jflowmap.util.ArrayUtils.java Source code

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Here is the source code for jflowmap.util.ArrayUtils.java

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/*
 * This file is part of JFlowMap.
 *
 * Copyright 2009 Ilya Boyandin
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jflowmap.util;

import java.util.Collection;

import com.google.common.collect.ImmutableList;
import com.google.common.primitives.Doubles;

/**
 * @author Ilya Boyandin
 */
public class ArrayUtils {

    private ArrayUtils() {
    }

    /**
     * NOTE: This method modifies the input array
     */
    public static int[] reverse(int[] a) {
        for (int left = 0, right = a.length - 1; left < right; left++, right--) {
            // exchange the first and last
            int _ = a[left];
            a[left] = a[right];
            a[right] = _;
        }
        return a;
    }

    /**
     * NOTE: This method modifies the input array
     */
    public static <T> T[] reverse(T[] a) {
        for (int left = 0, right = a.length - 1; left < right; left++, right--) {
            // exchange the first and last
            T _ = a[left];
            a[left] = a[right];
            a[right] = _;
        }
        return a;
    }

    public static double[] toArrayOfPrimitives(Iterable<Double> data) {
        if (data instanceof Collection) {
            return Doubles.toArray((Collection<Double>) data);
        } else {
            return Doubles.toArray(ImmutableList.copyOf(data));
        }
    }

}