MATH-1630: Runtime switch between JDK and CM implementations of the methods defined in "java.lang.Math".

Default is to use the CM implementations in order to retain previous behaviour.
When using the JDK implementations, some unit tests fail (on Java 8).

Class "AccurateMath" was moved to "o.a.c.math4.core" package.
[Unit tests for that class were not moved because they depend on "legacy" classes.]

Author: Gilles Sadowski

…h4/legacy/core/jdkmath/AccurateMath.java …ons/math4/core/jdkmath/AccurateMath.javacommons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMath.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMath.java commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMath.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMath.java

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.commons.math4.legacy.core.jdkmath;
+package org.apache.commons.math4.core.jdkmath;
 
 import java.io.PrintStream;
 

…egacy/core/jdkmath/AccurateMathCalc.java …math4/core/jdkmath/AccurateMathCalc.javacommons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMathCalc.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMathCalc.java commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMathCalc.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMathCalc.java

@@ -14,11 +14,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.commons.math4.legacy.core.jdkmath;
+package org.apache.commons.math4.core.jdkmath;
 
 import java.io.PrintStream;
 
-import org.apache.commons.math4.legacy.exception.DimensionMismatchException;
 
 /** Class used to compute the classical functions tables.
  * @since 3.0
@@ -647,12 +646,11 @@ static String format(double d) {
      * Check two lengths are equal.
      * @param expectedLen expected length
      * @param actual actual length
-     * @exception DimensionMismatchException if the two lengths are not equal
+     * @throws IllegalStateException if the two lengths are not equal
      */
-    private static void checkLen(int expectedLen, int actual)
-        throws DimensionMismatchException {
+    private static void checkLen(int expectedLen, int actual) {
         if (expectedLen != actual) {
-            throw new DimensionMismatchException(actual, expectedLen);
+            throw new IllegalStateException(actual + " != " + expectedLen);
         }
     }
 }

…e/jdkmath/AccurateMathLiteralArrays.java …e/jdkmath/AccurateMathLiteralArrays.javacommons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMathLiteralArrays.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMathLiteralArrays.java commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMathLiteralArrays.java renamed to commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMathLiteralArrays.java

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package org.apache.commons.math4.legacy.core.jdkmath;
+package org.apache.commons.math4.core.jdkmath;
 
 /**
  * Utility class for loading tabulated data used by {@link AccurateMath}.