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/*
* User: anna
* Date: 08-Aug-2008
*/
package com.intellij.refactoring.typeMigration.rules;
import com.intellij.openapi.util.Pair;
import com.intellij.psi.*;
import com.intellij.psi.impl.PsiImplUtil;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.util.InheritanceUtil;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.refactoring.typeMigration.TypeConversionDescriptor;
import com.intellij.refactoring.typeMigration.TypeConversionDescriptorBase;
import com.intellij.refactoring.typeMigration.TypeMigrationLabeler;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.Nullable;
public class ListArrayConversionRule extends TypeConversionRule {
public TypeConversionDescriptorBase findConversion(final PsiType from,
final PsiType to,
PsiMember member,
final PsiExpression context,
final TypeMigrationLabeler labeler) {
PsiExpression expression = context;
PsiClassType classType = from instanceof PsiClassType ? (PsiClassType)from : to instanceof PsiClassType ? (PsiClassType)to : null;
PsiArrayType arrayType = from instanceof PsiArrayType ? (PsiArrayType)from : to instanceof PsiArrayType ? (PsiArrayType)to : null;
if (classType == null || arrayType == null) return null;
final PsiType collectionType = evaluateCollectionsType(classType, expression);
if (collectionType == null) return null;
if (member == null) {
final PsiMethodCallExpression callExpression = PsiTreeUtil.getParentOfType(context, PsiMethodCallExpression.class);
if (callExpression != null) {
member = callExpression.resolveMethod();
expression = callExpression;
}
}
if (member instanceof PsiMethod) {
TypeConversionDescriptor descriptor = changeCollectionCallsToArray((PsiMethod)member, context, collectionType, arrayType);
if (descriptor != null) return descriptor;
@NonNls final String memberName = member.getName();
assert memberName != null;
if (memberName.equals("sort")) {
if (((PsiMethod)member).getParameterList().getParametersCount() == 1) {
descriptor = new TypeConversionDescriptor("Arrays.sort($qualifier$)", "Collections.sort($qualifier$)", expression);
}
else {
descriptor =
new TypeConversionDescriptor("Arrays.sort($qualifier$, $expr$)", "Collections.sort($qualifier$, $expr$)", expression);
}
}
else if (memberName.equals("binarySearch")) {
if (((PsiMethod)member).getParameterList().getParametersCount() == 2) {
descriptor =
new TypeConversionDescriptor("Arrays.binarySearch($qualifier$, $key$)", "Collections.binarySearch($qualifier$, $key$)",
expression);
}
else {
descriptor = new TypeConversionDescriptor("Arrays.binarySearch($qualifier$, $key$, $comparator$)",
"Collections.binarySearch($qualifier$, $key$, $comparator$)", expression);
}
}
else if (memberName.equals("asList")) {
if (((PsiMethod)member).getParameterList().getParametersCount() == 1) {
descriptor =
new TypeConversionDescriptor("Arrays.asList($qualifier$)", "$qualifier$", expression);
}
}
else if (memberName.equals("fill")) {
descriptor = new TypeConversionDescriptor("Arrays.fill($qualifier$, $filler$)", "Collections.fill($qualifier$, $filler$)", expression);
}
if (descriptor != null) {
return from instanceof PsiClassType
? new TypeConversionDescriptor(descriptor.getReplaceByString(), descriptor.getStringToReplace(), descriptor.getExpression())
: descriptor;
}
}
if (member instanceof PsiField && member.getName().equals("length")) {
return new TypeConversionDescriptor("$qualifier$.length", "$qualifier$.size()");
}
final PsiElement parent = context.getParent();
if (parent instanceof PsiAssignmentExpression && ((PsiAssignmentExpression)parent).getLExpression() == context) {
if (TypeConversionUtil.isAssignable(collectionType, arrayType.getComponentType())) {
return new TypeConversionDescriptor("$qualifier$[$idx$] = $expr$", "$qualifier$.set($idx$, $expr$)",
(PsiExpression)parent);
}
}
else if (context instanceof PsiArrayAccessExpression && TypeConversionUtil.isAssignable(arrayType.getComponentType(), collectionType)) {
return new TypeConversionDescriptor("$qualifier$[$idx$]", "$qualifier$.get($idx$)");
}
return null;
}
@Nullable
public static PsiType evaluateCollectionsType(PsiClassType classType, PsiExpression expression) {
final PsiClassType.ClassResolveResult classResolveResult = PsiUtil.resolveGenericsClassInType(classType);
if (classResolveResult != null) {
final PsiClass psiClass = classResolveResult.getElement();
if (psiClass != null) {
final GlobalSearchScope allScope = GlobalSearchScope.allScope(psiClass.getProject());
final PsiClass collectionClass =
JavaPsiFacade.getInstance(psiClass.getProject()).findClass(CommonClassNames.JAVA_UTIL_LIST, allScope);
if (collectionClass != null && InheritanceUtil.isInheritorOrSelf(psiClass, collectionClass, true)) {
final PsiSubstitutor derivedSubstitutor = classResolveResult.getSubstitutor();
if (PsiUtil.isRawSubstitutor(psiClass, derivedSubstitutor)) return null;
final PsiSubstitutor substitutor =
TypeConversionUtil.getClassSubstitutor(collectionClass, psiClass, derivedSubstitutor);
assert substitutor != null;
final PsiType type = substitutor.substitute(collectionClass.getTypeParameters()[0]);
assert type != null;
return PsiImplUtil.normalizeWildcardTypeByPosition(type, expression);
}
}
}
return null;
}
@Override
public Pair<PsiType, PsiType> bindTypeParameters(final PsiType from,
final PsiType to,
final PsiMethod method,
final PsiExpression context,
final TypeMigrationLabeler labeler) {
if (findConversion(from, to, method, context, labeler) == null) return null;
if (from instanceof PsiArrayType && to instanceof PsiClassType) {
final PsiType collectionType = evaluateCollectionsType((PsiClassType)to, context);
if (collectionType != null) {
return Pair.create(((PsiArrayType)from).getComponentType(), collectionType);
}
}
if (to instanceof PsiArrayType && from instanceof PsiClassType) {
final PsiType collectionType = evaluateCollectionsType((PsiClassType)from, context);
if (collectionType != null) {
return Pair.create(collectionType, ((PsiArrayType)to).getComponentType());
}
}
return null;
}
@Nullable
private static TypeConversionDescriptor changeCollectionCallsToArray(final PsiMethod method,
final PsiElement context,
PsiType collectionType,
PsiArrayType arrayType) {
@NonNls final String methodName = method.getName();
if (methodName.equals("toArray")) {
if (method.getParameterList().getParameters().length == 0) {
return new TypeConversionDescriptor("$qualifier$.toArray()", "$qualifier$");
}
return new TypeConversionDescriptor("$qualifier$.toArray($expr$)", "$qualifier$");
}
else if (methodName.equals("size")) {
return new TypeConversionDescriptor("$qualifier$.size()", "$qualifier$.length");
}
else if (methodName.equals("get")) {
if (TypeConversionUtil.isAssignable(collectionType, arrayType.getComponentType())) {
return new TypeConversionDescriptor("$qualifier$.get($i$)", "$qualifier$[$i$]", PsiTreeUtil.getParentOfType(context, PsiMethodCallExpression.class));
}
}
else if (methodName.equals("set")) {
if (TypeConversionUtil.isAssignable(arrayType.getComponentType(), collectionType)) {
return new TypeConversionDescriptor("$qualifier$.set($i$, $val$)", "$qualifier$[$i$] = $val$");
}
}
return null;
}
}
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