com.qwazr.utils.ArrayUtils.java Source code

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Here is the source code for com.qwazr.utils.ArrayUtils.java

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/**
 * Copyright 2015-2016 Emmanuel Keller / QWAZR
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.qwazr.utils;

import java.util.Arrays;
import java.util.Collection;

public class ArrayUtils extends org.apache.commons.lang3.ArrayUtils {

    public static boolean startsWith(final byte[] array, final byte[] prefix) {
        if (array == null)
            return false;
        if (prefix == null)
            return false;
        if (prefix.length > array.length)
            return false;
        for (int i = 0; i < prefix.length; i++)
            if (array[i] != prefix[i])
                return false;
        return true;
    }

    public static double[] toPrimitiveDouble(Collection<Double> collection) {
        double[] array = new double[collection.size()];
        int i = 0;
        for (double val : collection)
            array[i++] = val;
        return array;
    }

    public static int[] toPrimitiveInt(Collection<Integer> collection) {
        int[] array = new int[collection.size()];
        int i = 0;
        for (int val : collection)
            array[i++] = val;
        return array;
    }

    public static long[] toPrimitiveLong(Collection<Long> collection) {
        long[] array = new long[collection.size()];
        int i = 0;
        for (long val : collection)
            array[i++] = val;
        return array;
    }

    public static float[] toPrimitiveFloat(Collection<Float> collection) {
        float[] array = new float[collection.size()];
        int i = 0;
        for (float val : collection)
            array[i++] = val;
        return array;
    }

    public static String prettyPrint(Collection<?> collection) {
        if (collection == null)
            return null;
        return Arrays.toString(collection.toArray());
    }

    public static String[] toArray(Collection<String> collection) {
        if (collection == null)
            return null;
        String[] array = new String[collection.size()];
        int i = 0;
        for (String val : collection)
            array[i++] = val;
        return array;
    }

    public static String[] toStringArray(Collection<Object> collection) {
        if (collection == null)
            return null;
        String[] array = new String[collection.size()];
        int i = 0;
        for (Object val : collection)
            array[i++] = val == null ? null : val.toString();
        return array;
    }
}