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/*******************************************************************************
 * Copyright (c) 2013 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.version;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.collection.DependencyCollectionContext;
import org.eclipse.aether.collection.VersionFilter;
import org.eclipse.aether.util.ConfigUtils;

/**
 * A version filter that blocks "*-SNAPSHOT" versions if the
 * {@link org.eclipse.aether.collection.CollectRequest#getRootArtifact() root artifact} of the dependency graph is not a
 * snapshot. Alternatively, this filter can be forced to always ban snapshot versions by setting the boolean
 * {@link RepositorySystemSession#getConfigProperties() configuration property} {@link #CONFIG_PROP_ENABLE} to
 * {@code true}.
 */
public final class ContextualSnapshotVersionFilter
    implements VersionFilter
{

    /**
     * The key in the repository session's {@link RepositorySystemSession#getConfigProperties() configuration
     * properties} used to store a {@link Boolean} flag whether this filter should be forced to ban snapshots. By
     * default, snapshots are only filtered if the root artifact is not a snapshot.
     */
    public static final String CONFIG_PROP_ENABLE = "aether.snapshotFilter";

    private final SnapshotVersionFilter filter;

    /**
     * Creates a new instance of this version filter.
     */
    public ContextualSnapshotVersionFilter()
    {
        filter = new SnapshotVersionFilter();
    }

    private boolean isEnabled( RepositorySystemSession session )
    {
        return ConfigUtils.getBoolean( session, false, CONFIG_PROP_ENABLE );
    }

    public void filterVersions( VersionFilterContext context )
    {
        if ( isEnabled( context.getSession() ) )
        {
            filter.filterVersions( context );
        }
    }

    public VersionFilter deriveChildFilter( DependencyCollectionContext context )
    {
        if ( !isEnabled( context.getSession() ) )
        {
            Artifact artifact = context.getArtifact();
            if ( artifact == null )
            {
                // no root artifact to test, allow snapshots and recheck once we reach the direct dependencies
                return this;
            }
            if ( artifact.isSnapshot() )
            {
                // root is a snapshot, allow snapshots all the way down
                return null;
            }
        }
        // artifact is a non-snapshot or filter explicitly enabled, block snapshots all the way down
        return filter;
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( this == obj )
        {
            return true;
        }
        else if ( null == obj || !getClass().equals( obj.getClass() ) )
        {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode()
    {
        return getClass().hashCode();
    }

}