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A fast dependency injector for Android and Java.
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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.base;
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 dagger.internal.codegen.extension.DaggerStreams.toImmutableSet;
import static dagger.internal.codegen.langmodel.Accessibility.isElementAccessibleFrom;
import static dagger.internal.codegen.xprocessing.XElements.closestEnclosingTypeElement;
import static javax.lang.model.element.Modifier.PRIVATE;
import androidx.room.compiler.processing.XConstructorElement;
import androidx.room.compiler.processing.XElement;
import androidx.room.compiler.processing.XExecutableParameterElement;
import androidx.room.compiler.processing.XProcessingEnv;
import androidx.room.compiler.processing.XType;
import androidx.room.compiler.processing.XTypeElement;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;
import dagger.internal.codegen.javapoet.CodeBlocks;
import dagger.internal.codegen.javapoet.TypeNames;
import java.util.Optional;
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 SourceFileHjarGenerator extends SourceFileGenerator {
public static SourceFileGenerator wrap(
SourceFileGenerator delegate, XProcessingEnv processingEnv) {
return new SourceFileHjarGenerator<>(delegate, processingEnv);
}
private final SourceFileGenerator delegate;
private final XProcessingEnv processingEnv;
private SourceFileHjarGenerator(SourceFileGenerator delegate, XProcessingEnv processingEnv) {
super(delegate);
this.delegate = delegate;
this.processingEnv = processingEnv;
}
@Override
public XElement originatingElement(T input) {
return delegate.originatingElement(input);
}
@Override
public ImmutableList topLevelTypes(T input) {
String packageName = closestEnclosingTypeElement(originatingElement(input)).getPackageName();
return delegate.topLevelTypes(input).stream()
.map(completeType -> skeletonType(packageName, completeType.build()))
.collect(toImmutableList());
}
private TypeSpec.Builder skeletonType(String packageName, 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(completeMethod -> skeletonMethod(packageName, completeType, completeMethod))
.forEach(skeleton::addMethod);
completeType.fieldSpecs.stream()
.filter(field -> !field.modifiers.contains(PRIVATE))
.map(this::skeletonField)
.forEach(skeleton::addField);
completeType.typeSpecs.stream()
.map(type -> skeletonType(packageName, type).build())
.forEach(skeleton::addType);
completeType.alwaysQualifiedNames
.forEach(skeleton::alwaysQualify);
return skeleton;
}
private MethodSpec skeletonMethod(
String packageName, TypeSpec completeType, MethodSpec completeMethod) {
MethodSpec.Builder skeleton =
completeMethod.isConstructor()
? constructorBuilder()
: methodBuilder(completeMethod.name).returns(completeMethod.returnType);
if (completeMethod.isConstructor()) {
getRequiredSuperCall(packageName, completeType)
.ifPresent(superCall -> skeleton.addStatement("$L", superCall));
} else if (!completeMethod.returnType.equals(TypeName.VOID)) {
skeleton.addStatement("return $L", getDefaultValueCodeBlock(completeMethod.returnType));
}
return skeleton
.addModifiers(completeMethod.modifiers)
.addTypeVariables(completeMethod.typeVariables)
.addParameters(completeMethod.parameters)
.addExceptions(completeMethod.exceptions)
.varargs(completeMethod.varargs)
.addAnnotations(completeMethod.annotations)
.build();
}
private Optional getRequiredSuperCall(String packageName, TypeSpec completeType) {
if (completeType.superclass.equals(TypeName.OBJECT)) {
return Optional.empty();
}
ClassName rawSuperClass = (ClassName) TypeNames.rawTypeName(completeType.superclass);
XTypeElement superTypeElement =
processingEnv.requireTypeElement(rawSuperClass.canonicalName());
ImmutableSet accessibleConstructors =
superTypeElement.getConstructors().stream()
.filter(
constructor ->
// isElementAccessibleFrom doesn't take protected into account so check manually
constructor.isProtected()
|| isElementAccessibleFrom(constructor, packageName))
.collect(toImmutableSet());
// If there's an accessible default constructor we don't need to call super() manually.
if (accessibleConstructors.isEmpty()
|| accessibleConstructors.stream()
.anyMatch(constructor -> constructor.getParameters().isEmpty())) {
return Optional.empty();
}
return Optional.of(
CodeBlock.of(
"super($L)",
CodeBlocks.makeParametersCodeBlock(
// We just choose the first constructor (it doesn't really matter since we're just
// trying to ensure the constructor body compiles).
accessibleConstructors.stream().findFirst().get().getParameters().stream()
.map(XExecutableParameterElement::getType)
.map(XType::getTypeName)
.map(SourceFileHjarGenerator::getDefaultValueCodeBlock)
.collect(toImmutableList()))));
}
/**
* Returns a {@link CodeBlock} containing the default value for the given {@code typeName}.
*
* See https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html.
*/
private static CodeBlock getDefaultValueCodeBlock(TypeName typeName) {
if (typeName.isPrimitive()) {
if (typeName.equals(TypeName.BOOLEAN)) {
return CodeBlock.of("false");
} else if (typeName.equals(TypeName.CHAR)) {
return CodeBlock.of("'\u0000'");
} else if (typeName.equals(TypeName.BYTE)) {
return CodeBlock.of("0");
} else if (typeName.equals(TypeName.SHORT)) {
return CodeBlock.of("0");
} else if (typeName.equals(TypeName.INT)) {
return CodeBlock.of("0");
} else if (typeName.equals(TypeName.LONG)) {
return CodeBlock.of("0L");
} else if (typeName.equals(TypeName.FLOAT)) {
return CodeBlock.of("0.0f");
} else if (typeName.equals(TypeName.DOUBLE)) {
return CodeBlock.of("0.0d");
} else {
throw new AssertionError("Unexpected type: " + typeName);
}
}
return CodeBlock.of("null");
}
private FieldSpec skeletonField(FieldSpec completeField) {
return FieldSpec.builder(
completeField.type,
completeField.name,
completeField.modifiers.toArray(new Modifier[0]))
.addAnnotations(completeField.annotations)
.build();
}
}