spring BuildpackResolvers 源码
springboot BuildpackResolvers 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/build/BuildpackResolvers.java
/*
* Copyright 2012-2021 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
*
* https://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.springframework.boot.buildpack.platform.build;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* All {@link BuildpackResolver} instances that can be used to resolve
* {@link BuildpackReference BuildpackReferences}.
*
* @author Scott Frederick
* @author Phillip Webb
*/
final class BuildpackResolvers {
private static final List<BuildpackResolver> resolvers = getResolvers();
private BuildpackResolvers() {
}
private static List<BuildpackResolver> getResolvers() {
List<BuildpackResolver> resolvers = new ArrayList<>();
resolvers.add(BuilderBuildpack::resolve);
resolvers.add(DirectoryBuildpack::resolve);
resolvers.add(TarGzipBuildpack::resolve);
resolvers.add(ImageBuildpack::resolve);
return Collections.unmodifiableList(resolvers);
}
/**
* Resolve a collection of {@link BuildpackReference BuildpackReferences} to a
* {@link Buildpacks} instance.
* @param context the resolver context
* @param references the references to resolve
* @return a {@link Buildpacks} instance
*/
static Buildpacks resolveAll(BuildpackResolverContext context, Collection<BuildpackReference> references) {
Assert.notNull(context, "Context must not be null");
if (CollectionUtils.isEmpty(references)) {
return Buildpacks.EMPTY;
}
List<Buildpack> buildpacks = new ArrayList<>(references.size());
for (BuildpackReference reference : references) {
buildpacks.add(resolve(context, reference));
}
return Buildpacks.of(buildpacks);
}
private static Buildpack resolve(BuildpackResolverContext context, BuildpackReference reference) {
Assert.notNull(reference, "Reference must not be null");
for (BuildpackResolver resolver : resolvers) {
Buildpack buildpack = resolver.resolve(context, reference);
if (buildpack != null) {
return buildpack;
}
}
throw new IllegalArgumentException("Invalid buildpack reference '" + reference + "'");
}
}
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- 本文标签： Java Spring Spring Boot
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