Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2009 Stephan Schloepke and innoQ Deutschland GmbH
 *
 * Stephan Schloepke: http://www.schloepke.de/
 * innoQ Deutschland GmbH: http://www.innoq.com/
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.util.ArrayList;

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;

import java.util.List;
import java.util.Map;
import java.util.Set;

public class Main {
    /**
     * Creates an unmodifiable shallow copy of the given original {@link Map}. <p> While the copy returns an immutable
     * copy of the {@link Map} the content is not cloned in any way. Unless the content is immutable by itself the
     * result is not fully immutable. In the shallow copy all references are the same as in the original {@link Map}!
     * </p>
     *
     * @param original The {@link Map} to copy the elements fro.
     * @param <K>      The type of the key
     * @param <V>      The type of the value
     *
     * @return Returns an immutable (unmodifiable) copy of the original {@link Map} with all the elements added but not
     * cloned!
     */
    public static <K, V> Map<K, V> createUnmodifiableShallowCopy(final Map<K, V> original) {
        if (original == null || original.isEmpty()) {
            return Collections.emptyMap();
        } else {
            return Collections.unmodifiableMap(new HashMap<K, V>(original));
        }
    }

    /**
     * Creates an unmodifiable shallow copy of the given original {@link Set}. <p> While the copy returns an immutable
     * copy of the {@link Set} the content is not cloned in any way. Unless the content is immutable by itself the
     * result is not fully immutable. In the shallow copy all references are the same as in the original {@link Set}!
     * </p>
     *
     * @param original The {@link Set} to copy the elements fro.
     * @param <E>      The type of the elements
     *
     * @return Returns an immutable (unmodifiable) copy of the original {@link Set} with all the elements added but not
     * cloned!
     */
    public static <E> Set<E> createUnmodifiableShallowCopy(final Set<E> original) {
        if (original == null || original.isEmpty()) {
            return Collections.emptySet();
        } else {
            return Collections.unmodifiableSet(new HashSet<E>(original));
        }
    }

    /**
     * Creates an unmodifiable shallow copy of the given original {@link List}. <p> While the copy returns an immutable
     * copy of the {@link List} the content is not cloned in any way. Unless the content is immutable by itself the
     * result is not fully immutable. In the shallow copy all references are the same as in the original {@link List}!
     * </p>
     *
     * @param original The {@link List} to copy the elements fro.
     * @param <E>      The type of the elements
     *
     * @return Returns an immutable (unmodifiable) copy of the original {@link List} with all the elements added but not
     * cloned!
     */
    public static <E> List<E> createUnmodifiableShallowCopy(final List<E> original) {
        if (original == null || original.isEmpty()) {
            return Collections.emptyList();
        } else {
            return Collections.unmodifiableList(new ArrayList<E>(original));
        }
    }
}