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/*
* Copyright (C) 2017 The Dagger Authors.
*
* 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 dagger.internal.codegen.writing;
import static com.squareup.javapoet.MethodSpec.constructorBuilder;
import static com.squareup.javapoet.MethodSpec.methodBuilder;
import static com.squareup.javapoet.TypeSpec.classBuilder;
import static dagger.internal.codegen.extension.DaggerStreams.toImmutableList;
import static javax.lang.model.element.Modifier.PRIVATE;
import androidx.room.compiler.processing.XElement;
import com.google.common.collect.ImmutableList;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;
import dagger.internal.codegen.base.SourceFileGenerator;
import javax.lang.model.element.Modifier;
/**
* A source file generator that only writes the relevant code necessary for Bazel to create a
* correct header (ABI) jar.
*/
public final class HjarSourceFileGenerator<T> extends SourceFileGenerator<T> {
private final SourceFileGenerator<T> delegate;
private HjarSourceFileGenerator(SourceFileGenerator<T> delegate) {
super(delegate);
this.delegate = delegate;
}
public static <T> SourceFileGenerator<T> wrap(SourceFileGenerator<T> delegate) {
return new HjarSourceFileGenerator<>(delegate);
}
@Override
public XElement originatingElement(T input) {
return delegate.originatingElement(input);
}
@Override
public ImmutableList<TypeSpec.Builder> topLevelTypes(T input) {
return delegate.topLevelTypes(input).stream()
.map(completeType -> skeletonType(completeType.build()))
.collect(toImmutableList());
}
private TypeSpec.Builder skeletonType(TypeSpec completeType) {
TypeSpec.Builder skeleton =
classBuilder(completeType.name)
.addSuperinterfaces(completeType.superinterfaces)
.addTypeVariables(completeType.typeVariables)
.addModifiers(completeType.modifiers.toArray(new Modifier[0]))
.addAnnotations(completeType.annotations);
if (!completeType.superclass.equals(ClassName.OBJECT)) {
skeleton.superclass(completeType.superclass);
}
completeType.methodSpecs.stream()
.filter(method -> !method.modifiers.contains(PRIVATE) || method.isConstructor())
.map(this::skeletonMethod)
.forEach(skeleton::addMethod);
completeType.fieldSpecs.stream()
.filter(field -> !field.modifiers.contains(PRIVATE))
.map(this::skeletonField)
.forEach(skeleton::addField);
completeType.typeSpecs.stream()
.map(type -> skeletonType(type).build())
.forEach(skeleton::addType);
return skeleton;
}
private MethodSpec skeletonMethod(MethodSpec completeMethod) {
MethodSpec.Builder skeleton =
completeMethod.isConstructor()
? constructorBuilder()
: methodBuilder(completeMethod.name).returns(completeMethod.returnType);
if (completeMethod.isConstructor()) {
// Code in Turbine must (for technical reasons in javac) have a valid super() call for
// constructors, otherwise javac will bark, and Turbine has no way to avoid this. So we retain
// constructor method bodies if they do exist
skeleton.addCode(completeMethod.code);
}
return skeleton
.addModifiers(completeMethod.modifiers)
.addTypeVariables(completeMethod.typeVariables)
.addParameters(completeMethod.parameters)
.addExceptions(completeMethod.exceptions)
.varargs(completeMethod.varargs)
.addAnnotations(completeMethod.annotations)
.build();
}
private FieldSpec skeletonField(FieldSpec completeField) {
return FieldSpec.builder(
completeField.type,
completeField.name,
completeField.modifiers.toArray(new Modifier[0]))
.addAnnotations(completeField.annotations)
.build();
}
}
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