| /* |
| * 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.numeric; |
| |
| import com.intellij.codeInspection.ui.SingleCheckboxOptionsPanel; |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ClassUtils; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import com.siyeh.ig.psiutils.MethodUtils; |
| import com.siyeh.ig.psiutils.TypeUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| import javax.swing.*; |
| |
| public class CastThatLosesPrecisionInspection extends BaseInspection { |
| |
| @SuppressWarnings({"PublicField"}) |
| public boolean ignoreIntegerCharCasts = false; |
| |
| @Override |
| @NotNull |
| public String getID() { |
| return "NumericCastThatLosesPrecision"; |
| } |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "cast.that.loses.precision.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| final PsiType operandType = (PsiType)infos[0]; |
| return InspectionGadgetsBundle.message("cast.that.loses.precision.problem.descriptor", operandType.getPresentableText()); |
| } |
| |
| @Override |
| public JComponent createOptionsPanel() { |
| return new SingleCheckboxOptionsPanel(InspectionGadgetsBundle.message("cast.that.loses.precision.option"), |
| this, "ignoreIntegerCharCasts"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new CastThatLosesPrecisionVisitor(); |
| } |
| |
| private class CastThatLosesPrecisionVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitTypeCastExpression(@NotNull PsiTypeCastExpression expression) { |
| final PsiType castType = expression.getType(); |
| if (!ClassUtils.isPrimitiveNumericType(castType)) { |
| return; |
| } |
| final PsiExpression operand = expression.getOperand(); |
| if (operand == null) { |
| return; |
| } |
| final PsiType operandType = operand.getType(); |
| if (!ClassUtils.isPrimitiveNumericType(operandType) || !TypeUtils.isNarrowingConversion(operandType, castType)) { |
| return; |
| } |
| if (ignoreIntegerCharCasts) { |
| if (PsiType.INT.equals(operandType) && PsiType.CHAR.equals(castType)) { |
| return; |
| } |
| } |
| if (PsiType.LONG.equals(operandType) && PsiType.INT.equals(castType)) { |
| final PsiMethod method = PsiTreeUtil.getParentOfType(expression, PsiMethod.class, true, PsiClass.class); |
| if (MethodUtils.isHashCode(method)) { |
| return; |
| } |
| } |
| Object result = ExpressionUtils.computeConstantExpression(operand); |
| if (result instanceof Character) { |
| result = Integer.valueOf(((Character)result).charValue()); |
| } |
| if (result instanceof Number) { |
| final Number number = (Number)result; |
| if (valueIsContainableInType(number, castType)) { |
| return; |
| } |
| } |
| final PsiTypeElement castTypeElement = expression.getCastType(); |
| if (castTypeElement == null) { |
| return; |
| } |
| registerError(castTypeElement, operandType); |
| } |
| |
| private boolean valueIsContainableInType(Number value, PsiType type) { |
| final long longValue = value.longValue(); |
| final double doubleValue = value.doubleValue(); |
| if (PsiType.BYTE.equals(type)) { |
| return longValue >= (long)Byte.MIN_VALUE && |
| longValue <= (long)Byte.MAX_VALUE && |
| doubleValue >= (double)Byte.MIN_VALUE && |
| doubleValue <= (double)Byte.MAX_VALUE; |
| } |
| else if (PsiType.CHAR.equals(type)) { |
| return longValue >= (long)Character.MIN_VALUE && |
| longValue <= (long)Character.MAX_VALUE && |
| doubleValue >= (double)Character.MIN_VALUE && |
| doubleValue <= (double)Character.MAX_VALUE; |
| } |
| else if (PsiType.SHORT.equals(type)) { |
| return longValue >= (long)Short.MIN_VALUE && |
| longValue <= (long)Short.MAX_VALUE && |
| doubleValue >= (double)Short.MIN_VALUE && |
| doubleValue <= (double)Short.MAX_VALUE; |
| } |
| else if (PsiType.INT.equals(type)) { |
| return longValue >= (long)Integer.MIN_VALUE && |
| longValue <= (long)Integer.MAX_VALUE && |
| doubleValue >= (double)Integer.MIN_VALUE && |
| doubleValue <= (double)Integer.MAX_VALUE; |
| } |
| else if (PsiType.LONG.equals(type)) { |
| return longValue >= Long.MIN_VALUE && |
| longValue <= Long.MAX_VALUE && |
| doubleValue >= (double)Long.MIN_VALUE && |
| doubleValue <= (double)Long.MAX_VALUE; |
| } |
| else if (PsiType.FLOAT.equals(type)) { |
| return doubleValue == value.floatValue(); |
| } |
| else if (PsiType.DOUBLE.equals(type)) { |
| return true; |
| } |
| return false; |
| } |
| } |
| } |