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/*
* Copyright 2003-2013 Dave Griffith, Bas Leijdekkers
*
* 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 com.siyeh.ig.abstraction;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.codeInspection.ui.SingleCheckboxOptionsPanel;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiUtil;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.InspectionGadgetsFix;
import com.siyeh.ig.PsiReplacementUtil;
import com.siyeh.ig.psiutils.ExpectedTypeUtils;
import com.siyeh.ig.psiutils.InstanceOfUtils;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
public class OverlyStrongTypeCastInspection extends BaseInspection {
@SuppressWarnings({"PublicField"})
public boolean ignoreInMatchingInstanceof = false;
@Override
@NotNull
public String getDisplayName() {
return InspectionGadgetsBundle.message("overly.strong.type.cast.display.name");
}
@Override
@NotNull
protected String buildErrorString(Object... infos) {
final PsiType expectedType = (PsiType)infos[0];
final String typeText = expectedType.getPresentableText();
return InspectionGadgetsBundle.message("overly.strong.type.cast.problem.descriptor", typeText);
}
@Override
@Nullable
public JComponent createOptionsPanel() {
return new SingleCheckboxOptionsPanel(InspectionGadgetsBundle.message("overly.strong.type.cast.ignore.in.matching.instanceof.option"),
this, "ignoreInMatchingInstanceof");
}
@Override
public InspectionGadgetsFix buildFix(Object... infos) {
return new OverlyStrongCastFix();
}
private static class OverlyStrongCastFix extends InspectionGadgetsFix {
@Override
@NotNull
public String getFamilyName() {
return getName();
}
@Override
@NotNull
public String getName() {
return InspectionGadgetsBundle.message("overly.strong.type.cast.weaken.quickfix");
}
@Override
public void doFix(Project project, ProblemDescriptor descriptor) {
final PsiElement castTypeElement = descriptor.getPsiElement();
final PsiTypeCastExpression expression = (PsiTypeCastExpression)castTypeElement.getParent();
if (expression == null) {
return;
}
final PsiType expectedType = ExpectedTypeUtils.findExpectedType(expression, true);
if (expectedType == null) {
return;
}
final PsiExpression operand = expression.getOperand();
if (operand == null) {
return;
}
@NonNls
final String newExpression = '(' + expectedType.getCanonicalText() + ')' + operand.getText();
PsiReplacementUtil.replaceExpressionAndShorten(expression, newExpression);
}
}
@Override
public BaseInspectionVisitor buildVisitor() {
return new OverlyStrongTypeCastVisitor();
}
private class OverlyStrongTypeCastVisitor extends BaseInspectionVisitor {
@Override
public void visitTypeCastExpression(@NotNull PsiTypeCastExpression expression) {
super.visitTypeCastExpression(expression);
final PsiExpression operand = expression.getOperand();
if (operand == null) {
return;
}
final PsiType operandType = operand.getType();
if (operandType == null) {
return;
}
final PsiType type = expression.getType();
if (type == null) {
return;
}
final PsiType expectedType = ExpectedTypeUtils.findExpectedType(expression, true);
if (expectedType == null) {
return;
}
if (expectedType.equals(type)) {
return;
}
final PsiClass resolved = PsiUtil.resolveClassInType(expectedType);
if (resolved != null && !resolved.isPhysical()) {
return;
}
if (expectedType.isAssignableFrom(operandType)) {
//then it's redundant, and caught by the built-in inspection
return;
}
if (isTypeParameter(expectedType)) {
return;
}
if (expectedType instanceof PsiArrayType) {
final PsiArrayType arrayType = (PsiArrayType)expectedType;
final PsiType componentType = arrayType.getDeepComponentType();
if (isTypeParameter(componentType)) {
return;
}
}
if (type instanceof PsiPrimitiveType || expectedType instanceof PsiPrimitiveType) {
return;
}
if (PsiPrimitiveType.getUnboxedType(type) != null || PsiPrimitiveType.getUnboxedType(expectedType) != null) {
return;
}
if (expectedType instanceof PsiClassType) {
final PsiClassType expectedClassType = (PsiClassType)expectedType;
final PsiClassType expectedRawType = expectedClassType.rawType();
if (type.equals(expectedRawType)) {
return;
}
if (type instanceof PsiClassType) {
final PsiClassType classType = (PsiClassType)type;
final PsiClassType rawType = classType.rawType();
if (rawType.equals(expectedRawType)) {
return;
}
}
if (type instanceof PsiArrayType) {
return;
}
}
if (ignoreInMatchingInstanceof && InstanceOfUtils.hasAgreeingInstanceof(expression)) {
return;
}
final PsiTypeElement castTypeElement = expression.getCastType();
if (castTypeElement == null) {
return;
}
if (operand instanceof PsiFunctionalExpression && !LambdaUtil.isFunctionalType(expectedType)) {
return;
}
registerError(castTypeElement, expectedType);
}
private boolean isTypeParameter(PsiType type) {
if (!(type instanceof PsiClassType)) {
return false;
}
final PsiClassType classType = (PsiClassType)type;
final PsiClass aClass = classType.resolve();
return aClass != null && aClass instanceof PsiTypeParameter;
}
}
}
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