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/*
* 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.siyeh.ig.performance;
import com.intellij.codeInspection.InspectionManager;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.WriteExternalException;
import com.intellij.psi.*;
import com.intellij.psi.search.searches.ClassInheritorsSearch;
import com.intellij.util.Processor;
import com.intellij.util.Query;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.psiutils.ClassUtils;
import com.siyeh.ig.psiutils.MethodUtils;
import com.siyeh.ig.psiutils.SerializationUtils;
import org.jdom.Element;
import org.jetbrains.annotations.NotNull;
import java.util.concurrent.atomic.AtomicInteger;
public class MethodMayBeStaticInspectionBase extends BaseInspection {
protected static final String IGNORE_DEFAULT_METHODS_ATTR_NAME = "m_ignoreDefaultMethods";
protected static final String ONLY_PRIVATE_OR_FINAL_ATTR_NAME = "m_onlyPrivateOrFinal";
protected static final String IGNORE_EMPTY_METHODS_ATTR_NAME = "m_ignoreEmptyMethods";
protected static final String REPLACE_QUALIFIER_ATTR_NAME = "m_replaceQualifier";
/**
* @noinspection PublicField
*/
public boolean m_onlyPrivateOrFinal = false;
/**
* @noinspection PublicField
*/
public boolean m_ignoreEmptyMethods = true;
public boolean m_ignoreDefaultMethods = true;
public boolean m_replaceQualifier = true;
@Override
@NotNull
public String getDisplayName() {
return InspectionGadgetsBundle.message("method.may.be.static.display.name");
}
@Override
@NotNull
protected String buildErrorString(Object... infos) {
return InspectionGadgetsBundle.message("method.may.be.static.problem.descriptor");
}
@Override
public BaseInspectionVisitor buildVisitor() {
return new MethodCanBeStaticVisitor();
}
@Override
public void writeSettings(@NotNull Element node) throws WriteExternalException {
node.addContent(new Element("option").setAttribute("name", ONLY_PRIVATE_OR_FINAL_ATTR_NAME).setAttribute("value", String.valueOf(m_onlyPrivateOrFinal)));
node.addContent(new Element("option").setAttribute("name", IGNORE_EMPTY_METHODS_ATTR_NAME).setAttribute("value", String.valueOf(
m_ignoreEmptyMethods)));
if (!m_ignoreDefaultMethods) {
node.addContent(new Element("option").setAttribute("name", IGNORE_DEFAULT_METHODS_ATTR_NAME).setAttribute("value", "false"));
}
if (!m_replaceQualifier) {
node.addContent(new Element("option").setAttribute("name", REPLACE_QUALIFIER_ATTR_NAME).setAttribute("value", "false"));
}
}
private class MethodCanBeStaticVisitor extends BaseInspectionVisitor {
@Override
public void visitMethod(@NotNull PsiMethod method) {
super.visitMethod(method);
if (method.hasModifierProperty(PsiModifier.STATIC) ||
method.hasModifierProperty(PsiModifier.ABSTRACT) ||
method.hasModifierProperty(PsiModifier.SYNCHRONIZED) ||
method.hasModifierProperty(PsiModifier.NATIVE)) {
return;
}
if (method.isConstructor() || method.getNameIdentifier() == null) {
return;
}
if (m_ignoreDefaultMethods && method.hasModifierProperty(PsiModifier.DEFAULT)) {
return;
}
if (m_ignoreEmptyMethods && MethodUtils.isEmpty(method)) {
return;
}
final PsiClass containingClass = ClassUtils.getContainingClass(method);
if (containingClass == null) {
return;
}
final Condition<PsiElement>[] addins = InspectionManager.CANT_BE_STATIC_EXTENSION.getExtensions();
for (Condition<PsiElement> addin : addins) {
if (addin.value(method)) {
return;
}
}
final PsiElement scope = containingClass.getScope();
if (!(scope instanceof PsiJavaFile) && !containingClass.hasModifierProperty(PsiModifier.STATIC) && !containingClass.isInterface()) {
return;
}
if (m_onlyPrivateOrFinal && !method.hasModifierProperty(PsiModifier.FINAL) && !method.hasModifierProperty(PsiModifier.PRIVATE)) {
return;
}
if (isExcluded(method) || MethodUtils.hasSuper(method) || MethodUtils.isOverridden(method)) {
return;
}
if (implementsSurprisingInterface(method)) {
return;
}
final MethodReferenceVisitor visitor = new MethodReferenceVisitor(method);
method.accept(visitor);
if (!visitor.areReferencesStaticallyAccessible()) {
return;
}
registerMethodError(method);
}
private boolean implementsSurprisingInterface(final PsiMethod method) {
final PsiClass containingClass = method.getContainingClass();
if (containingClass == null) {
return false;
}
final Query<PsiClass> search = ClassInheritorsSearch.search(containingClass, method.getUseScope(), true, true, false);
final boolean[] result = new boolean[1];
search.forEach(new Processor<PsiClass>() {
AtomicInteger count = new AtomicInteger(0);
@Override
public boolean process(PsiClass subClass) {
if (count.incrementAndGet() > 5) {
result[0] = true;
return false;
}
final PsiReferenceList list = subClass.getImplementsList();
if (list == null) {
return true;
}
final PsiJavaCodeReferenceElement[] referenceElements = list.getReferenceElements();
for (PsiJavaCodeReferenceElement referenceElement : referenceElements) {
final PsiElement target = referenceElement.resolve();
if (!(target instanceof PsiClass)) {
result[0] = true;
return false;
}
final PsiClass aClass = (PsiClass)target;
if (!aClass.isInterface()) {
result[0] = true;
return false;
}
if (aClass.findMethodBySignature(method, true) != null) {
result[0] = true;
return false;
}
}
return true;
}
});
return result[0];
}
private boolean isExcluded(PsiMethod method) {
return SerializationUtils.isWriteObject(method) || SerializationUtils.isReadObject(method) ||
SerializationUtils.isWriteReplace(method) || SerializationUtils.isReadResolve(method);
}
}
}
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