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/*******************************************************************************
 * Copyright (c) 2010, 2014 Sonatype, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Sonatype, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.aether.impl;

import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.collection.CollectRequest;
import org.eclipse.aether.collection.CollectResult;
import org.eclipse.aether.collection.DependencyCollectionException;

/**
 * Given a collection of direct dependencies, recursively gathers their transitive dependencies and calculates the
 * dependency graph.
 * 
 * @noimplement This interface is not intended to be implemented by clients.
 * @noextend This interface is not intended to be extended by clients.
 * @provisional This type is provisional and can be changed, moved or removed without prior notice.
 */
public interface DependencyCollector
{

    /**
     * Collects the transitive dependencies of some artifacts and builds a dependency graph. Note that this operation is
     * only concerned about determining the coordinates of the transitive dependencies and does not actually resolve the
     * artifact files. The supplied session carries various hooks to customize the dependency graph that must be invoked
     * throughout the operation.
     * 
     * @param session The repository session, must not be {@code null}.
     * @param request The collection request, must not be {@code null}.
     * @return The collection result, never {@code null}.
     * @throws DependencyCollectionException If the dependency tree could not be built.
     * @see RepositorySystemSession#getDependencyTraverser()
     * @see RepositorySystemSession#getDependencyManager()
     * @see RepositorySystemSession#getDependencySelector()
     * @see RepositorySystemSession#getVersionFilter()
     * @see RepositorySystemSession#getDependencyGraphTransformer()
     * @see RepositorySystem#collectDependencies(RepositorySystemSession, CollectRequest)
     */
    CollectResult collectDependencies( RepositorySystemSession session, CollectRequest request )
        throws DependencyCollectionException;

}