Merge pull request #375 from Serrof/issue-374

Removed some code smells

hipparchus-core/src/main/java/org/hipparchus/analysis/interpolation/FieldHermiteInterpolator.java

@@ -91,7 +91,7 @@ public FieldHermiteInterpolator() {
      */
     @SafeVarargs
     public final void addSamplePoint(final T x, final T[] ... value)
-        throws MathIllegalArgumentException, MathRuntimeException,
+        throws MathRuntimeException,
                NullArgumentException {
 
         MathUtils.checkNotNull(x);

hipparchus-core/src/main/java/org/hipparchus/analysis/interpolation/HermiteInterpolator.java

@@ -90,7 +90,7 @@ public HermiteInterpolator() {
      * than 20, which prevents computation of a factorial
      */
     public void addSamplePoint(final double x, final double[] ... value)
-        throws MathIllegalArgumentException, MathRuntimeException {
+        throws MathRuntimeException {
 
         for (int i = 0; i < value.length; ++i) {
 

hipparchus-core/src/main/java/org/hipparchus/analysis/solvers/AllowedSolution.java

@@ -71,6 +71,6 @@ public enum AllowedSolution {
      * acceptable as solutions for root-finding. So, if a function f(x) has
      * a root at x = x0, then the root-finding result s must satisfy f(s) >= 0.
      */
-    ABOVE_SIDE;
+    ABOVE_SIDE
 
 }

hipparchus-core/src/main/java/org/hipparchus/analysis/solvers/BaseSecantSolver.java

@@ -265,7 +265,7 @@ protected enum Method {
         ILLINOIS,
 
         /** The {@link PegasusSolver <em>Pegasus</em>} method. */
-        PEGASUS;
+        PEGASUS
 
     }
 }

hipparchus-core/src/main/java/org/hipparchus/analysis/solvers/LaguerreSolver.java

@@ -296,9 +296,7 @@ public Complex[] solveAll(Complex[] coefficients, Complex initial)
             }
             // Coefficients for deflated polynomial.
             final Complex[] c = new Complex[n + 1];
-            for (int i = 0; i <= n; i++) {
-                c[i] = coefficients[i];
-            }
+            System.arraycopy(coefficients, 0, c, 0, n + 1);
 
             // Solve individual roots successively.
             final Complex[] root = new Complex[n];

hipparchus-core/src/main/java/org/hipparchus/complex/ComplexFormat.java

@@ -143,7 +143,7 @@ public ComplexFormat(String imaginaryCharacter,
         if (imaginaryCharacter == null) {
             throw new NullArgumentException();
         }
-        if (imaginaryCharacter.length() == 0) {
+        if (imaginaryCharacter.isEmpty()) {
             throw new MathIllegalArgumentException(LocalizedCoreFormats.NO_DATA);
         }
         MathUtils.checkNotNull(imaginaryFormat, LocalizedCoreFormats.IMAGINARY_FORMAT);
@@ -376,7 +376,7 @@ public Complex parse(String source, ParsePosition pos) {
         // parse sign
         int startIndex = pos.getIndex();
         char c = CompositeFormat.parseNextCharacter(source, pos);
-        int sign = 0;
+        int sign;
         switch (c) {
         case 0 :
             // no sign

hipparchus-core/src/main/java/org/hipparchus/dfp/Dfp.java

@@ -1594,7 +1594,7 @@ public Dfp subtract(final Dfp x) {
      * @return the IEEE flag if an exception occurred
      */
     protected int round(int n) {
-        boolean inc = false;
+        boolean inc;
         switch (field.getRoundingMode()) {
             case ROUND_DOWN:
                 inc = false;
@@ -2032,9 +2032,7 @@ public Dfp divide(Dfp divisor) {
 
             /* move the remainder into the dividend while left shifting */
             dividend[0] = 0;
-            for (int i = 0; i < mant.length; i++) {
-                dividend[i + 1] = remainder[i];
-            }
+            System.arraycopy(remainder, 0, dividend, 1, mant.length);
         }
 
