| /* |
| * 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.concatenation; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.IntentionPowerPackBundle; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ig.psiutils.ParenthesesUtils; |
| import com.siyeh.ipp.base.MutablyNamedIntention; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import com.siyeh.ipp.psiutils.ConcatenationUtils; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class ReplaceConcatenationWithStringBufferIntention extends MutablyNamedIntention { |
| |
| @Override |
| protected String getTextForElement(PsiElement element) { |
| if (PsiUtil.isLanguageLevel5OrHigher(element)) { |
| return IntentionPowerPackBundle.message( |
| "replace.concatenation.with.string.builder.intention.name"); |
| } |
| else { |
| return IntentionPowerPackBundle.message( |
| "replace.concatenation.with.string.buffer.intention.name"); |
| } |
| } |
| |
| @Override |
| @NotNull |
| public PsiElementPredicate getElementPredicate() { |
| return new SimpleStringConcatenationPredicate(true); |
| } |
| |
| @Override |
| public void processIntention(@NotNull PsiElement element) throws IncorrectOperationException { |
| PsiPolyadicExpression expression = (PsiPolyadicExpression)element; |
| PsiElement parent = expression.getParent(); |
| while (ConcatenationUtils.isConcatenation(parent)) { |
| expression = (PsiPolyadicExpression)parent; |
| parent = expression.getParent(); |
| } |
| @NonNls final StringBuilder newExpression = new StringBuilder(); |
| if (isPartOfStringBufferAppend(expression)) { |
| final PsiMethodCallExpression methodCallExpression = (PsiMethodCallExpression)parent.getParent(); |
| assert methodCallExpression != null; |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| final PsiExpression qualifierExpression = methodExpression.getQualifierExpression(); |
| if (qualifierExpression != null) { |
| final String qualifierText = qualifierExpression.getText(); |
| newExpression.append(qualifierText); |
| } |
| turnExpressionIntoChainedAppends(expression, newExpression); |
| PsiReplacementUtil.replaceExpression(methodCallExpression, newExpression.toString()); |
| } |
| else { |
| if (!PsiUtil.isLanguageLevel5OrHigher(expression)) { |
| newExpression.append("new StringBuffer()"); |
| } |
| else { |
| newExpression.append("new StringBuilder()"); |
| } |
| turnExpressionIntoChainedAppends(expression, newExpression); |
| newExpression.append(".toString()"); |
| PsiReplacementUtil.replaceExpression(expression, newExpression.toString()); |
| } |
| } |
| |
| private static boolean isPartOfStringBufferAppend(PsiExpression expression) { |
| PsiElement parent = expression.getParent(); |
| if (!(parent instanceof PsiExpressionList)) { |
| return false; |
| } |
| parent = parent.getParent(); |
| if (!(parent instanceof PsiMethodCallExpression)) { |
| return false; |
| } |
| final PsiMethodCallExpression methodCall = (PsiMethodCallExpression)parent; |
| final PsiReferenceExpression methodExpression = methodCall.getMethodExpression(); |
| final PsiType type = methodExpression.getType(); |
| if (type == null) { |
| return false; |
| } |
| final String className = type.getCanonicalText(); |
| if (!CommonClassNames.JAVA_LANG_STRING_BUFFER.equals(className) && !CommonClassNames.JAVA_LANG_STRING_BUILDER.equals(className)) { |
| return false; |
| } |
| @NonNls final String methodName = methodExpression.getReferenceName(); |
| return "append".equals(methodName); |
| } |
| |
| private static void turnExpressionIntoChainedAppends(PsiExpression expression, @NonNls StringBuilder result) { |
| if (expression instanceof PsiPolyadicExpression) { |
| final PsiPolyadicExpression concatenation = (PsiPolyadicExpression)expression; |
| final PsiType type = concatenation.getType(); |
| if (type != null && !type.equalsToText(CommonClassNames.JAVA_LANG_STRING)) { |
| result.append(".append(").append(concatenation.getText()).append(')'); |
| return; |
| } |
| final PsiExpression[] operands = concatenation.getOperands(); |
| final PsiType startType = operands[0].getType(); |
| if (startType == null || startType.equalsToText(CommonClassNames.JAVA_LANG_STRING)) { |
| for (PsiExpression operand : operands) { |
| turnExpressionIntoChainedAppends(operand, result); |
| } |
| return; |
| } |
| final StringBuilder newExpressionText = new StringBuilder(operands[0].getText()); |
| boolean string = false; |
| for (int i = 1; i < operands.length; i++) { |
| final PsiExpression operand = operands[i]; |
| if (!string) { |
| final PsiType operandType = operand.getType(); |
| if (operandType == null || operandType.equalsToText(CommonClassNames.JAVA_LANG_STRING)) { |
| final PsiElementFactory factory = JavaPsiFacade.getElementFactory(expression.getProject()); |
| final PsiExpression newExpression = factory.createExpressionFromText(newExpressionText.toString(), expression); |
| turnExpressionIntoChainedAppends(newExpression, result); |
| turnExpressionIntoChainedAppends(operand, result); |
| string = true; |
| } |
| newExpressionText.append('+').append(operand.getText()); |
| } else { |
| turnExpressionIntoChainedAppends(operand, result); |
| } |
| } |
| } |
| else { |
| final PsiExpression strippedExpression = ParenthesesUtils.stripParentheses(expression); |
| result.append(".append("); |
| if (strippedExpression != null) { |
| result.append(strippedExpression.getText()); |
| } |
| result.append(')'); |
| } |
| } |
| } |