Literal.java

/* Copyright 2005-2006 Tim Fennell
 *
 * 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 net.sourceforge.stripes.util;

import java.util.List;
import java.util.Collections;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.SortedSet;
import java.util.TreeSet;

/**
 * Utility class that makes it easy to construct Collection literals, and also provides
 * a nicer syntax for creating array literals.
 *
 * @author Tim Fennell
 * @since Stripes 1.1.2
 */
public class Literal {

    /** Returns an array containing all the elements supplied. */
    public static <T> T[] array(T... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static boolean[] array(boolean... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static byte[] array(byte... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static char[] array(char... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static short[] array(short... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static int[] array(int... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static long[] array(long... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static float[] array(float... elements) { return elements; }

    /** Returns an array containing all the elements supplied. */
    public static double[] array(double... elements) { return elements; }

    /** Returns a new List instance containing the supplied elements. */
    public static <T> List<T> list(T... elements) {
        List<T> list = new ArrayList<T>();
        Collections.addAll(list, elements);
        return list;
    }

    /** Returns a new Set instance containing the supplied elements. */
    public static <T> Set<T> set(T... elements) {
        Set<T> set = new HashSet<T>();
        Collections.addAll(set, elements);
        return set;
    }

    /** Returns a new SortedSet instance containing the supplied elements. */
    public static <T extends Comparable<?>> SortedSet<T> sortedSet(T... elements) {
        SortedSet<T> set = new TreeSet<T>();
        Collections.addAll(set, elements);
        return set;
    }
}