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/*

 * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI

 * for visualizing and manipulating spatial features with geometry and attributes.

 *

 * Copyright (C) 2003 Vivid Solutions

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

 *

 * For more information, contact:

 *

 * Vivid Solutions

 * Suite #1A

 * 2328 Government Street

 * Victoria BC  V8T 5G5

 * Canada

 *

 * (250)385-6040

 * www.vividsolutions.com

 */

package com.vividsolutions.jump.util;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

import com.vividsolutions.jts.util.Assert;

/**

 * Utilities to support the Java language.

 */

public class LangUtil {

    private static Map primitiveToWrapperMap = new HashMap() {

        {

            put(byte.class, Byte.class);

            put(char.class, Character.class);

            put(short.class, Short.class);

            put(int.class, Integer.class);

            put(long.class, Long.class);

            put(float.class, Float.class);

            put(double.class, Double.class);

            put(boolean.class, Boolean.class);

        }

    };

    public static String emptyStringIfNull(String s) {

        return (s == null) ? "" : s;

    }

    /**

     * Useful because an expression used to generate o need only be

     * evaluated once.

     */

    public static Object ifNull(Object o, Object alternative) {

        return (o == null) ? alternative : o;

    }

    public static Object ifNotNull(Object o, Object alternative) {

        return (o != null) ? alternative : o;

    }

    public static Class toPrimitiveWrapperClass(Class primitiveClass) {

        return (Class) primitiveToWrapperMap.get(primitiveClass);

    }

    public static boolean isPrimitive(Class c) {

        return primitiveToWrapperMap.containsKey(c);

    }

    public static boolean bothNullOrEqual(Object a, Object b) {

        return (a == null && b == null) || (a != null && b != null && a.equals(b));

    }

    public static Object newInstance(Class c) {

        try {

            return c.newInstance();

        } catch (Exception e) {

            Assert.shouldNeverReachHere(e.toString());

            return null;

        }

    }

    public static Collection classesAndInterfaces(Class c) {

        ArrayList classesAndInterfaces = new ArrayList();

        classesAndInterfaces.add(c);

        superclasses(c, classesAndInterfaces);

        classesAndInterfaces.addAll(Arrays.asList(c.getInterfaces()));

        return classesAndInterfaces;

    }

    private static void superclasses(Class c, Collection results) {

        if (c.getSuperclass() == null) {

            return;

        }

        results.add(c.getSuperclass());

        superclasses(c.getSuperclass(), results);

    }

}