| /* |
| * Copyright 2003-2012 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.bugs; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.HardcodedMethodConstants; |
| import org.jetbrains.annotations.NotNull; |
| |
| class ParameterClassCheckVisitor extends JavaRecursiveElementVisitor { |
| |
| private final PsiParameter parameter; |
| |
| private boolean checked = false; |
| |
| ParameterClassCheckVisitor(@NotNull PsiParameter parameter) { |
| super(); |
| this.parameter = parameter; |
| } |
| |
| @Override |
| public void visitElement(@NotNull PsiElement element) { |
| if (!checked) { |
| super.visitElement(element); |
| } |
| } |
| |
| @Override |
| public void visitMethodCallExpression( |
| @NotNull PsiMethodCallExpression expression) { |
| if (checked) { |
| return; |
| } |
| super.visitMethodCallExpression(expression); |
| if (isGetClassCall(expression) || isGetInstanceCall(expression) || isCallToSuperEquals(expression)) { |
| checked = true; |
| } |
| } |
| |
| private boolean isGetInstanceCall(PsiMethodCallExpression methodCallExpression) { |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| final String methodName = methodExpression.getReferenceName(); |
| if (!HardcodedMethodConstants.IS_INSTANCE.equals(methodName)) { |
| return false; |
| } |
| final PsiMethod method = methodCallExpression.resolveMethod(); |
| if (method == null) { |
| return false; |
| } |
| final PsiClass aClass = method.getContainingClass(); |
| if (aClass == null) { |
| return false; |
| } |
| final String className = aClass.getQualifiedName(); |
| if (!CommonClassNames.JAVA_LANG_CLASS.equals(className)) { |
| return false; |
| } |
| final PsiExpressionList argumentList = methodCallExpression.getArgumentList(); |
| final PsiExpression[] expressions = argumentList.getExpressions(); |
| if (expressions.length != 1) { |
| return false; |
| } |
| final PsiExpression expression = expressions[0]; |
| return isParameterReference(expression); |
| } |
| |
| private boolean isGetClassCall(PsiMethodCallExpression methodCallExpression) { |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| final String methodName = methodExpression.getReferenceName(); |
| if (!HardcodedMethodConstants.GET_CLASS.equals(methodName)) { |
| return false; |
| } |
| final PsiExpressionList argumentList = methodCallExpression.getArgumentList(); |
| final PsiExpression[] arguments = argumentList.getExpressions(); |
| if (arguments.length != 0) { |
| return false; |
| } |
| final PsiMethod method = methodCallExpression.resolveMethod(); |
| if (method == null) { |
| return false; |
| } |
| final PsiClass aClass = method.getContainingClass(); |
| if (aClass == null) { |
| return false; |
| } |
| final String className = aClass.getQualifiedName(); |
| if (!CommonClassNames.JAVA_LANG_OBJECT.equals(className)) { |
| return false; |
| } |
| final PsiExpression qualifier = methodExpression.getQualifierExpression(); |
| return isParameterReference(qualifier); |
| } |
| |
| private boolean isCallToSuperEquals(PsiMethodCallExpression methodCallExpression) { |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| final PsiExpression qualifierExpression = methodExpression.getQualifierExpression(); |
| if (!(qualifierExpression instanceof PsiSuperExpression)) { |
| return false; |
| } |
| final String name = methodExpression.getReferenceName(); |
| if (!HardcodedMethodConstants.EQUALS.equals(name)) { |
| return false; |
| } |
| final PsiExpressionList argumentList = methodCallExpression.getArgumentList(); |
| final PsiExpression[] arguments = argumentList.getExpressions(); |
| if (arguments.length != 1) { |
| return false; |
| } |
| final PsiExpression argument = arguments[0]; |
| if (!(argument instanceof PsiReferenceExpression)) { |
| return false; |
| } |
| final PsiReferenceExpression referenceExpression = (PsiReferenceExpression)argument; |
| final PsiElement target = referenceExpression.resolve(); |
| return parameter.equals(target); |
| } |
| |
| @Override |
| public void visitInstanceOfExpression(@NotNull PsiInstanceOfExpression expression) { |
| if (checked) { |
| return; |
| } |
| super.visitInstanceOfExpression(expression); |
| final PsiExpression operand = expression.getOperand(); |
| if (isParameterReference(operand)) { |
| checked = true; |
| } |
| } |
| |
| @Override |
| public void visitTypeCastExpression( |
| PsiTypeCastExpression expression) { |
| if (checked) { |
| return; |
| } |
| super.visitTypeCastExpression(expression); |
| final PsiExpression operand = expression.getOperand(); |
| if (!isParameterReference(operand)) { |
| return; |
| } |
| final PsiTryStatement statement = PsiTreeUtil.getParentOfType(expression, PsiTryStatement.class); |
| if (statement == null) { |
| return; |
| } |
| final PsiParameter[] parameters = statement.getCatchBlockParameters(); |
| if (parameters.length < 2) { |
| return; |
| } |
| boolean nullPointerExceptionFound = false; |
| boolean classCastExceptionFound = false; |
| for (PsiParameter parameter : parameters) { |
| final PsiType type = parameter.getType(); |
| if (type.equalsToText("java.lang.NullPointerException")) { |
| nullPointerExceptionFound = true; |
| if (classCastExceptionFound) { |
| break; |
| } |
| } |
| else if (type.equalsToText("java.lang.ClassCastException")) { |
| classCastExceptionFound = true; |
| if (nullPointerExceptionFound) { |
| break; |
| } |
| } |
| } |
| if (classCastExceptionFound && nullPointerExceptionFound) { |
| checked = true; |
| } |
| } |
| |
| private boolean isParameterReference(PsiExpression operand) { |
| if (operand == null) { |
| return false; |
| } |
| if (!(operand instanceof PsiReferenceExpression)) { |
| return false; |
| } |
| final PsiReferenceExpression expression = (PsiReferenceExpression)operand; |
| final PsiElement referent = expression.resolve(); |
| return referent != null && referent.equals(parameter); |
| } |
| |
| public boolean isChecked() { |
| return checked; |
| } |
| } |