Example usage for org.apache.commons.math3.exception.util LocalizedFormats START_POSITION

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LocalizedFormats START_POSITION

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From source file:org.gitools.analysis.groupcomparison.format.math33Preview.MathArrays.java

/**
 * This method is used/*from ww  w.  ja v  a2s .  c o m*/
 * to verify that the input parameters designate a subarray of positive length.
 * <p>
 * <ul>
 * <li>returns <code>true</code> iff the parameters designate a subarray of
 * non-negative length</li>
 * <li>throws <code>IllegalArgumentException</code> if the array is null or
 * or the indices are invalid</li>
 * <li>returns <code>false</li> if the array is non-null, but
 * <code>length</code> is 0 unless <code>allowEmpty</code> is <code>true</code>
 * </ul></p>
 *
 * @param values     the input array
 * @param begin      index of the first array element to include
 * @param length     the number of elements to include
 * @param allowEmpty if <code>true</code> then zero length arrays are allowed
 * @return true if the parameters are valid
 * @throws MathIllegalArgumentException if the indices are invalid or the array is null
 * @since 3.3
 */
public static boolean verifyValues(final double[] values, final int begin, final int length,
        final boolean allowEmpty) throws MathIllegalArgumentException {

    if (values == null) {
        throw new NullArgumentException(LocalizedFormats.INPUT_ARRAY);
    }

    if (begin < 0) {
        throw new NotPositiveException(LocalizedFormats.START_POSITION, Integer.valueOf(begin));
    }

    if (length < 0) {
        throw new NotPositiveException(LocalizedFormats.LENGTH, Integer.valueOf(length));
    }

    if (begin + length > values.length) {
        throw new NumberIsTooLargeException(LocalizedFormats.SUBARRAY_ENDS_AFTER_ARRAY_END,
                Integer.valueOf(begin + length), Integer.valueOf(values.length), true);
    }

    if (length == 0 && !allowEmpty) {
        return false;
    }

    return true;

}

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