         /* Find the most sig digit */

hipparchus-core/src/main/java/org/hipparchus/dfp/DfpField.java

@@ -55,7 +55,7 @@ public enum RoundingMode {
         ROUND_CEIL,
 
         /** Rounds towards negative infinity. */
-        ROUND_FLOOR;
+        ROUND_FLOOR
 
     }
 

hipparchus-core/src/main/java/org/hipparchus/linear/ArrayFieldVector.java

@@ -600,7 +600,7 @@ public ArrayFieldVector<T> ebeMultiply(ArrayFieldVector<T> v)
     /** {@inheritDoc} */
     @Override
     public FieldVector<T> ebeDivide(FieldVector<T> v)
-        throws MathIllegalArgumentException, MathRuntimeException {
+        throws MathRuntimeException {
         if (v instanceof ArrayFieldVector) {
             return ebeDivide((ArrayFieldVector<T>) v);
         } else {
@@ -684,7 +684,7 @@ public T dotProduct(ArrayFieldVector<T> v)
     /** {@inheritDoc} */
     @Override
     public FieldVector<T> projection(FieldVector<T> v)
-        throws MathIllegalArgumentException, MathRuntimeException {
+        throws MathRuntimeException {
         return v.mapMultiply(dotProduct(v).divide(v.dotProduct(v)));
     }
 

hipparchus-core/src/main/java/org/hipparchus/linear/HessenbergTransformer.java

@@ -156,9 +156,7 @@ public RealMatrix getH() {
                 }
 
                 // copy upper triangular part of the matrix
-                for (int j = i; j < m; ++j) {
-                    h[i][j] = householderVectors[i][j];
-                }
+                System.arraycopy(householderVectors[i], i, h[i], i, m - i);
             }
             cachedH = MatrixUtils.createRealMatrix(h);
         }

hipparchus-core/src/main/java/org/hipparchus/linear/RealMatrixFormat.java

@@ -329,7 +329,7 @@ public RealMatrix parse(String source, ParsePosition pos) {
             if (!rowComponents.isEmpty()) {
                 CompositeFormat.parseAndIgnoreWhitespace(source, pos);
                 if (!CompositeFormat.parseFixedstring(source, trimmedColumnSeparator, pos)) {
-                    if (trimmedRowSuffix.length() != 0 &&
+                    if (!trimmedRowSuffix.isEmpty() &&
                         !CompositeFormat.parseFixedstring(source, trimmedRowSuffix, pos)) {
                         return null;
                     } else {
@@ -345,7 +345,7 @@ public RealMatrix parse(String source, ParsePosition pos) {
                 }
             } else {
                 CompositeFormat.parseAndIgnoreWhitespace(source, pos);
-                if (trimmedRowPrefix.length() != 0 &&
+                if (!trimmedRowPrefix.isEmpty() &&
                     !CompositeFormat.parseFixedstring(source, trimmedRowPrefix, pos)) {
                     return null;
                 }

hipparchus-core/src/main/java/org/hipparchus/linear/RealVector.java

@@ -1425,7 +1425,7 @@ public double dotProduct(RealVector w)
             /** {@inheritDoc} */
             @Override
             public double cosine(RealVector w)
-                throws MathIllegalArgumentException, MathRuntimeException {
+                throws MathRuntimeException {
                 return v.cosine(w);
             }
 

hipparchus-core/src/main/java/org/hipparchus/linear/SparseFieldVector.java

@@ -237,7 +237,7 @@ public T dotProduct(FieldVector<T> v) throws MathIllegalArgumentException {
     /** {@inheritDoc} */
     @Override
     public FieldVector<T> ebeDivide(FieldVector<T> v)
-        throws MathIllegalArgumentException, MathRuntimeException {
+        throws MathRuntimeException {
         checkVectorDimensions(v.getDimension());
         SparseFieldVector<T> res = new SparseFieldVector<>(this);
         OpenIntToFieldHashMap<T>.Iterator iter = res.entries.iterator();
@@ -425,7 +425,7 @@ public FieldMatrix<T> outerProduct(FieldVector<T> v) {
     /** {@inheritDoc} */
     @Override
     public FieldVector<T> projection(FieldVector<T> v)
-        throws MathIllegalArgumentException, MathRuntimeException {
+        throws MathRuntimeException {
         checkVectorDimensions(v.getDimension());
         return v.mapMultiply(dotProduct(v).divide(v.dotProduct(v)));
     }

