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/*
* 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.codeInsight.daemon.impl.quickfix;
import com.intellij.codeInsight.FileModificationService;
import com.intellij.codeInsight.hint.HintManager;
import com.intellij.codeInsight.intention.LowPriorityAction;
import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction;
import com.intellij.codeInsight.template.Template;
import com.intellij.codeInsight.template.TemplateBuilderImpl;
import com.intellij.codeInsight.template.impl.TextExpression;
import com.intellij.icons.AllIcons;
import com.intellij.lang.StdLanguages;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.RangeMarker;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Iconable;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.refactoring.util.RefactoringUtil;
import com.intellij.util.ArrayUtil;
import com.intellij.util.Function;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
import java.util.Arrays;
import java.util.HashSet;
/**
* User: anna
*/
public class DelegateWithDefaultParamValueIntentionAction extends PsiElementBaseIntentionAction implements Iconable, LowPriorityAction {
@Override
public boolean isAvailable(@NotNull Project project, Editor editor, @NotNull PsiElement element) {
final PsiParameter parameter = PsiTreeUtil.getParentOfType(element, PsiParameter.class);
if (parameter != null) {
if (!parameter.getLanguage().isKindOf(StdLanguages.JAVA)) return false;
final PsiElement declarationScope = parameter.getDeclarationScope();
if (declarationScope instanceof PsiMethod) {
final PsiMethod method = (PsiMethod)declarationScope;
final PsiClass containingClass = method.getContainingClass();
if (containingClass != null && !containingClass.isInterface()) {
return containingClass.findMethodBySignature(generateMethodPrototype(method, parameter), false) == null;
}
}
}
return false;
}
@Override
public Icon getIcon(int flags) {
return AllIcons.Actions.RefactoringBulb;
}
private static PsiMethod generateMethodPrototype(PsiMethod method, PsiParameter... params) {
final PsiMethod prototype = (PsiMethod)method.copy();
final PsiCodeBlock body = prototype.getBody();
final PsiCodeBlock emptyBody = JavaPsiFacade.getElementFactory(method.getProject()).createMethodFromText("void foo(){}", prototype).getBody();
assert emptyBody != null;
if (body != null) {
body.replace(emptyBody);
} else {
prototype.getModifierList().setModifierProperty(PsiModifier.ABSTRACT, false);
prototype.addBefore(emptyBody, null);
}
for (int i = params.length - 1; i >= 0; i--) {
PsiParameter param = params[i];
final int parameterIndex = method.getParameterList().getParameterIndex(param);
prototype.getParameterList().getParameters()[parameterIndex].delete();
}
return prototype;
}
@Override
public void invoke(@NotNull final Project project, final Editor editor, @NotNull PsiElement element) throws IncorrectOperationException {
final PsiParameter[] parameters = getParams(element);
if (parameters == null || parameters.length == 0) return;
final PsiMethod method = (PsiMethod)parameters[0].getDeclarationScope();
final PsiMethod methodPrototype = generateMethodPrototype(method, parameters);
final PsiMethod existingMethod = method.getContainingClass().findMethodBySignature(methodPrototype, false);
if (existingMethod != null) {
editor.getCaretModel().moveToOffset(existingMethod.getTextOffset());
HintManager.getInstance().showErrorHint(editor, "Method with the chosen signature already exist");
return;
}
if (!FileModificationService.getInstance().preparePsiElementForWrite(element)) return;
Runnable runnable = new Runnable() {
@Override
public void run() {
final PsiMethod prototype = (PsiMethod)method.getContainingClass().addBefore(methodPrototype, method);
RefactoringUtil.fixJavadocsForParams(prototype, new HashSet<PsiParameter>(Arrays.asList(prototype.getParameterList().getParameters())));
TemplateBuilderImpl builder = new TemplateBuilderImpl(prototype);
PsiCodeBlock body = prototype.getBody();
final String callArgs =
"(" + StringUtil.join(method.getParameterList().getParameters(), new Function<PsiParameter, String>() {
@Override
public String fun(PsiParameter psiParameter) {
if (ArrayUtil.find(parameters, psiParameter) > -1) return "IntelliJIDEARulezzz";
return psiParameter.getName();
}
}, ",") + ");";
final String methodCall;
if (method.getReturnType() == null) {
methodCall = "this";
} else if (method.getReturnType() != PsiType.VOID) {
methodCall = "return " + method.getName();
} else {
methodCall = method.getName();
}
body.add(JavaPsiFacade.getElementFactory(project).createStatementFromText(methodCall + callArgs, method));
body = (PsiCodeBlock)CodeStyleManager.getInstance(project).reformat(body);
final PsiStatement stmt = body.getStatements()[0];
PsiExpression expr = null;
if (stmt instanceof PsiReturnStatement) {
expr = ((PsiReturnStatement)stmt).getReturnValue();
} else if (stmt instanceof PsiExpressionStatement) {
expr = ((PsiExpressionStatement)stmt).getExpression();
}
if (expr instanceof PsiMethodCallExpression) {
PsiMethodCallExpression methodCallExp = (PsiMethodCallExpression)expr;
RangeMarker rangeMarker = editor.getDocument().createRangeMarker(prototype.getTextRange());
for (PsiParameter parameter : parameters) {
final PsiExpression exprToBeDefault =
methodCallExp.getArgumentList().getExpressions()[method.getParameterList().getParameterIndex(parameter)];
builder.replaceElement(exprToBeDefault, new TextExpression(""));
}
Template template = builder.buildTemplate();
editor.getCaretModel().moveToOffset(rangeMarker.getStartOffset());
PsiDocumentManager.getInstance(project).doPostponedOperationsAndUnblockDocument(editor.getDocument());
editor.getDocument().deleteString(rangeMarker.getStartOffset(), rangeMarker.getEndOffset());
rangeMarker.dispose();
CreateFromUsageBaseFix.startTemplate(editor, template, project);
}
}
};
if (startInWriteAction()) {
runnable.run();
} else {
ApplicationManager.getApplication().runWriteAction(runnable);
}
}
@Nullable
protected PsiParameter[] getParams(PsiElement element) {
return new PsiParameter[]{PsiTreeUtil.getParentOfType(element, PsiParameter.class)};
}
@NotNull
@Override
public String getText() {
return "Generate delegated method with default parameter value";
}
@NotNull
@Override
public String getFamilyName() {
return getText();
}
}
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