gradle-master/subprojects/core/src/main/java/org/gradle/execution/plan/TaskDependencyResolver.java
/*
 * Copyright 2018 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.execution.plan;

import org.gradle.api.NonNullApi;
import org.gradle.api.internal.TaskInternal;
import org.gradle.api.internal.tasks.CachingTaskDependencyResolveContext;
import org.gradle.internal.service.scopes.Scopes;
import org.gradle.internal.service.scopes.ServiceScope;

import javax.annotation.Nullable;
import java.util.List;
import java.util.Set;

@NonNullApi
@ServiceScope(Scopes.Build.class)
public class TaskDependencyResolver {
    private final List<DependencyResolver> dependencyResolvers;
    private CachingTaskDependencyResolveContext<Node> context;

    public TaskDependencyResolver(List<DependencyResolver> dependencyResolvers) {
        this.dependencyResolvers = dependencyResolvers;
        this.context = createTaskDependencyResolverContext(dependencyResolvers);
    }

    public void clear() {
        context = createTaskDependencyResolverContext(dependencyResolvers);
    }

    private static CachingTaskDependencyResolveContext<Node> createTaskDependencyResolverContext(List<DependencyResolver> workResolvers) {
        return new CachingTaskDependencyResolveContext<Node>(workResolvers);
    }

    public Set<Node> resolveDependenciesFor(@Nullable TaskInternal task, Object dependencies) {
        return context.getDependencies(task, dependencies);
    }
}
