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    • org.gradle.api.internal.tasks.CachingTaskDependencyResolveContext Maven / Gradle / Ivy

    /*
 * Copyright 2010 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.tasks;

import org.gradle.api.Buildable;
import org.gradle.api.GradleException;
import org.gradle.api.Task;
import org.gradle.api.tasks.TaskDependency;
import org.gradle.internal.graph.CachingDirectedGraphWalker;
import org.gradle.internal.graph.DirectedGraph;

import java.util.Collection;
import java.util.LinkedList;
import java.util.Set;

/**
 * 
    A {@link TaskDependencyResolveContext} which caches the dependencies for each {@link
 * org.gradle.api.tasks.TaskDependency} and {@link org.gradle.api.Buildable} instance during traversal of task
 * dependencies.
    
 *
 * 
    Supported types:
     
      
 *
 * 
    • {@link org.gradle.api.Task}
      • 
 *
 * 
    • {@link org.gradle.api.tasks.TaskDependency}
      • 
 *
 * 
    • {@link org.gradle.api.internal.tasks.TaskDependencyInternal}
      • 
 *
 * 
    • {@link org.gradle.api.Buildable}
      • 
 *
 * 
    
 */
public class CachingTaskDependencyResolveContext implements TaskDependencyResolveContext, TaskDependency {
    private final LinkedList queue = new LinkedList();
    private final CachingDirectedGraphWalker walker = new CachingDirectedGraphWalker(
            new TaskGraphImpl());
    private Task task;

    public Set getDependencies(Task task) {
        add(task.getTaskDependencies());
        return resolve(task);
    }

    public Task getTask() {
        return task;
    }

    public Set resolve(Task task) {
        this.task = task;
        try {
            return doResolve();
        } catch (Exception e) {
            throw new GradleException(String.format("Could not determine the dependencies of %s.", task), e);
        } finally {
            queue.clear();
            this.task = null;
        }
    }

    private Set doResolve() {
        walker.add(queue);
        return walker.findValues();
    }

    public void add(Object dependency) {
        queue.add(dependency);
    }

    private class TaskGraphImpl implements DirectedGraph {
        public void getNodeValues(Object node, Collection values, Collection connectedNodes) {
            if (node instanceof TaskDependencyContainer) {
                TaskDependencyContainer taskDependency = (TaskDependencyContainer) node;
                queue.clear();
                taskDependency.visitDependencies(CachingTaskDependencyResolveContext.this);
                connectedNodes.addAll(queue);
            } else if (node instanceof Buildable) {
                Buildable buildable = (Buildable) node;
                connectedNodes.add(buildable.getBuildDependencies());
            } else if (node instanceof TaskDependency) {
                TaskDependency dependency = (TaskDependency) node;
                values.addAll(dependency.getDependencies(task));
            } else if (node instanceof Task) {
                values.add((Task) node);
            } else {
                throw new IllegalArgumentException(String.format("Cannot resolve object of unknown type %s to a Task.",
                        node.getClass().getSimpleName()));
            }
        }
    }
}
    
    
    
    

    




    
    
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