/*
* Copyright 2017 the original author or 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 org.gradle.api.internal.artifacts.transform;
import com.google.common.collect.Maps;
import org.gradle.api.Transformer;
import org.gradle.api.attributes.AttributeContainer;
import org.gradle.api.internal.artifacts.VariantTransformRegistry;
import org.gradle.api.internal.attributes.AttributeContainerInternal;
import org.gradle.api.internal.attributes.AttributesSchemaInternal;
import org.gradle.api.internal.attributes.ImmutableAttributes;
import org.gradle.api.internal.attributes.ImmutableAttributesFactory;
import org.gradle.internal.component.model.AttributeMatcher;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class VariantAttributeMatchingCache {
private final VariantTransformRegistry variantTransforms;
private final AttributesSchemaInternal schema;
private final ImmutableAttributesFactory attributesFactory;
private final Map<AttributeContainer, AttributeSpecificCache> attributeSpecificCache = Maps.newConcurrentMap();
public VariantAttributeMatchingCache(VariantTransformRegistry variantTransforms, AttributesSchemaInternal schema, ImmutableAttributesFactory attributesFactory) {
this.variantTransforms = variantTransforms;
this.schema = schema;
this.attributesFactory = attributesFactory;
}
public void collectConsumerVariants(AttributeContainerInternal actual, AttributeContainerInternal requested, ConsumerVariantMatchResult result) {
AttributeSpecificCache toCache = getCache(requested);
ConsumerVariantMatchResult cachedResult = toCache.transforms.get(actual);
if (cachedResult == null) {
cachedResult = new ConsumerVariantMatchResult();
findProducersFor(actual, requested, cachedResult);
toCache.transforms.put(actual, cachedResult);
}
cachedResult.applyTo(result);
}
private void findProducersFor(AttributeContainerInternal actual, AttributeContainerInternal requested, ConsumerVariantMatchResult result) {
// Prefer direct transformation over indirect transformation
List<VariantTransformRegistry.Registration> candidates = new ArrayList<VariantTransformRegistry.Registration>();
for (VariantTransformRegistry.Registration transform : variantTransforms.getTransforms()) {
if (matchAttributes(transform.getTo(), requested)) {
if (matchAttributes(actual, transform.getFrom())) {
ImmutableAttributes variantAttributes = attributesFactory.concat(actual.asImmutable(), transform.getTo().asImmutable());
result.matched(variantAttributes, transform.getArtifactTransform(), 1);
}
candidates.add(transform);
}
}
if (result.hasMatches()) {
return;
}
for (final VariantTransformRegistry.Registration candidate : candidates) {
ConsumerVariantMatchResult inputVariants = new ConsumerVariantMatchResult();
collectConsumerVariants(actual, candidate.getFrom(), inputVariants);
if (!inputVariants.hasMatches()) {
continue;
}
for (final ConsumerVariantMatchResult.ConsumerVariant inputVariant : inputVariants.getMatches()) {
ImmutableAttributes variantAttributes = attributesFactory.concat(inputVariant.attributes.asImmutable(), candidate.getTo().asImmutable());
Transformer<List<File>, File> transformer = new Transformer<List<File>, File>() {
@Override
public List<File> transform(File file) {
List<File> result = new ArrayList<File>();
for (File intermediate : inputVariant.transformer.transform(file)) {
result.addAll(candidate.getArtifactTransform().transform(intermediate));
}
return result;
}
};
result.matched(variantAttributes, transformer, inputVariant.depth + 1);
}
}
}
private AttributeSpecificCache getCache(AttributeContainer attributes) {
AttributeSpecificCache cache = attributeSpecificCache.get(attributes);
if (cache == null) {
cache = new AttributeSpecificCache();
attributeSpecificCache.put(attributes, cache);
}
return cache;
}
private boolean matchAttributes(AttributeContainer actual, AttributeContainer requested) {
AttributeMatcher schemaToMatchOn = schema.matcher();
Map<AttributeContainer, Boolean> cache = getCache(requested).ignoreExtraActual;
Boolean match = cache.get(actual);
if (match == null) {
match = schemaToMatchOn.isMatching(actual, requested);
cache.put(actual, match);
}
return match;
}
private static class AttributeSpecificCache {
private final Map<AttributeContainer, Boolean> ignoreExtraActual = Maps.newConcurrentMap();
private final Map<AttributeContainer, ConsumerVariantMatchResult> transforms = Maps.newConcurrentMap();
}
}