/*
* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.oracle.truffle.dsl.processor.java.transform;
import static com.oracle.truffle.dsl.processor.java.ElementUtils.modifiers;
import static javax.lang.model.element.Modifier.FINAL;
import static javax.lang.model.element.Modifier.PRIVATE;
import static javax.lang.model.element.Modifier.STATIC;
import java.io.Serializable;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.StringTokenizer;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.DeclaredType;
import com.oracle.truffle.dsl.processor.java.ElementUtils;
import com.oracle.truffle.dsl.processor.java.model.CodeAnnotationMirror;
import com.oracle.truffle.dsl.processor.java.model.CodeAnnotationValue;
import com.oracle.truffle.dsl.processor.java.model.CodeElementScanner;
import com.oracle.truffle.dsl.processor.java.model.CodeExecutableElement;
import com.oracle.truffle.dsl.processor.java.model.CodeTree;
import com.oracle.truffle.dsl.processor.java.model.CodeTypeElement;
import com.oracle.truffle.dsl.processor.java.model.CodeVariableElement;
public class FixWarningsVisitor extends CodeElementScanner<Void, Void> {
private final Set<String> symbolsUsed = new HashSet<>();
private final ProcessingEnvironment processingEnv;
private final DeclaredType unusedAnnotation;
private final DeclaredType overrideType;
public FixWarningsVisitor(ProcessingEnvironment processingEnv, DeclaredType unusedAnnotation, DeclaredType overrideType) {
this.processingEnv = processingEnv;
this.unusedAnnotation = unusedAnnotation;
this.overrideType = overrideType;
}
@Override
public Void visitType(CodeTypeElement e, Void p) {
List<TypeElement> superTypes = ElementUtils.getSuperTypes(e);
for (TypeElement type : superTypes) {
String qualifiedName = ElementUtils.getQualifiedName(type);
if (qualifiedName.equals(Serializable.class.getCanonicalName())) {
if (!e.containsField("serialVersionUID")) {
e.add(new CodeVariableElement(modifiers(PRIVATE, STATIC, FINAL), ElementUtils.getType(processingEnv, long.class), "serialVersionUID", "1L"));
}
break;
}
}
return super.visitType(e, p);
}
@Override
public Void visitExecutable(CodeExecutableElement e, Void p) {
if (e.getParameters().isEmpty()) {
return null;
} else if (e.getModifiers().contains(Modifier.ABSTRACT)) {
return null;
} else if (containsOverride(e)) {
return null;
}
symbolsUsed.clear();
super.visitExecutable(e, p);
for (VariableElement parameter : e.getParameters()) {
if (!symbolsUsed.contains(parameter.getSimpleName().toString())) {
e.getAnnotationMirrors().add(createUnusedAnnotationMirror());
break;
}
}
return null;
}
private boolean containsOverride(CodeExecutableElement e) {
for (AnnotationMirror mirror : e.getAnnotationMirrors()) {
if (ElementUtils.typeEquals(overrideType, mirror.getAnnotationType())) {
return true;
}
}
return false;
}
private CodeAnnotationMirror createUnusedAnnotationMirror() {
CodeAnnotationMirror mirror = new CodeAnnotationMirror(unusedAnnotation);
mirror.setElementValue(mirror.findExecutableElement("value"), new CodeAnnotationValue("unused"));
return mirror;
}
@Override
public void visitTree(CodeTree e, Void p, Element enclosingElement) {
if (e.getString() != null) {
computeSymbols(e.getString());
}
super.visitTree(e, p, enclosingElement);
}
private void computeSymbols(String s) {
// TODO there should not be any need for a StringTokenizer if we have a real AST for
// method bodies. Also the current solution is not perfect. What if one token
// is spread across multiple CodeTree instances? But for now that works.
StringTokenizer tokenizer = new StringTokenizer(s, ".= :,()[];{}\"\"'' ", false);
while (tokenizer.hasMoreElements()) {
String token = tokenizer.nextToken().trim();
if (token.length() > 0) {
symbolsUsed.add(token);
}
}
}
}