/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.plugins.groovy.refactoring.introduce.parameter;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.psi.search.LocalSearchScope;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.psi.util.InheritanceUtil;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElement;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory;
import org.jetbrains.plugins.groovy.lang.psi.GroovyRecursiveElementVisitor;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.blocks.GrCodeBlock;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;
import org.jetbrains.plugins.groovy.lang.resolve.ResolveUtil;
import java.util.ArrayList;
import java.util.List;
/**
* @author Maxim.Medvedev
*/
public class FieldConflictsResolver {
private static final Logger LOG =
Logger.getInstance("#org.jetbrains.plugins.groovy.refactoring.introduce.parameter.FieldConflictsResolver");
private final GrCodeBlock myScope;
private PsiField myField = null;
private List<GrReferenceExpression> myReferenceExpressions = null;
private PsiClass myQualifyingClass;
public FieldConflictsResolver(String name, GrCodeBlock scope) {
myScope = scope;
if (myScope == null) return;
final GroovyPsiElement resolved = ResolveUtil.resolveProperty(myScope, name);
if (resolved instanceof GrReferenceExpression || resolved == null) return;
assert resolved instanceof PsiVariable;
final PsiVariable oldVariable = (PsiVariable)resolved;
myField = oldVariable instanceof PsiField ? (PsiField) oldVariable : null;
if (!(oldVariable instanceof PsiField)) return;
myReferenceExpressions = new ArrayList<>();
for (PsiReference reference : ReferencesSearch.search(myField, new LocalSearchScope(myScope), false)) {
final PsiElement element = reference.getElement();
if (element instanceof GrReferenceExpression) {
final GrReferenceExpression referenceExpression = (GrReferenceExpression)element;
if (referenceExpression.getQualifier() == null) {
myReferenceExpressions.add(referenceExpression);
}
}
}
if (myField.hasModifierProperty(PsiModifier.STATIC)) {
myQualifyingClass = myField.getContainingClass();
}
}
public GrExpression fixInitializer(GrExpression initializer) {
if (myField == null) return initializer;
final GrReferenceExpression[] replacedRef = {null};
initializer.accept(new GroovyRecursiveElementVisitor() {
@Override
public void visitReferenceExpression(@NotNull GrReferenceExpression expression) {
final GrExpression qualifierExpression = expression.getQualifier();
if (qualifierExpression != null) {
qualifierExpression.accept(this);
}
else {
final PsiElement result = expression.resolve();
if (expression.getManager().areElementsEquivalent(result, myField)) {
try {
replacedRef[0] = qualifyReference(expression, myField, myQualifyingClass);
}
catch (IncorrectOperationException e) {
LOG.error(e);
}
}
}
}
});
if (!initializer.isValid()) return replacedRef[0];
return initializer;
}
public void fix() throws IncorrectOperationException {
if (myField == null) return;
final PsiManager manager = myScope.getManager();
for (GrReferenceExpression referenceExpression : myReferenceExpressions) {
if (!referenceExpression.isValid()) continue;
final PsiElement newlyResolved = referenceExpression.resolve();
if (!manager.areElementsEquivalent(newlyResolved, myField)) {
qualifyReference(referenceExpression, myField, myQualifyingClass);
}
}
}
public static GrReferenceExpression qualifyReference(GrReferenceExpression referenceExpression,
final PsiMember member,
@Nullable final PsiClass qualifyingClass) throws IncorrectOperationException {
PsiManager manager = referenceExpression.getManager();
GrReferenceExpression expressionFromText;
final GroovyPsiElementFactory factory = GroovyPsiElementFactory.getInstance(referenceExpression.getProject());
if (qualifyingClass == null) {
PsiClass parentClass = PsiTreeUtil.getParentOfType(referenceExpression, PsiClass.class);
final PsiClass containingClass = member.getContainingClass();
if (parentClass != null && !InheritanceUtil.isInheritorOrSelf(parentClass, containingClass, true)) {
while (parentClass != null && !InheritanceUtil.isInheritorOrSelf(parentClass, containingClass, true)) {
parentClass = PsiTreeUtil.getParentOfType(parentClass, PsiClass.class, true);
}
LOG.assertTrue(parentClass != null);
expressionFromText = factory.createReferenceExpressionFromText("A.this." + member.getName());
//noinspection ConstantConditions
((GrReferenceExpression)expressionFromText.getQualifier()).getQualifier().replace(factory.createReferenceElementForClass(parentClass));
}
else {
expressionFromText = (GrReferenceExpression)factory.createExpressionFromText("this." + member.getName());
}
}
else {
expressionFromText = (GrReferenceExpression)factory.createExpressionFromText("A." + member.getName());
expressionFromText.setQualifier(factory.createReferenceElementForClass(qualifyingClass));
}
CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(manager.getProject());
expressionFromText = (GrReferenceExpression)codeStyleManager.reformat(expressionFromText);
return (GrReferenceExpression)referenceExpression.replace(expressionFromText);
}
}