/* Copyright (c) 2009 Google Inc.
*
* 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.wave.api.impl;
import java.util.Arrays;
/**
* An immutable tuple of values that can be accessed using {@link #get} method.
*
* @author mprasetya@google.com (Marcel Prasetya)
* @param <A> Type of the tuple element.
*/
public class Tuple<A> {
/**
* The elements of the tuple.
*/
private final A[] elements;
/**
* Factory method to create a tuple.
*
* @param <A> Type of the tuple element.
* @param elements The elements of the tuple
* @return A new tuple that contains {@code elements}
*/
public static <A> Tuple<A> of(A ... elements) {
return new Tuple<A>(elements);
}
/**
* Constructor.
*
* @param elements The elements of the tuple.
*/
public Tuple(A ... elements) {
this.elements = elements;
}
/**
* Returns the {@code index}th element of the tuple.
*
* @param index The index of the element.
* @return The {@code index}th element of the tuple.
*/
public A get(int index) {
return elements[index];
}
/**
* Returns the number of elements in the tuple.
*
* @return the number of elements in the tuple.
*/
public int size() {
return elements.length;
}
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || o.getClass() != this.getClass()) {
return false;
}
Tuple<A> o2 = (Tuple<A>) o;
return Arrays.equals(elements, o2.elements);
}
@Override
public int hashCode() {
return Arrays.hashCode(elements);
}
@Override
public String toString() {
return Arrays.toString(elements);
}
}