private static boolean acceptExtendsBound(PsiClassType extendsBound, int depth) {
PsiType[] parameters = extendsBound.getParameters();
if (parameters.length == 1) {
PsiType argType = parameters[0];
if (argType instanceof PsiCapturedWildcardType && depth == 0) {
argType = ((PsiCapturedWildcardType) argType).getWildcard();
}
if (argType instanceof PsiWildcardType) {
if (!((PsiWildcardType) argType).isBounded()) return true;
final PsiType bound = ((PsiWildcardType) argType).getExtendsBound();
if (bound instanceof PsiClassType
&& TypeConversionUtil.erasure(bound).equals(TypeConversionUtil.erasure(extendsBound))) {
return acceptExtendsBound((PsiClassType) bound, depth + 1);
}
if (bound instanceof PsiIntersectionType) {
for (PsiType extendsType : ((PsiIntersectionType) bound).getConjuncts()) {
if (acceptExtendsBound(extendsBound, extendsType)) {
return true;
}
}
}
}
}
return false;
}
@Nullable
private static PsiType getGenericElementType(PsiType collectionType) {
if (collectionType instanceof PsiClassType) {
PsiClassType classType = (PsiClassType) collectionType;
PsiType[] parameters = classType.getParameters();
if (parameters.length == 1) {
return parameters[0];
}
}
return null;
}
public Boolean visitClassType(final PsiClassType classType) {
final PsiClass aClass = classType.resolve();
if (aClass instanceof PsiTypeParameter && myTypeParams.contains((PsiTypeParameter) aClass))
return true;
final PsiType[] types = classType.getParameters();
for (final PsiType psiType : types) {
if (psiType.accept(this).booleanValue()) return true;
}
return false;
}
@Override
public Boolean visitClassType(PsiClassType classType) {
boolean used = false;
for (PsiType paramType : classType.getParameters()) {
final Boolean paramAccepted = paramType.accept(this);
used |= paramAccepted != null && paramAccepted.booleanValue();
}
final PsiClass resolve = classType.resolve();
if (resolve instanceof PsiTypeParameter) {
final PsiTypeParameter typeParameter = (PsiTypeParameter) resolve;
if (check(typeParameter)) {
myUsedTypeParams.add(typeParameter);
return true;
}
}
return used;
}
public boolean incorporate() {
final Collection<InferenceVariable> inferenceVariables = mySession.getInferenceVariables();
final PsiSubstitutor substitutor =
mySession.retrieveNonPrimitiveEqualsBounds(inferenceVariables);
for (InferenceVariable inferenceVariable : inferenceVariables) {
if (inferenceVariable.getInstantiation() != PsiType.NULL) continue;
final List<PsiType> eqBounds = inferenceVariable.getBounds(InferenceBound.EQ);
final List<PsiType> upperBounds = inferenceVariable.getBounds(InferenceBound.UPPER);
final List<PsiType> lowerBounds = inferenceVariable.getBounds(InferenceBound.LOWER);
eqEq(eqBounds);
upDown(lowerBounds, upperBounds, substitutor);
upDown(eqBounds, upperBounds, substitutor);
upDown(lowerBounds, eqBounds, substitutor);
upUp(upperBounds);
}
for (Pair<PsiTypeParameter[], PsiClassType> capture : myCaptures) {
final PsiClassType right = capture.second;
final PsiClass gClass = right.resolve();
LOG.assertTrue(gClass != null);
final PsiTypeParameter[] parameters = capture.first;
PsiType[] typeArgs = right.getParameters();
if (parameters.length != typeArgs.length) continue;
for (int i = 0; i < typeArgs.length; i++) {
PsiType aType = typeArgs[i];
if (aType instanceof PsiCapturedWildcardType) {
aType = ((PsiCapturedWildcardType) aType).getWildcard();
}
final InferenceVariable inferenceVariable = mySession.getInferenceVariable(parameters[i]);
LOG.assertTrue(inferenceVariable != null);
final List<PsiType> eqBounds = inferenceVariable.getBounds(InferenceBound.EQ);
final List<PsiType> upperBounds = inferenceVariable.getBounds(InferenceBound.UPPER);
final List<PsiType> lowerBounds = inferenceVariable.getBounds(InferenceBound.LOWER);
if (aType instanceof PsiWildcardType) {
for (PsiType eqBound : eqBounds) {
if (!isInferenceVariableOrFreshTypeParameter(eqBound)) return false;
}
final PsiClassType[] paramBounds = inferenceVariable.getParameter().getExtendsListTypes();
PsiType glb = null;
for (PsiClassType paramBound : paramBounds) {
if (glb == null) {
glb = paramBound;
} else {
glb = GenericsUtil.getGreatestLowerBound(glb, paramBound);
}
}
if (!((PsiWildcardType) aType).isBounded()) {
for (PsiType upperBound : upperBounds) {
if (glb != null && mySession.getInferenceVariable(upperBound) == null) {
addConstraint(
new StrictSubtypingConstraint(
upperBound, mySession.substituteWithInferenceVariables(glb)));
}
}
for (PsiType lowerBound : lowerBounds) {
if (isInferenceVariableOrFreshTypeParameter(lowerBound)) return false;
}
} else if (((PsiWildcardType) aType).isExtends()) {
final PsiType extendsBound = ((PsiWildcardType) aType).getExtendsBound();
for (PsiType upperBound : upperBounds) {
if (mySession.getInferenceVariable(upperBound) == null) {
if (paramBounds.length == 1
&& paramBounds[0].equalsToText(CommonClassNames.JAVA_LANG_OBJECT)
|| paramBounds.length == 0) {
addConstraint(new StrictSubtypingConstraint(upperBound, extendsBound));
} else if (extendsBound.equalsToText(CommonClassNames.JAVA_LANG_OBJECT)
&& glb != null) {
addConstraint(
new StrictSubtypingConstraint(
upperBound, mySession.substituteWithInferenceVariables(glb)));
}
}
}
for (PsiType lowerBound : lowerBounds) {
if (isInferenceVariableOrFreshTypeParameter(lowerBound)) return false;
}
} else {
LOG.assertTrue(((PsiWildcardType) aType).isSuper());
final PsiType superBound = ((PsiWildcardType) aType).getSuperBound();
for (PsiType upperBound : upperBounds) {
if (glb != null && mySession.getInferenceVariable(upperBound) == null) {
addConstraint(
new StrictSubtypingConstraint(
mySession.substituteWithInferenceVariables(glb), upperBound));
}
}
for (PsiType lowerBound : lowerBounds) {
if (mySession.getInferenceVariable(lowerBound) == null) {
addConstraint(new StrictSubtypingConstraint(lowerBound, superBound));
}
}
}
} else {
inferenceVariable.addBound(aType, InferenceBound.EQ);
}
}
}
return true;
}