64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
/*
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* Copyright (C) 2019 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.internal.codegen.kotlin;
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import static com.google.auto.common.MoreElements.isAnnotationPresent;
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import static dagger.internal.codegen.langmodel.DaggerElements.closestEnclosingTypeElement;
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import dagger.internal.codegen.base.ClearableCache;
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import java.util.HashMap;
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import java.util.Map;
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import javax.inject.Inject;
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import javax.inject.Singleton;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.TypeElement;
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import kotlin.Metadata;
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/**
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* Factory creating Kotlin metadata data objects.
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*
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* <p>The metadata is cache since it can be expensive to parse the information stored in a proto
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* binary string format in the metadata annotation values.
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*/
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@Singleton
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public final class KotlinMetadataFactory implements ClearableCache {
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private final Map<TypeElement, KotlinMetadata> metadataCache = new HashMap<>();
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@Inject
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KotlinMetadataFactory() {}
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/**
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* Parses and returns the {@link KotlinMetadata} out of a given element.
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*
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* @throws IllegalStateException if the element has no metadata or is not enclosed in a type
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* element with metadata. To check if an element has metadata use {@link
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* KotlinMetadataUtil#hasMetadata(Element)}
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*/
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public KotlinMetadata create(Element element) {
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TypeElement enclosingElement = closestEnclosingTypeElement(element);
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if (!isAnnotationPresent(enclosingElement, Metadata.class)) {
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throw new IllegalStateException("Missing @Metadata for: " + enclosingElement);
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}
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return metadataCache.computeIfAbsent(enclosingElement, KotlinMetadata::from);
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}
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@Override
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public void clearCache() {
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metadataCache.clear();
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}
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}
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