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/*******************************************************************************
* Copyright (c) 2010, 2012 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.util.graph.transformer;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
import org.eclipse.aether.RepositoryException;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.collection.DependencyGraphTransformationContext;
import org.eclipse.aether.collection.DependencyGraphTransformer;
import org.eclipse.aether.graph.Dependency;
import org.eclipse.aether.graph.DependencyNode;
/**
* A dependency graph transformer that identifies conflicting dependencies. When this transformer has executed, the
* transformation context holds a {@code Map} where dependency nodes that belong to the same
* conflict group will have an equal conflict identifier. This map is stored using the key
* {@link TransformationContextKeys#CONFLICT_IDS}.
*/
public final class ConflictMarker
implements DependencyGraphTransformer
{
/**
* After the execution of this method, every DependencyNode with an attached dependency is member of one conflict
* group.
*
* @see DependencyGraphTransformer#transformGraph(DependencyNode, DependencyGraphTransformationContext)
*/
public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context )
throws RepositoryException
{
@SuppressWarnings( "unchecked" )
Map stats = (Map) context.get( TransformationContextKeys.STATS );
long time1 = System.currentTimeMillis();
Map nodes = new IdentityHashMap( 1024 );
Map