package com.intellij.refactoring.typeMigration.intentions;
import com.intellij.codeInsight.daemon.JavaErrorMessages;
import com.intellij.codeInsight.hint.HintManager;
import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction;
import com.intellij.codeInsight.intention.impl.TypeExpression;
import com.intellij.codeInsight.template.*;
import com.intellij.codeInsight.template.impl.TemplateState;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.*;
import com.intellij.psi.search.LocalSearchScope;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.refactoring.typeMigration.TypeMigrationProcessor;
import com.intellij.refactoring.typeMigration.TypeMigrationRules;
import com.intellij.util.ArrayUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
/**
* @author anna
*/
public class ChangeClassParametersIntention extends PsiElementBaseIntentionAction {
private static final Logger LOG = Logger.getInstance("#" + ChangeClassParametersIntention.class);
@NotNull
@Override
public String getText() {
return getFamilyName();
}
@NotNull
@Override
public String getFamilyName() {
return "Change class type parameter";
}
@Override
public boolean isAvailable(@NotNull Project project, Editor editor, @NotNull PsiElement element) {
final PsiTypeElement typeElement = PsiTreeUtil.getTopmostParentOfType(element, PsiTypeElement.class);
final PsiElement parent = typeElement != null ? typeElement.getParent() : null;
final PsiReferenceParameterList parameterList = parent instanceof PsiReferenceParameterList ? (PsiReferenceParameterList)parent : null;
if (parameterList != null && parameterList.getTypeArguments().length > 0) {
final PsiMember member = PsiTreeUtil.getParentOfType(parameterList, PsiMember.class);
if (member instanceof PsiAnonymousClass) {
final PsiClassType.ClassResolveResult result = ((PsiAnonymousClass)member).getBaseClassType().resolveGenerics();
final PsiClass baseClass = result.getElement();
return baseClass != null && baseClass.getTypeParameters().length == parameterList.getTypeParameterElements().length &&
((PsiAnonymousClass)member).getBaseClassReference().getParameterList() == parameterList;
}
}
return false;
}
@Override
public void invoke(@NotNull final Project project, final Editor editor, @NotNull final PsiElement element) throws IncorrectOperationException {
final PsiTypeElement typeElement = PsiTreeUtil.getTopmostParentOfType(element, PsiTypeElement.class);
final PsiReferenceParameterList parameterList = PsiTreeUtil.getParentOfType(typeElement, PsiReferenceParameterList.class);
if (parameterList != null) {
final PsiClass aClass = PsiTreeUtil.getParentOfType(element, PsiClass.class);
if (aClass instanceof PsiAnonymousClass) {
editor.getCaretModel().moveToOffset(aClass.getTextOffset());
final PsiTypeElement[] typeElements = parameterList.getTypeParameterElements();
final int changeIdx = ArrayUtil.find(typeElements, typeElement);
final PsiClassType.ClassResolveResult result = ((PsiAnonymousClass)aClass).getBaseClassType().resolveGenerics();
final PsiClass baseClass = result.getElement();
LOG.assertTrue(baseClass != null);
final PsiTypeParameter typeParameter = baseClass.getTypeParameters()[changeIdx];
final TemplateBuilderImpl templateBuilder = (TemplateBuilderImpl)TemplateBuilderFactory.getInstance().createTemplateBuilder(aClass);
final String oldTypeText = typeElement.getText();
final String varName = "param";
templateBuilder.replaceElement(typeElement, varName, new TypeExpression(project, new PsiType[]{typeElement.getType()}), true);
final Template template = templateBuilder.buildInlineTemplate();
TemplateManager.getInstance(project).startTemplate(editor, template, false, null, new TemplateEditingAdapter() {
private String myNewType;
@Override
public void beforeTemplateFinished(TemplateState state, Template template) {
final TextResult value = state.getVariableValue(varName);
myNewType = value != null ? value.getText() : "";
final int segmentsCount = state.getSegmentsCount();
final Document document = state.getEditor().getDocument();
ApplicationManager.getApplication().runWriteAction(() -> {
for (int i = 0; i < segmentsCount; i++) {
final TextRange segmentRange = state.getSegmentRange(i);
document.replaceString(segmentRange.getStartOffset(), segmentRange.getEndOffset(), oldTypeText);
}
});
}
@Override
public void templateFinished(Template template, boolean brokenOff) {
if (!brokenOff) {
final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
try {
final PsiType targetParam = elementFactory.createTypeFromText(myNewType, aClass);
if (!(targetParam instanceof PsiClassType)) {
HintManager.getInstance().showErrorHint(editor,
JavaErrorMessages.message("generics.type.argument.cannot.be.of.primitive.type"));
return;
}
final PsiClassType classType = (PsiClassType)targetParam;
final PsiClass target = classType.resolve();
if (target == null) {
HintManager.getInstance().showErrorHint(editor, JavaErrorMessages.message("cannot.resolve.symbol",
classType.getPresentableText()));
return;
}
final TypeMigrationRules myRules = new TypeMigrationRules();
final PsiSubstitutor substitutor = result.getSubstitutor().put(typeParameter, targetParam);
final PsiType targetClassType = elementFactory.createType(baseClass, substitutor);
myRules.setBoundScope(new LocalSearchScope(aClass));
TypeMigrationProcessor.runHighlightingTypeMigration(project, editor, myRules,
((PsiAnonymousClass)aClass).getBaseClassReference().getParameterList(), targetClassType);
}
catch (IncorrectOperationException e) {
HintManager.getInstance().showErrorHint(editor, "Incorrect type");
}
}
}
});
}
}
}
@Override
public boolean startInWriteAction() {
return true;
}
}