SetUtil.java

/*******************************************************************************
 * Copyright (c) 2006-2010 eBay Inc. All Rights Reserved.
 * 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
 *******************************************************************************/
package org.ebayopensource.turmeric.eclipse.mavenapi.internal.collections;

import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

/**
 * The Class SetUtil.
 *
 * @author James Ervin
 */
public class SetUtil {
	
	/**
	 * Tree set.
	 *
	 * @param <T> the generic type
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> treeSet(final T... objects) {
		final Set<T> list = new TreeSet<T>();
		add(list, objects);
		return list;
	}

	/**
	 * Tree set.
	 *
	 * @param <T> the generic type
	 * @param collection the collection
	 * @return the sets the
	 */
	public static <T> Set<T> treeSet(final Collection<T> collection) {
		final Set<T> list = new TreeSet<T>();
		if (collection != null && collection.size() > 0)
			list.addAll(collection);
		return list;
	}

	/**
	 * Hash set.
	 *
	 * @param <T> the generic type
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> hashSet(final T... objects) {
		final Set<T> list = new HashSet<T>();
		add(list, objects);
		return list;
	}

	/**
	 * Hash set.
	 *
	 * @param <T> the generic type
	 * @param collection the collection
	 * @return the sets the
	 */
	public static <T> Set<T> hashSet(final Collection<T> collection) {
		final Set<T> list = new HashSet<T>();
		if (collection != null && collection.size() > 0)
			list.addAll(collection);
		return list;
	}

	/**
	 * Linked set.
	 *
	 * @param <T> the generic type
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> linkedSet(final T... objects) {
		final Set<T> list = new LinkedHashSet<T>();
		add(list, objects);
		return list;
	}

	/**
	 * Linked set.
	 *
	 * @param <T> the generic type
	 * @param collection the collection
	 * @return the sets the
	 */
	public static <T> Set<T> linkedSet(final Collection<T> collection) {
		final Set<T> list = new LinkedHashSet<T>();
		if (collection != null && collection.size() > 0)
			list.addAll(collection);
		return list;
	}

	/**
	 * Sets the.
	 *
	 * @param <T> the generic type
	 * @param collection the collection
	 * @return the sets the
	 */
	public static <T> Set<T> set(final Collection<T> collection) {
		final Set<T> list = new HashSet<T>();
		if (collection != null && collection.size() > 0)
			list.addAll(collection);
		return list;
	}

	/**
	 * Sets the.
	 *
	 * @param <T> the generic type
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> set(final T... objects) {
		return hashSet(objects);
	}

	/**
	 * Adds the.
	 *
	 * @param <T> the generic type
	 * @param set the set
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> add(final Set<T> set, final T... objects) {
		if (objects == null)
			return set;
		for (final T object : objects)
			set.add(object);
		return set;
	}

	/**
	 * Sets the add.
	 *
	 * @param <T> the generic type
	 * @param set the set
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> setAdd(final Set<T> set, final T... objects) {
		return add(set, objects);
	}

	/**
	 * Removes the.
	 *
	 * @param <T> the generic type
	 * @param set the set
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> remove(final Set<T> set, final T... objects) {
		for (final T object : objects)
			set.remove(object);
		return set;
	}

	/**
	 * Sets the remove.
	 *
	 * @param <T> the generic type
	 * @param set the set
	 * @param objects the objects
	 * @return the sets the
	 */
	public static <T> Set<T> setRemove(final Set<T> set, final T... objects) {
		return remove(set, objects);
	}
}