true if any of the values is stored in the tuple. */
    public boolean containsAny(Object... values);

    /** @param values might be in the tuple.
     * @return true if any of the values is stored in the tuple. */
    public boolean containsAny(Iterable values);

    /** @param value might be in the tuple.
     * @return index of the passed value in the tuple or -1 if value is absent. If value is stored in the tuple multiple
     *         times, only the first index will be returned. Accepts null; returns the first index of null value in the
     *         tuple or -1 if all values are not null. */
    public int indexOf(Object value);

    /** @return tuple values stored in a new array. */
    public Object[] toArray();

    /** @param array will be filled.
     * @return tuple values stored in the passed array.
     * @param  type of array. */
    public  Type[] toArray(Type[] array);

    /** @return false if tuple cannot be mutated. */
    public boolean isMutable();

    /** @param index value will be inserted at this position.
     * @param value will be set as the value with the given index. Might be unsupported if tuple is not mutable. */
    public void set(int index, Object value);

    /** @param forClass common type of stored values.
     * @return a typed operator returning values of the selected class. Iteration might throws ClassCastExceptions if
     *         pair contains other types of objects than selected.
     * @param  type of iterator. */
    public  Iterator iterator(Class forClass);
}