Java 5 is already eol. Anybody still using it is certainly in maintenance mode thus adding now a feature that is available in java 6 does not make any sense. On 20 Jun 2014 15:38, <er...@apache.org> wrote:
> Author: erans > Date: Fri Jun 20 13:37:42 2014 > New Revision: 1604172 > > URL: http://svn.apache.org/r1604172 > Log: > MATH-1130 > Method "copyOfRange" (available as of Java 6 in "java.util.Arrays"). > > Modified: > > commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/MathArrays.java > > commons/proper/math/trunk/src/test/java/org/apache/commons/math3/util/MathArraysTest.java > > Modified: > commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/MathArrays.java > URL: > http://svn.apache.org/viewvc/commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/MathArrays.java?rev=1604172&r1=1604171&r2=1604172&view=diff > > ============================================================================== > --- > commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/MathArrays.java > (original) > +++ > commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/MathArrays.java > Fri Jun 20 13:37:42 2014 > @@ -799,6 +799,21 @@ public class MathArrays { > } > > /** > + * Creates a copy of the {@code source} array. > + * > + * @param source Array to be copied. > + * @param from Initial index of the range to be copied, inclusive. > + * @param to Final index of the range to be copied, exclusive. (This > index may lie outside the array.) > + * @return the copied array. > + */ > + public static double[] copyOfRange(double[] source, int from, int to) > { > + final int len = to - from; > + final double[] output = new double[len]; > + System.arraycopy(source, from, output, 0, FastMath.min(len, > source.length - from)); > + return output; > + } > + > + /** > * Compute a linear combination accurately. > * This method computes the sum of the products > * <code>a<sub>i</sub> b<sub>i</sub></code> to high accuracy. > > Modified: > commons/proper/math/trunk/src/test/java/org/apache/commons/math3/util/MathArraysTest.java > URL: > http://svn.apache.org/viewvc/commons/proper/math/trunk/src/test/java/org/apache/commons/math3/util/MathArraysTest.java?rev=1604172&r1=1604171&r2=1604172&view=diff > > ============================================================================== > --- > commons/proper/math/trunk/src/test/java/org/apache/commons/math3/util/MathArraysTest.java > (original) > +++ > commons/proper/math/trunk/src/test/java/org/apache/commons/math3/util/MathArraysTest.java > Fri Jun 20 13:37:42 2014 > @@ -588,6 +588,29 @@ public class MathArraysTest { > } > } > > + @Test > + public void testCopyOfRange() { > + final double[] source = { Double.NEGATIVE_INFINITY, > + -Double.MAX_VALUE, > + -1, 0, > + Double.MIN_VALUE, > + FastMath.ulp(1d), > + 1, 3, 113, 4769, > + Double.MAX_VALUE, > + Double.POSITIVE_INFINITY }; > + final int from = 3; > + final int to = source.length + 14; > + final double[] dest = MathArrays.copyOfRange(source, from, to); > + > + Assert.assertEquals(dest.length, to - from); > + for (int i = from; i < source.length; i++) { > + Assert.assertEquals(source[i], dest[i - from], 0); > + } > + for (int i = source.length; i < dest.length; i++) { > + Assert.assertEquals(0, dest[i - from], 0); > + } > + } > + > // MATH-1005 > @Test > public void testLinearCombinationWithSingleElementArray() { > > >
