Extract Woodbury engine from DC sensitivity analysis

src/main/java/com/powsybl/openloadflow/sensi/AbstractSensitivityAnalysis.java

@@ -101,10 +101,6 @@ enum Status {
 
  void setFunctionReference(double functionReference);
 
- double getBaseSensitivityValue();
-
- void setBaseCaseSensitivityValue(double baseCaseSensitivityValue);
-
  Status getStatus();
 
  void setStatus(Status status);
@@ -142,8 +138,6 @@ protected abstract static class AbstractLfSensitivityFactor<V extends Enum<V> &
 
  private double functionReference = 0d;
 
- private double baseCaseSensitivityValue = Double.NaN; // the sensitivity value on pre contingency network, that needs to be recomputed if the stack distribution change
-
  protected Status status = Status.VALID;
 
  protected SensitivityFactorGroup<V, E> group;
@@ -263,16 +257,6 @@ public void setFunctionReference(double functionReference) {
  this.functionReference = functionReference;
  }
 
- @Override
- public double getBaseSensitivityValue() {
- return baseCaseSensitivityValue;
- }
-
- @Override
- public void setBaseCaseSensitivityValue(double baseCaseSensitivityValue) {
- this.baseCaseSensitivityValue = baseCaseSensitivityValue;
- }
-
  @Override
  public Status getStatus() {
  return status;

src/main/java/com/powsybl/openloadflow/sensi/ComputedContingencyElement.java

@@ -28,8 +28,7 @@ public final class ComputedContingencyElement {
 
  private int contingencyIndex = -1; // index of the element in the rhs for +1-1
  private int localIndex = -1; // local index of the element : index of the element in the matrix used in the setAlphas method
- private double alphaForSensitivityValue = Double.NaN;
- private double alphaForFunctionReference = Double.NaN;
+ private double alphaForPostContingencyState = Double.NaN;
  private final ContingencyElement element;
  private final LfBranch lfBranch;
  private final ClosedBranchSide1DcFlowEquationTerm branchEquation;
@@ -56,20 +55,12 @@ private void setLocalIndex(final int index) {
  this.localIndex = index;
  }
 
- public double getAlphaForSensitivityValue() {
- return alphaForSensitivityValue;
+ public double getAlphaForPostContingencyState() {
+ return alphaForPostContingencyState;
  }
 
- public void setAlphaForSensitivityValue(final double alpha) {
- this.alphaForSensitivityValue = alpha;
- }
-
- public double getAlphaForFunctionReference() {
- return alphaForFunctionReference;
- }
-
- public void setAlphaForFunctionReference(final double alpha) {
- this.alphaForFunctionReference = alpha;
+ public void setAlphaForPostContingencyState(double alphaForPostContingencyStates) {
+ this.alphaForPostContingencyState = alphaForPostContingencyStates;
  }
 
  public ContingencyElement getElement() {