public boolean isMoveDoable(ScoreDirector scoreDirector) {
Object leftValue = variableDescriptor.getValue(leftEntity);
Object rightEntity = inverseVariableSupply.getInverseSingleton(rightValue);
if (ObjectUtils.equals(leftValue, rightValue)
|| ObjectUtils.equals(leftEntity, rightValue)
|| ObjectUtils.equals(rightEntity, leftValue)) {
return false;
}
if (rightEntity == null) {
Object leftAnchor = anchorVariableSupply.getAnchor(leftEntity);
Object rightAnchor = determineRightAnchor();
// TODO Currently unsupported because we fail to create a valid undoMove... even though doMove
// supports it
if (leftAnchor == rightAnchor) {
return false;
}
}
if (!variableDescriptor.isValueRangeEntityIndependent()) {
ValueRangeDescriptor valueRangeDescriptor = variableDescriptor.getValueRangeDescriptor();
Solution workingSolution = scoreDirector.getWorkingSolution();
if (rightEntity != null) {
ValueRange rightValueRange =
valueRangeDescriptor.extractValueRange(workingSolution, rightEntity);
if (!rightValueRange.contains(leftValue)) {
return false;
}
}
ValueRange leftValueRange =
valueRangeDescriptor.extractValueRange(workingSolution, leftEntity);
if (!leftValueRange.contains(rightValue)) {
return false;
}
}
return true;
}
@Override
protected void doMoveOnGenuineVariables(ScoreDirector scoreDirector) {
Object leftAnchor = anchorVariableSupply.getAnchor(leftEntity);
Object rightAnchor = determineRightAnchor();
Object leftValue = variableDescriptor.getValue(leftEntity);
Object rightEntity = inverseVariableSupply.getInverseSingleton(rightValue); // Sometimes null
if (leftAnchor != rightAnchor) {
// Change the left entity
scoreDirector.changeVariableFacade(variableDescriptor, leftEntity, rightValue);
// Change the right entity
if (rightEntity != null) {
scoreDirector.changeVariableFacade(variableDescriptor, rightEntity, leftValue);
}
} else {
Object lastEntityInChainOrLeftEntity = findLastEntityInChainOrLeftEntity();
if (lastEntityInChainOrLeftEntity == leftEntity) {
// Reverses loop on the side that doesn't include the anchor, because rightValue is earlier
// than leftEntity
Object leftNextEntity = inverseVariableSupply.getInverseSingleton(leftEntity);
scoreDirector.changeVariableFacade(variableDescriptor, leftEntity, rightValue);
reverseChain(scoreDirector, leftValue, leftEntity, rightEntity);
if (leftNextEntity != null) {
scoreDirector.changeVariableFacade(variableDescriptor, leftNextEntity, rightEntity);
}
} else {
// Reverses loop on the side that does include the anchor, because rightValue is later than
// leftEntity
Object lastEntityInChain = lastEntityInChainOrLeftEntity;
Object leftNextEntity = inverseVariableSupply.getInverseSingleton(leftEntity);
Object entityAfterAnchor = inverseVariableSupply.getInverseSingleton(leftAnchor);
// Change the head of the chain
reverseChain(scoreDirector, leftValue, leftEntity, entityAfterAnchor);
// Change leftEntity
scoreDirector.changeVariableFacade(variableDescriptor, leftEntity, rightValue);
// Change the tail of the chain
reverseChain(scoreDirector, lastEntityInChain, leftAnchor, rightEntity);
scoreDirector.changeVariableFacade(variableDescriptor, leftNextEntity, rightEntity);
}
}
}
public Move createUndoMove(ScoreDirector scoreDirector) {
Object leftAnchor = anchorVariableSupply.getAnchor(leftEntity);
Object rightAnchor = determineRightAnchor();
Object leftValue = variableDescriptor.getValue(leftEntity);
if (leftAnchor != rightAnchor) {
return new TailChainSwapMove(
variableDescriptor, inverseVariableSupply, anchorVariableSupply, leftEntity, leftValue);
} else {
Object rightEntity = inverseVariableSupply.getInverseSingleton(rightValue);
if (rightEntity != null) {
return new TailChainSwapMove(
variableDescriptor,
inverseVariableSupply,
anchorVariableSupply,
rightEntity,
rightValue);
} else {
// TODO Currently unsupported because we fail to create a valid undoMove... even though
// doMove supports it
throw new IllegalStateException(
"Impossible state, because isMoveDoable() should not return true.");
}
}
}
protected Object determineRightAnchor() {
return !variableDescriptor.isValueNoPotentialAnchor(rightValue)
? rightValue
: anchorVariableSupply.getAnchor(rightValue);
}