| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * 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.intellij.codeInspection.util; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiUtil; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.Nullable; |
| |
| public class ChangeToAppendUtil { |
| @Nullable |
| public static PsiExpression buildAppendExpression(PsiExpression appendable, PsiExpression concatenation) { |
| if (concatenation == null) return null; |
| final PsiType type = appendable.getType(); |
| if (type == null) return null; |
| final StringBuilder result = |
| buildAppendExpression(concatenation, type.equalsToText("java.lang.Appendable"), new StringBuilder(appendable.getText())); |
| if (result == null) return null; |
| final PsiElementFactory factory = JavaPsiFacade.getElementFactory(appendable.getProject()); |
| return factory.createExpressionFromText(result.toString(), appendable); |
| } |
| |
| @Nullable |
| public static StringBuilder buildAppendExpression(PsiExpression concatenation, boolean useStringValueOf, @NonNls StringBuilder out) { |
| final PsiType type = concatenation.getType(); |
| if (concatenation instanceof PsiPolyadicExpression && type != null && type.equalsToText(CommonClassNames.JAVA_LANG_STRING)) { |
| final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)concatenation; |
| final PsiExpression[] operands = polyadicExpression.getOperands(); |
| boolean isConstant = true; |
| boolean isString = false; |
| final StringBuilder builder = new StringBuilder(); |
| for (PsiExpression operand : operands) { |
| if (isConstant && PsiUtil.isConstantExpression(operand)) { |
| if (builder.length() != 0) { |
| builder.append('+'); |
| } |
| final PsiType operandType = operand.getType(); |
| if (operandType != null && operandType.equalsToText(CommonClassNames.JAVA_LANG_STRING)) { |
| isString = true; |
| } |
| builder.append(operand.getText()); |
| } |
| else { |
| isConstant = false; |
| if (builder.length() != 0) { |
| append(builder, useStringValueOf && !isString, out); |
| builder.setLength(0); |
| } |
| buildAppendExpression(operand, useStringValueOf, out); |
| } |
| } |
| if (builder.length() != 0) { |
| append(builder, false, out); |
| } |
| } |
| else if (concatenation instanceof PsiParenthesizedExpression) { |
| final PsiParenthesizedExpression parenthesizedExpression = (PsiParenthesizedExpression)concatenation; |
| final PsiExpression expression = parenthesizedExpression.getExpression(); |
| if (expression != null) { |
| return buildAppendExpression(expression, useStringValueOf, out); |
| } |
| } |
| else { |
| append(concatenation.getText(), useStringValueOf && (type == null || !type.equalsToText(CommonClassNames.JAVA_LANG_STRING)), out); |
| } |
| return out; |
| } |
| |
| private static void append(CharSequence text, boolean useStringValueOf, StringBuilder out) { |
| out.append(".append("); |
| if (useStringValueOf) { |
| out.append("String.valueOf(").append(text).append(')'); |
| } |
| else { |
| out.append(text); |
| } |
| out.append(')'); |
| } |
| } |