dagger.internal.codegen.InjectionAnnotations.java Source code

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Here is the source code for dagger.internal.codegen.InjectionAnnotations.java

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/*
 * Copyright (C) 2014 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;

import static com.google.auto.common.MoreElements.isAnnotationPresent;
import static com.google.common.base.Preconditions.checkNotNull;
import static javax.lang.model.util.ElementFilter.constructorsIn;

import com.google.auto.common.AnnotationMirrors;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSet;
import java.util.Optional;
import javax.inject.Inject;
import javax.inject.Qualifier;
import javax.inject.Scope;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;

/**
 * Utilities relating to annotations defined in the {@code javax.inject} package.
 *
 * @author Gregory Kick
 * @since 2.0
 */
final class InjectionAnnotations {
    static Optional<AnnotationMirror> getQualifier(Element e) {
        checkNotNull(e);
        ImmutableSet<? extends AnnotationMirror> qualifierAnnotations = getQualifiers(e);
        switch (qualifierAnnotations.size()) {
        case 0:
            return Optional.empty();
        case 1:
            return Optional.<AnnotationMirror>of(qualifierAnnotations.iterator().next());
        default:
            throw new IllegalArgumentException(e + " was annotated with more than one @Qualifier annotation");
        }
    }

    static ImmutableSet<? extends AnnotationMirror> getQualifiers(Element element) {
        return AnnotationMirrors.getAnnotatedAnnotations(element, Qualifier.class);
    }

    static ImmutableSet<? extends AnnotationMirror> getScopes(Element element) {
        return AnnotationMirrors.getAnnotatedAnnotations(element, Scope.class);
    }

    /** Returns the constructors in {@code type} that are annotated with {@link Inject}. */
    static ImmutableSet<ExecutableElement> injectedConstructors(TypeElement type) {
        return FluentIterable.from(constructorsIn(type.getEnclosedElements()))
                .filter(constructor -> isAnnotationPresent(constructor, Inject.class)).toSet();
    }

    private InjectionAnnotations() {
    }
}