| /* |
| * 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.ipp.constant; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.ConstantEvaluationOverflowException; |
| import com.intellij.psi.util.PsiUtil; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| |
| import static com.intellij.psi.CommonClassNames.JAVA_LANG_STRING; |
| |
| class ConstantExpressionPredicate implements PsiElementPredicate { |
| |
| public boolean satisfiedBy(PsiElement element) { |
| if (!(element instanceof PsiPolyadicExpression)) { |
| return false; |
| } |
| if (element instanceof PsiLiteralExpression || element instanceof PsiClassObjectAccessExpression) { |
| return false; |
| } |
| final PsiPolyadicExpression expression = (PsiPolyadicExpression)element; |
| final PsiType expressionType = expression.getType(); |
| if (expressionType == null || expressionType.equalsToText(JAVA_LANG_STRING)) { |
| // intention disabled for string concatenations because of performance issues on |
| // relatively common large string expressions. |
| return false; |
| } |
| final PsiExpression[] operands = expression.getOperands(); |
| for (PsiExpression operand : operands) { |
| if (operand == null) { |
| return false; |
| } |
| final PsiType type = operand.getType(); |
| if (type == null || type.equalsToText(JAVA_LANG_STRING)) { |
| return false; |
| } |
| } |
| if (!PsiUtil.isConstantExpression(expression)) { |
| return false; |
| } |
| try { |
| final Object value = ExpressionUtils.computeConstantExpression(expression, true); |
| if (value == null) { |
| return false; |
| } |
| } |
| catch (ConstantEvaluationOverflowException ignore) { |
| return false; |
| } |
| final PsiElement parent = element.getParent(); |
| return !(parent instanceof PsiExpression) || !PsiUtil.isConstantExpression((PsiExpression)parent); |
| } |
| } |