org.apache.maven.graph.effective.traverse.BuildOrderTraversal Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright 2012 John Casey
 * 
 * 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.apache.maven.graph.effective.traverse;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.apache.maven.graph.common.ref.ArtifactRef;
import org.apache.maven.graph.common.ref.ProjectRef;
import org.apache.maven.graph.common.ref.ProjectVersionRef;
import org.apache.maven.graph.effective.EProjectCycle;
import org.apache.maven.graph.effective.EProjectNet;
import org.apache.maven.graph.effective.filter.OrFilter;
import org.apache.maven.graph.effective.filter.ParentFilter;
import org.apache.maven.graph.effective.filter.ProjectRelationshipFilter;
import org.apache.maven.graph.effective.rel.ProjectRelationship;
import org.apache.maven.graph.effective.traverse.model.BuildOrder;

public class BuildOrderTraversal
    extends AbstractFilteringTraversal
{

    private final List order = new ArrayList();

    private Set cycles;

    public BuildOrderTraversal()
    {
    }

    public BuildOrderTraversal( final ProjectRelationshipFilter filter )
    {
        super( new OrFilter( filter, new ParentFilter( false ) ) );
    }

    public BuildOrder getBuildOrder()
    {
        return new BuildOrder( order, cycles );
    }

    @Override
    protected boolean shouldTraverseEdge( final ProjectRelationship relationship,
                                          final List> path, final int pass )
    {
        final ProjectVersionRef decl = relationship.getDeclaring();

        ProjectVersionRef target = relationship.getTarget();
        if ( target instanceof ArtifactRef )
        {
            target = ( (ArtifactRef) target ).asProjectVersionRef();
        }

        final ProjectRef baseDecl = new ProjectRef( decl.getGroupId(), decl.getArtifactId() );
        final ProjectRef baseTgt = new ProjectRef( target.getGroupId(), target.getArtifactId() );

        int declIdx = order.indexOf( baseDecl );
        final int tgtIdx = order.indexOf( baseTgt );
        if ( declIdx < 0 )
        {
            declIdx = order.size();
            order.add( baseDecl );
        }

        if ( tgtIdx < 0 )
        {
            order.add( declIdx, baseTgt );
        }

        return true;
    }

    @Override
    public void endTraverse( final int pass, final EProjectNet network )
    {
        super.endTraverse( pass, network );

        final Set cycles = new HashSet( network.getCycles() );
        for ( final Iterator iterator = cycles.iterator(); iterator.hasNext(); )
        {
            final EProjectCycle eProjectCycle = iterator.next();
            ProjectRelationshipFilter filter = getFilter();

            boolean include = true;
            for ( final ProjectRelationship rel : eProjectCycle )
            {
                if ( !filter.accept( rel ) )
                {
                    include = false;
                    break;
                }

                filter = filter.getChildFilter( rel );
            }

            if ( !include )
            {
                iterator.remove();
            }
        }

        this.cycles = cycles;
    }

}