Java tutorial
/* * Copyright 2000-2011 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.refactoring.changeSignature; import com.intellij.codeInsight.TargetElementUtil; import com.intellij.ide.util.SuperMethodWarningUtil; import com.intellij.openapi.actionSystem.DataContext; import com.intellij.openapi.actionSystem.LangDataKeys; import com.intellij.openapi.actionSystem.PlatformDataKeys; import com.intellij.openapi.editor.Editor; import com.intellij.openapi.editor.ScrollType; import com.intellij.openapi.project.Project; import com.intellij.openapi.ui.DialogWrapper; import com.intellij.psi.*; import com.intellij.psi.util.PsiTreeUtil; import com.intellij.refactoring.HelpID; import com.intellij.refactoring.RefactoringBundle; import com.intellij.refactoring.changeClassSignature.ChangeClassSignatureDialog; import com.intellij.refactoring.util.CommonRefactoringUtil; import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable; public class JavaChangeSignatureHandler implements ChangeSignatureHandler { public void invoke(@NotNull Project project, Editor editor, PsiFile file, DataContext dataContext) { editor.getScrollingModel().scrollToCaret(ScrollType.MAKE_VISIBLE); PsiElement element = findTargetMember(file, editor); if (element == null) { element = LangDataKeys.PSI_ELEMENT.getData(dataContext); } invokeOnElement(project, editor, element); } private static void invokeOnElement(Project project, Editor editor, PsiElement element) { if (element instanceof PsiMethod) { final ChangeSignatureGestureDetector detector = ChangeSignatureGestureDetector.getInstance(project); final PsiIdentifier nameIdentifier = ((PsiMethod) element).getNameIdentifier(); if (nameIdentifier != null && detector.isChangeSignatureAvailable(element)) { detector.changeSignature(element.getContainingFile(), false); return; } invoke((PsiMethod) element, project, editor); } else if (element instanceof PsiClass) { invoke((PsiClass) element, editor); } else { String message = RefactoringBundle.getCannotRefactorMessage( RefactoringBundle.message("error.wrong.caret.position.method.or.class.name")); CommonRefactoringUtil.showErrorHint(project, editor, message, REFACTORING_NAME, HelpID.CHANGE_SIGNATURE); } } public void invoke(@NotNull final Project project, @NotNull final PsiElement[] elements, @Nullable final DataContext dataContext) { if (elements.length != 1) return; Editor editor = dataContext != null ? PlatformDataKeys.EDITOR.getData(dataContext) : null; invokeOnElement(project, editor, elements[0]); } @Nullable @Override public String getTargetNotFoundMessage() { return RefactoringBundle.message("error.wrong.caret.position.method.or.class.name"); } private static void invoke(final PsiMethod method, final Project project, @Nullable final Editor editor) { PsiMethod newMethod = SuperMethodWarningUtil.checkSuperMethod(method, RefactoringBundle.message("to.refactor")); if (newMethod == null) return; if (!newMethod.equals(method)) { ChangeSignatureUtil.invokeChangeSignatureOn(newMethod, project); return; } if (!CommonRefactoringUtil.checkReadOnlyStatus(project, method)) return; final PsiClass containingClass = method.getContainingClass(); final PsiReferenceExpression refExpr = editor != null ? TargetElementUtil.findReferenceExpression(editor) : null; final boolean allowDelegation = containingClass != null && !containingClass.isInterface(); final DialogWrapper dialog = new JavaChangeSignatureDialog(project, method, allowDelegation, refExpr); dialog.show(); } private static void invoke(final PsiClass aClass, Editor editor) { final PsiTypeParameterList typeParameterList = aClass.getTypeParameterList(); Project project = aClass.getProject(); if (typeParameterList == null) { final String message = RefactoringBundle .getCannotRefactorMessage(RefactoringBundle.message("changeClassSignature.no.type.parameters")); CommonRefactoringUtil.showErrorHint(project, editor, message, REFACTORING_NAME, HelpID.CHANGE_CLASS_SIGNATURE); return; } if (!CommonRefactoringUtil.checkReadOnlyStatus(project, aClass)) return; ChangeClassSignatureDialog dialog = new ChangeClassSignatureDialog(aClass, true); //if (!ApplicationManager.getApplication().isUnitTestMode()){ dialog.show(); //}else { // dialog.showAndGetOk() //} } @Nullable public PsiElement findTargetMember(PsiFile file, Editor editor) { PsiElement element = file.findElementAt(editor.getCaretModel().getOffset()); return findTargetMember(element); } public PsiElement findTargetMember(PsiElement element) { if (PsiTreeUtil.getParentOfType(element, PsiParameterList.class) != null) { return PsiTreeUtil.getParentOfType(element, PsiMethod.class); } final PsiTypeParameterList typeParameterList = PsiTreeUtil.getParentOfType(element, PsiTypeParameterList.class); if (typeParameterList != null) { return PsiTreeUtil.getParentOfType(typeParameterList, PsiMember.class); } final PsiElement elementParent = element.getParent(); if (elementParent instanceof PsiMethod && ((PsiMethod) elementParent).getNameIdentifier() == element) { final PsiClass containingClass = ((PsiMethod) elementParent).getContainingClass(); if (containingClass != null && containingClass.isAnnotationType()) { return null; } return elementParent; } if (elementParent instanceof PsiClass && ((PsiClass) elementParent).getNameIdentifier() == element) { if (((PsiClass) elementParent).isAnnotationType()) { return null; } return elementParent; } final PsiCallExpression expression = PsiTreeUtil.getParentOfType(element, PsiCallExpression.class); if (expression != null) { final PsiExpression qualifierExpression; if (expression instanceof PsiMethodCallExpression) { qualifierExpression = ((PsiMethodCallExpression) expression).getMethodExpression() .getQualifierExpression(); } else if (expression instanceof PsiNewExpression) { qualifierExpression = ((PsiNewExpression) expression).getQualifier(); } else { qualifierExpression = null; } if (PsiTreeUtil.isAncestor(qualifierExpression, element, false)) { final PsiExpressionList expressionList = PsiTreeUtil.getParentOfType(qualifierExpression, PsiExpressionList.class); if (expressionList != null) { final PsiElement parent = expressionList.getParent(); if (parent instanceof PsiCallExpression) { return ((PsiCallExpression) parent).resolveMethod(); } } } else { return expression.resolveMethod(); } } final PsiReferenceParameterList referenceParameterList = PsiTreeUtil.getParentOfType(element, PsiReferenceParameterList.class); if (referenceParameterList != null) { final PsiJavaCodeReferenceElement referenceElement = PsiTreeUtil.getParentOfType(referenceParameterList, PsiJavaCodeReferenceElement.class); if (referenceElement != null) { final PsiElement resolved = referenceElement.resolve(); if (resolved instanceof PsiClass) { return resolved; } else if (resolved instanceof PsiMethod) { return resolved; } } } return null; } }