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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.turbine.bytecode;
import com.google.common.collect.ImmutableList;
import com.google.turbine.bytecode.Attribute.AnnotationDefault;
import com.google.turbine.bytecode.Attribute.ConstantValue;
import com.google.turbine.bytecode.Attribute.ExceptionsAttribute;
import com.google.turbine.bytecode.Attribute.InnerClasses;
import com.google.turbine.bytecode.Attribute.MethodParameters;
import com.google.turbine.bytecode.Attribute.Signature;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo;
import com.google.turbine.bytecode.ClassFile.TypeAnnotationInfo;
import java.util.ArrayList;
import java.util.List;
/** Lower information in {@link ClassFile} structures to attributes. */
public final class LowerAttributes {
/** Collects the {@link Attribute}s for a {@link ClassFile}. */
static List<Attribute> classAttributes(ClassFile classfile) {
List<Attribute> attributes = new ArrayList<>();
if (!classfile.innerClasses().isEmpty()) {
attributes.add(new InnerClasses(classfile.innerClasses()));
}
addAllAnnotations(attributes, classfile.annotations());
addAllTypeAnnotations(attributes, classfile.typeAnnotations());
if (classfile.signature() != null) {
attributes.add(new Signature(classfile.signature()));
}
if (classfile.module() != null) {
attributes.add(new Attribute.Module(classfile.module()));
}
if (classfile.nestHost() != null) {
attributes.add(new Attribute.NestHost(classfile.nestHost()));
}
if (!classfile.nestMembers().isEmpty()) {
attributes.add(new Attribute.NestMembers(classfile.nestMembers()));
}
if (classfile.record() != null) {
attributes.add(recordAttribute(classfile.record()));
}
if (!classfile.permits().isEmpty()) {
attributes.add(new Attribute.PermittedSubclasses(classfile.permits()));
}
if (classfile.transitiveJar() != null) {
attributes.add(new Attribute.TurbineTransitiveJar(classfile.transitiveJar()));
}
return attributes;
}
private static Attribute recordAttribute(ClassFile.RecordInfo record) {
ImmutableList.Builder<Attribute.Record.Component> components = ImmutableList.builder();
for (ClassFile.RecordInfo.RecordComponentInfo component : record.recordComponents()) {
List<Attribute> attributes = new ArrayList<>();
if (component.signature() != null) {
attributes.add(new Attribute.Signature(component.signature()));
}
addAllAnnotations(attributes, component.annotations());
addAllTypeAnnotations(attributes, component.typeAnnotations());
components.add(
new Attribute.Record.Component(component.name(), component.descriptor(), attributes));
}
return new Attribute.Record(components.build());
}
/** Collects the {@link Attribute}s for a {@link MethodInfo}. */
static List<Attribute> methodAttributes(ClassFile.MethodInfo method) {
List<Attribute> attributes = new ArrayList<>();
addAllAnnotations(attributes, method.annotations());
addAllTypeAnnotations(attributes, method.typeAnnotations());
if (method.signature() != null) {
attributes.add(new Signature(method.signature()));
}
addParameterAnnotations(attributes, method.parameterAnnotations());
if (!method.exceptions().isEmpty()) {
attributes.add(new ExceptionsAttribute(method.exceptions()));
}
if (method.defaultValue() != null) {
attributes.add(new AnnotationDefault(method.defaultValue()));
}
if (!method.parameters().isEmpty()) {
attributes.add(new MethodParameters(method.parameters()));
}
return attributes;
}
/** Collects the {@link Attribute}s for a {@link FieldInfo}. */
static List<Attribute> fieldAttributes(ClassFile.FieldInfo field) {
List<Attribute> attributes = new ArrayList<>();
if (field.signature() != null) {
attributes.add(new Signature(field.signature()));
}
if (field.value() != null) {
attributes.add(new ConstantValue(field.value()));
}
addAllAnnotations(attributes, field.annotations());
addAllTypeAnnotations(attributes, field.typeAnnotations());
return attributes;
}
static void addAllAnnotations(List<Attribute> attributes, List<AnnotationInfo> annotations) {
List<AnnotationInfo> visible = new ArrayList<>();
List<AnnotationInfo> invisible = new ArrayList<>();
for (AnnotationInfo annotation : annotations) {
if (annotation.typeName().equals("Ljava/lang/Deprecated;")) {
attributes.add(Attribute.DEPRECATED);
}
(annotation.isRuntimeVisible() ? visible : invisible).add(annotation);
}
if (!visible.isEmpty()) {
attributes.add(new Attribute.RuntimeVisibleAnnotations(visible));
}
if (!invisible.isEmpty()) {
attributes.add(new Attribute.RuntimeInvisibleAnnotations(invisible));
}
}
private static void addAllTypeAnnotations(
List<Attribute> attributes, ImmutableList<TypeAnnotationInfo> annotations) {
List<TypeAnnotationInfo> visible = new ArrayList<>();
List<TypeAnnotationInfo> invisible = new ArrayList<>();
for (TypeAnnotationInfo annotation : annotations) {
(annotation.anno().isRuntimeVisible() ? visible : invisible).add(annotation);
}
if (!visible.isEmpty()) {
attributes.add(new Attribute.RuntimeVisibleTypeAnnotations(ImmutableList.copyOf(visible)));
}
if (!invisible.isEmpty()) {
attributes.add(
new Attribute.RuntimeInvisibleTypeAnnotations(ImmutableList.copyOf(invisible)));
}
}
static void addParameterAnnotations(
List<Attribute> attributes, ImmutableList<ImmutableList<AnnotationInfo>> annotations) {
List<List<AnnotationInfo>> visibles = new ArrayList<>();
List<List<AnnotationInfo>> invisibles = new ArrayList<>();
boolean hasVisible = false;
boolean hasInvisible = false;
for (List<AnnotationInfo> parameterAnnotations : annotations) {
List<AnnotationInfo> visible = new ArrayList<>();
List<AnnotationInfo> invisible = new ArrayList<>();
for (AnnotationInfo annotation : parameterAnnotations) {
if (annotation.isRuntimeVisible()) {
hasVisible = true;
visible.add(annotation);
} else {
hasInvisible = true;
invisible.add(annotation);
}
}
visibles.add(visible);
invisibles.add(invisible);
}
// only add the attributes if one of the nested lists is non-empty,
// i.e. at least one parameter was annotated
if (hasVisible) {
attributes.add(new Attribute.RuntimeVisibleParameterAnnotations(visibles));
}
if (hasInvisible) {
attributes.add(new Attribute.RuntimeInvisibleParameterAnnotations(invisibles));
}
}
private LowerAttributes() {}
}
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