package org.alfresco.repo.forum;

import org.alfresco.model.ForumModel;
import org.alfresco.repo.copy.CopyBehaviourCallback;
import org.alfresco.repo.copy.CopyDetails;
import org.alfresco.repo.copy.CopyServicePolicies;
import org.alfresco.repo.copy.DefaultCopyBehaviourCallback;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.repo.policy.PolicyComponent;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;

/**
 * {@link ForumModel#ASPECT_COMMENTS_ROLLUP comments rollup} aspect behaviour bean.
 * This aspect should not be copied.
 * 
 * @author Neil Mc Erlean
 * @since 4.0
 * 
 * @see ForumPostBehaviours#onUpdateProperties(org.alfresco.service.cmr.repository.NodeRef, java.util.Map, java.util.Map)
 *      for a {@link ForumModel#ASPECT_COMMENTS_ROLLUP}-related behaviour, which handles comment count recalculations.
 */
public class CommentsRollupAspect implements CopyServicePolicies.OnCopyNodePolicy
{
    private PolicyComponent policyComponent;

    /**
     * Set the policy component
     * 
     * @param policyComponent   policy component
     */
    public void setPolicyComponent(PolicyComponent policyComponent)
    {
        this.policyComponent = policyComponent;
    }
    
    /**
     * Initialise method
     */
    public void init()
    {
        this.policyComponent.bindClassBehaviour(
                QName.createQName(NamespaceService.ALFRESCO_URI, "getCopyCallback"), 
                ForumModel.ASPECT_COMMENTS_ROLLUP, 
                new JavaBehaviour(this, "getCopyCallback"));
    }
    
    /**
     * @return              Returns CopyBehaviourCallback
     */
    public CopyBehaviourCallback getCopyCallback(QName classRef, CopyDetails copyDetails)
    {
        return CommentsRollupAspectCopyBehaviourCallback.INSTANCE;
    }

    /**
     * Behaviour for the {@link ForumModel#ASPECT_COMMENTS_ROLLUP <b>fm:commentsRollup</b>} aspect.
     */
    private static class CommentsRollupAspectCopyBehaviourCallback extends DefaultCopyBehaviourCallback
    {
        private static final CopyBehaviourCallback INSTANCE = new CommentsRollupAspectCopyBehaviourCallback();
        
        /**
         * We do not copy the {@link ForumModel#ASPECT_COMMENTS_ROLLUP fm:commentsRollup} aspect.
         */
        @Override
        public boolean getMustCopy(QName classQName, CopyDetails copyDetails)
        {
            // Prevent the copying of the aspect.
            return false;
        }
    }
}