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    • com.flowpowered.commons.LogicUtil Maven / Gradle / Ivy

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    A library for Java that provides re-usable components commonly used by Flow libraries.

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    /*
 * This file is part of Flow Commons, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2013 Flow Powered 
 *
 * 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.
 */
package com.flowpowered.commons;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

public class LogicUtil {
    /**
     * Removes duplicate values by using the objects' equals function
     Note that this function does not use a Set, because no hashcode is used.
     *
     * @param input collection
     * @return the input collection
     */
    public static > T removeDuplicates(T input) {
        List unique = new ArrayList<>(input.size());
        for (Iterator iter = input.iterator(); iter.hasNext(); ) {
            Object next = iter.next();
            if (unique.contains(next)) {
                iter.remove();
            } else {
                unique.add(next);
            }
        }
        return input;
    }

    /**
     * Checks if the object equals one of the other objects given
     *
     * @param object to check
     * @param objects to use equals against
     * @return True if one of the objects equal the object
     */
    public static  boolean equalsAny(A object, B... objects) {
        for (B o : objects) {
            if (bothNullOrEqual(o, object)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks if object a and b are both null or are equal
     *
     * @return if both null or equal
     */
    public static boolean bothNullOrEqual(Object a, Object b) {
        return (a == null || b == null) ? (a == b) : a.equals(b);
    }

    /**
     * Gets if a bit is set in an integer value
     *
     * @param value to get it of
     * @param bit to check
     * @return True if the bit is set
     */
    public static boolean getBit(int value, int bit) {
        return (value & bit) == bit;
    }

    /**
     * Sets a single bit in a byte value
     *
     * @param value to set a bit of
     * @param bit to set
     * @param state to enable or disable the bit
     * @return the resulting value
     */
    public static byte setBit(byte value, int bit, boolean state) {
        return (byte) setBit((int) value, bit, state);
    }

    /**
     * Sets a single bit in a short value
     *
     * @param value to set a bit of
     * @param bit to set
     * @param state to enable or disable the bit
     * @return the resulting value
     */
    public static short setBit(short value, int bit, boolean state) {
        return (short) setBit((int) value, bit, state);
    }

    /**
     * Sets a single bit in an integer value
     *
     * @param value to set a bit of
     * @param bit to set
     * @param state to enable or disable the bit
     * @return the resulting value
     */
    public static int setBit(int value, int bit, boolean state) {
        return state ? value | bit : value & ~bit;
    }
}
    
    
    
    

    




    
    
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