| /* |
| * Copyright 2011 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.types; |
| |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.*; |
| import com.intellij.psi.codeStyle.JavaCodeStyleManager; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.psi.util.PsiUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.ipp.base.Intention; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public class InferLambdaParameterTypeIntention extends Intention { |
| private static final Logger LOG = Logger.getInstance("#" + InferLambdaParameterTypeIntention.class.getName()); |
| private String myInferredTypesText; |
| |
| @NotNull |
| @Override |
| protected PsiElementPredicate getElementPredicate() { |
| return new LambdaParametersPredicate(); |
| } |
| |
| @NotNull |
| @Override |
| public String getText() { |
| return "Expand lambda to " + myInferredTypesText + " -> {...}"; |
| } |
| |
| @Override |
| protected void processIntention(@NotNull PsiElement element) throws IncorrectOperationException { |
| final PsiLambdaExpression lambdaExpression = PsiTreeUtil.getParentOfType(element, PsiLambdaExpression.class); |
| LOG.assertTrue(lambdaExpression != null); |
| final PsiType functionalInterfaceType = lambdaExpression.getFunctionalInterfaceType(); |
| final String buf = getInferredTypes(functionalInterfaceType, lambdaExpression, true); |
| final Project project = element.getProject(); |
| final PsiMethod methodFromText = JavaPsiFacade.getElementFactory(project).createMethodFromText("void foo" + buf, element); |
| JavaCodeStyleManager.getInstance(project).shortenClassReferences(lambdaExpression.getParameterList().replace(methodFromText.getParameterList())); |
| } |
| |
| @Nullable |
| private static String getInferredTypes(PsiType functionalInterfaceType, final PsiLambdaExpression lambdaExpression, boolean useFQN) { |
| final PsiClassType.ClassResolveResult resolveResult = PsiUtil.resolveGenericsClassInType(functionalInterfaceType); |
| final StringBuilder buf = new StringBuilder(); |
| buf.append("("); |
| final PsiMethod interfaceMethod = LambdaUtil.getFunctionalInterfaceMethod(functionalInterfaceType); |
| LOG.assertTrue(interfaceMethod != null); |
| final PsiParameter[] parameters = interfaceMethod.getParameterList().getParameters(); |
| final PsiParameter[] lambdaParameters = lambdaExpression.getParameterList().getParameters(); |
| if (parameters.length != lambdaParameters.length) return null; |
| for (int i = 0; i < parameters.length; i++) { |
| PsiParameter parameter = parameters[i]; |
| final PsiType psiType = LambdaUtil.getSubstitutor(interfaceMethod, resolveResult).substitute(parameter.getType()); |
| if (psiType != null) { |
| buf.append(useFQN ? psiType.getCanonicalText() : psiType.getPresentableText()).append(" ").append(lambdaParameters[i].getName()); |
| } |
| else { |
| buf.append(lambdaParameters[i].getName()); |
| } |
| if (i < parameters.length - 1) { |
| buf.append(", "); |
| } |
| } |
| buf.append(")"); |
| return buf.toString(); |
| } |
| |
| |
| private class LambdaParametersPredicate implements PsiElementPredicate { |
| @Override |
| public boolean satisfiedBy(PsiElement element) { |
| final PsiLambdaExpression lambdaExpression = PsiTreeUtil.getParentOfType(element, PsiLambdaExpression.class); |
| if (lambdaExpression != null) { |
| PsiParameter[] parameters = lambdaExpression.getParameterList().getParameters(); |
| if (parameters.length == 0) return false; |
| for (PsiParameter parameter : parameters) { |
| if (parameter.getTypeElement() != null) { |
| return false; |
| } |
| } |
| if (PsiTreeUtil.isAncestor(lambdaExpression.getParameterList(), element, false)) { |
| final PsiType functionalInterfaceType = lambdaExpression.getFunctionalInterfaceType(); |
| if (functionalInterfaceType != null && LambdaUtil.getFunctionalInterfaceMethod(functionalInterfaceType) != null && LambdaUtil.isLambdaFullyInferred(lambdaExpression, functionalInterfaceType)) { |
| myInferredTypesText = getInferredTypes(functionalInterfaceType, lambdaExpression, false); |
| return myInferredTypesText != null; |
| } |
| } |
| } |
| return false; |
| } |
| } |
| } |