60 lines
2.4 KiB
Java
60 lines
2.4 KiB
Java
package nodomain.freeyourgadget.gadgetbridge.util;
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import java.util.Collection;
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public class ArrayUtils {
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/**
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* Checks the two given arrays for equality, but comparing only a subset of the second
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* array with the whole first array.
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*
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* @param first the whole array to compare against
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* @param second the array, of which a subset shall be compared against the whole first array
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* @param secondStartIndex the start index (inclusive) of the second array from which to start the comparison
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* @param secondEndIndex the end index (exclusive) of the second array until which to compare
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* @return whether the first byte array is equal to the specified subset of the second byte array
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* @throws IllegalArgumentException when one of the arrays is null or start and end index are wrong
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*/
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public static boolean equals(byte[] first, byte[] second, int secondStartIndex, int secondEndIndex) {
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if (first == null) {
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throw new IllegalArgumentException("first must not be null");
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}
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if (second == null) {
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throw new IllegalArgumentException("second must not be null");
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}
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if (secondStartIndex >= secondEndIndex) {
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throw new IllegalArgumentException("secondStartIndex must be smaller than secondEndIndex");
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}
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if (second.length < secondEndIndex) {
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throw new IllegalArgumentException("secondStartIndex must be smaller than secondEndIndex");
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}
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int len = secondEndIndex - secondStartIndex;
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if (first.length != len) {
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return false;
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}
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for (int i = 0; i < len; i++) {
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if (first[i] != second[secondStartIndex + i]) {
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return false;
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}
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}
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return true;
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}
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/**
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* Converts a collection of Integer values to an int[] array.
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* @param values
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* @return null if the given collection is null, otherwise an array of the same size as the collection
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* @throws NullPointerException when an element of the collection is null
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*/
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public static int[] toIntArray(Collection<Integer> values) {
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if (values == null) {
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return null;
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}
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int i = 0;
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int[] result = new int[values.size()];
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for (Integer value : values) {
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result[i++] = value;
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}
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return result;
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}
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}
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