com.opengamma.maths.lowlevelapi.functions.utilities.Negate.java Source code

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Here is the source code for com.opengamma.maths.lowlevelapi.functions.utilities.Negate.java

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/**
 * Copyright (C) 2011 - present by OpenGamma Inc. and the OpenGamma group of companies
 * 
 * Please see distribution for license.
 */
package com.opengamma.maths.lowlevelapi.functions.utilities;

import org.apache.commons.lang.Validate;

/**
 * Negates a vector
 * TODO: Have a discussion over whether we should also support 0-1 vectors as booleans.
 */

public class Negate {
    /**
     * Negates the boolean values in a vector in a stateless manner.
     * @param v a vector of booleans
     * @return tmp the negated representation of v
     */
    public static boolean[] stateless(boolean[] v) {
        Validate.notNull(v);
        final int len = v.length;
        boolean[] tmp = new boolean[len];
        for (int i = 0; i < len; i++) {
            if (v[i] == true) {
                tmp[i] = false;
            } else {
                tmp[i] = true;
            }
        }
        return tmp;
    }

    /**
     * Negates the boolean values in a vector, this is done in place, memory will be changed!
     * @param v a vector of booleans
     */
    public static void inPlace(boolean[] v) {
        Validate.notNull(v);
        final int len = v.length;
        for (int i = 0; i < len; i++) {
            if (v[i] == true) {
                v[i] = false;
            } else {
                v[i] = true;
            }
        }
    }
}