core/runtime/src/main/java/org/qi4j/runtime/structure/UsedLayersModel.java

/*
 * Copyright (c) 2008, Rickard Öberg. All Rights Reserved.
 *
 * 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.qi4j.runtime.structure;

import java.util.List;
import org.qi4j.api.structure.UsedLayersDescriptor;
import org.qi4j.functional.HierarchicalVisitor;
import org.qi4j.functional.VisitableHierarchy;

/**
 * JAVADOC
 */
public final class UsedLayersModel
    implements UsedLayersDescriptor, VisitableHierarchy<Object, Object>
{
    private final List<LayerModel> usedLayers;

    public UsedLayersModel( List<LayerModel> usedLayers )
    {
        this.usedLayers = usedLayers;
    }

    @Override
    public Iterable<LayerModel> layers()
    {
        return usedLayers;
    }

    @Override
    public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
        throws ThrowableType
    {
        if( visitor.visitEnter( this ) )
        {
            for( LayerModel usedLayer : usedLayers )
            {
                if( !usedLayer.accept( visitor ) )
                {
                    break;
                }
            }
        }

        return visitor.visitLeave( this );
    }

    public UsedLayersInstance newInstance( List<LayerInstance> usedLayerInstances )
    {
        return new UsedLayersInstance( usedLayerInstances );
    }
}