hipparchus-core/src/main/java/org/hipparchus/linear/SymmLQ.java

@@ -879,7 +879,7 @@ public final boolean shouldCheck() {
     @Override
     public RealVector solve(final RealLinearOperator a,
         final RealLinearOperator m, final RealVector b) throws
-        MathIllegalArgumentException, NullArgumentException, MathIllegalStateException, MathIllegalArgumentException {
+            NullArgumentException, MathIllegalStateException, MathIllegalArgumentException {
         MathUtils.checkNotNull(a);
         final RealVector x = new ArrayRealVector(a.getColumnDimension());
         return solveInPlace(a, m, b, x, false, 0.);
@@ -947,7 +947,7 @@ public RealVector solve(final RealLinearOperator a, final RealLinearOperator m,
     @Override
     public RealVector solve(final RealLinearOperator a,
         final RealLinearOperator m, final RealVector b, final RealVector x)
-        throws MathIllegalArgumentException, NullArgumentException,
+        throws NullArgumentException,
         MathIllegalArgumentException,
         MathIllegalStateException {
         MathUtils.checkNotNull(x);
@@ -963,7 +963,7 @@ public RealVector solve(final RealLinearOperator a,
      */
     @Override
     public RealVector solve(final RealLinearOperator a, final RealVector b)
-        throws MathIllegalArgumentException, NullArgumentException,
+        throws NullArgumentException,
         MathIllegalArgumentException, MathIllegalStateException {
         MathUtils.checkNotNull(a);
         final RealVector x = new ArrayRealVector(a.getColumnDimension());
@@ -1025,7 +1025,7 @@ public RealVector solve(final RealLinearOperator a, final RealVector b,
      */
     @Override
     public RealVector solve(final RealLinearOperator a, final RealVector b,
-        final RealVector x) throws MathIllegalArgumentException, NullArgumentException, MathIllegalArgumentException,
+        final RealVector x) throws NullArgumentException, MathIllegalArgumentException,
         MathIllegalStateException {
         MathUtils.checkNotNull(x);
         return solveInPlace(a, null, b, x.copy(), false, 0.);
@@ -1045,7 +1045,7 @@ public RealVector solve(final RealLinearOperator a, final RealVector b,
     @Override
     public RealVector solveInPlace(final RealLinearOperator a,
         final RealLinearOperator m, final RealVector b, final RealVector x)
-        throws MathIllegalArgumentException, NullArgumentException,
+        throws NullArgumentException,
         MathIllegalArgumentException,
         MathIllegalStateException {
         return solveInPlace(a, m, b, x, false, 0.);
@@ -1161,7 +1161,7 @@ public RealVector solveInPlace(final RealLinearOperator a,
      */
     @Override
     public RealVector solveInPlace(final RealLinearOperator a,
-        final RealVector b, final RealVector x) throws MathIllegalArgumentException, NullArgumentException, MathIllegalArgumentException,
+        final RealVector b, final RealVector x) throws NullArgumentException, MathIllegalArgumentException,
         MathIllegalStateException {
         return solveInPlace(a, null, b, x, false, 0.);
     }

hipparchus-fft/src/main/java/org/hipparchus/transform/DctNormalization.java

@@ -66,5 +66,5 @@ public enum DctNormalization {
      * </ul>
      * which makes the transform orthogonal. N is the size of the data sample.
      */
-    ORTHOGONAL_DCT_I;
+    ORTHOGONAL_DCT_I
 }

hipparchus-fft/src/main/java/org/hipparchus/transform/DftNormalization.java

@@ -56,5 +56,5 @@ public enum DftNormalization {
      * </ul>
      * which makes the transform unitary. N is the size of the data sample.
      */
-    UNITARY;
+    UNITARY
 }

hipparchus-fft/src/main/java/org/hipparchus/transform/TransformType.java

@@ -30,5 +30,5 @@ public enum TransformType {
     FORWARD,
 
     /** The type to be specified for inverse transforms. */
-    INVERSE;
+    INVERSE
 }

hipparchus-geometry/src/main/java/org/hipparchus/geometry/euclidean/threed/RotationConvention.java

@@ -78,6 +78,6 @@ public enum RotationConvention {
      * rotation angle. This is how things were done up to version 3.5.
      * </p>
      */
-    FRAME_TRANSFORM;
+    FRAME_TRANSFORM
 
 }

hipparchus-geometry/src/main/java/org/hipparchus/geometry/partitioning/Side.java

@@ -36,6 +36,6 @@ public enum Side {
     BOTH,
 
     /** Code for the hyperplane itself. */
-    HYPER;
+    HYPER
 
 }

hipparchus-ode/src/main/java/org/hipparchus/ode/AbstractFieldIntegrator.java

@@ -320,7 +320,7 @@ protected FieldODEStateAndDerivative<T> acceptStep(final AbstractFieldODEStateIn
         }
 
         // set end of step
-        stepEndEventsStates.stream().forEach(s -> s.setStepEnd(currentState.getTime()));
+        stepEndEventsStates.forEach(s -> s.setStepEnd(currentState.getTime()));
 
         // search for next events that may occur during the step
         final int orderingSign = interpolator.isForward() ? +1 : -1;

hipparchus-ode/src/main/java/org/hipparchus/ode/AbstractParameterizable.java

@@ -18,6 +18,7 @@
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 
 import org.hipparchus.exception.MathIllegalArgumentException;
@@ -36,9 +37,7 @@ public abstract class AbstractParameterizable implements Parameterizable {
      */
     protected AbstractParameterizable(final String ... names) {
         parametersNames = new ArrayList<>();
-        for (final String name : names) {
-            parametersNames.add(name);
-        }
+        Collections.addAll(parametersNames, names);
     }
 
     /** Simple constructor.

hipparchus-ode/src/main/java/org/hipparchus/ode/DenseOutputModel.java

@@ -164,9 +164,7 @@ public void append(final DenseOutputModel model)
 
         }
 
-        for (ODEStateInterpolator interpolator : model.steps) {
-            steps.add(interpolator);
-        }
+        steps.addAll(model.steps);
 
         index = steps.size() - 1;
         finalTime = (steps.get(index)).getCurrentState().getTime();

hipparchus-ode/src/main/java/org/hipparchus/ode/FieldDenseOutputModel.java

@@ -157,9 +157,7 @@ public void append(final FieldDenseOutputModel<T> model)
 
         }
 
-        for (FieldODEStateInterpolator<T> interpolator : model.steps) {
-            steps.add(interpolator);
-        }
+        steps.addAll(model.steps);
 
         index = steps.size() - 1;
         finalTime = (steps.get(index)).getCurrentState().getTime();

hipparchus-ode/src/main/java/org/hipparchus/ode/events/Action.java

@@ -67,6 +67,6 @@ public enum Action {
      * the {@link ODEEventDetector#g(org.hipparchus.ode.ODEStateAndDerivative)}
      * function of another event handler.
      */
-    RESET_EVENTS;
+    RESET_EVENTS
 
 }

hipparchus-ode/src/main/java/org/hipparchus/ode/nonstiff/AdaptiveStepsizeFieldIntegrator.java

@@ -27,7 +27,6 @@
 import org.hipparchus.exception.MathIllegalArgumentException;
 import org.hipparchus.exception.MathIllegalStateException;
 import org.hipparchus.ode.AbstractFieldIntegrator;
-import org.hipparchus.ode.FieldEquationsMapper;
 import org.hipparchus.ode.FieldODEState;
 import org.hipparchus.ode.FieldODEStateAndDerivative;
 import org.hipparchus.util.FastMath;
@@ -195,14 +194,12 @@ protected void sanityChecks(final FieldODEState<T> initialState, final T t)
      * @param order order of the method
      * @param scale scaling vector for the state vector (can be shorter than state vector)
      * @param state0 state at integration start time
-     * @param mapper mapper for all the equations
      * @return first integration step
      * @exception MathIllegalStateException if the number of functions evaluations is exceeded
      * @exception MathIllegalArgumentException if arrays dimensions do not match equations settings
      */
     public double initializeStep(final boolean forward, final int order, final T[] scale,
-                                 final FieldODEStateAndDerivative<T> state0,
-                                 final FieldEquationsMapper<T> mapper)
+                                 final FieldODEStateAndDerivative<T> state0)
         throws MathIllegalArgumentException, MathIllegalStateException {
 
         if (stepsizeHelper.getInitialStep() > 0) {

hipparchus-ode/src/main/java/org/hipparchus/ode/nonstiff/EmbeddedRungeKuttaFieldIntegrator.java

@@ -279,7 +279,7 @@ public FieldODEStateAndDerivative<T> integrate(final FieldExpandableODE<T> equat
                     for (int i = 0; i < scale.length; ++i) {
                         scale[i] = helper.getTolerance(i, y[i].abs());
                     }
-                    hNew = getField().getZero().add(initializeStep(forward, getOrder(), scale, getStepStart(), equations.getMapper()));
+                    hNew = getField().getZero().add(initializeStep(forward, getOrder(), scale, getStepStart()));
                     firstTime = false;
                 }
 

hipparchus-ode/src/main/java/org/hipparchus/ode/sampling/StepNormalizerMode.java

@@ -70,5 +70,5 @@ public enum StepNormalizerMode {
      * @see StepNormalizer
      * @see StepNormalizerBounds
      */
-    MULTIPLES;
+    MULTIPLES
 }

hipparchus-optim/src/main/java/org/hipparchus/optim/linear/LinearConstraintSet.java

@@ -43,9 +43,7 @@ public class LinearConstraintSet implements OptimizationData {
      */
     public LinearConstraintSet(LinearConstraint... constraints) {
         linearConstraints = new LinkedHashSet<>();
-        for (LinearConstraint c : constraints) {
-            linearConstraints.add(c);
-        }
+        Collections.addAll(linearConstraints, constraints);
     }
 
     /**

hipparchus-optim/src/main/java/org/hipparchus/optim/nonlinear/scalar/noderiv/BOBYQAOptimizer.java

@@ -1431,7 +1431,7 @@ private double[] altmov(int knew, double adelt) {
 
         final double bigstp = adelt + adelt;
         int iflag = 0;
-        double cauchy = Double.NaN;
+        double cauchy;
         double csave = ZERO;
         while (true) {
             double wfixsq = ZERO;

hipparchus-optim/src/main/java/org/hipparchus/optim/nonlinear/vector/leastsquares/LevenbergMarquardtOptimizer.java

@@ -349,9 +349,7 @@ public Optimum optimize(final LeastSquaresProblem problem) {
 
             //residuals already have weights applied
             double[] weightedResidual = currentResiduals;
-            for (int i = 0; i < nR; i++) {
-                qtf[i] = weightedResidual[i];
-            }
+            System.arraycopy(weightedResidual, 0, qtf, 0, nR);
 
             // compute Qt.res
             qTy(qtf, internalData);

hipparchus-samples/src/main/java/org/hipparchus/samples/IntegerDistributionComparison.java

@@ -234,7 +234,7 @@ public Display() {
             c.gridy = 0;
             c.insets = new Insets(2, 2, 2, 2);
 
-            JComponent comp = null;
+            JComponent comp;
 
             comp = createComponent("Binomial", 0, 40,
                                    new String[] { "p=0.5,n=20", "p=0.7,n=20", "p=0.5,n=40" },