/*
 * Copyright (C) 2005-2007 Alfresco Software Limited.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.repo.rule.ruletrigger;

import org.alfresco.repo.node.NodeServicePolicies;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.rule.RuleServiceException;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * A rule trigger for the creation of <b>secondary child associations</b>.
 * <p>
 * Policy names supported are:
 * <ul>
 *   <li>{@linkplain NodeServicePolicies.OnCreateChildAssociationPolicy}</li>
 *   <li>{@linkplain NodeServicePolicies.BeforeDeleteChildAssociationPolicy}</li>
 * </ul>
 * 
 * @author Roy Wetherall
 */
public class SingleChildAssocRefPolicyRuleTrigger
        extends RuleTriggerAbstractBase
        implements NodeServicePolicies.OnCreateChildAssociationPolicy,
                   NodeServicePolicies.BeforeDeleteChildAssociationPolicy

{
	private static final String ERR_POLICY_NAME_NOT_SET = "Unable to register rule trigger since policy name has not been set.";
	
    /**
     * The logger
     */
    private static Log logger = LogFactory.getLog(SingleChildAssocRefPolicyRuleTrigger.class);
    
	private String policyNamespace = NamespaceService.ALFRESCO_URI;
	
	private String policyName;
	
	private boolean isClassBehaviour = false;
	
	public void setPolicyNamespace(String policyNamespace)
	{
		this.policyNamespace = policyNamespace;
	}
	
	public void setPolicyName(String policyName)
	{
		this.policyName = policyName;
	}
	
	public void setIsClassBehaviour(boolean isClassBehaviour)
	{
		this.isClassBehaviour = isClassBehaviour;
	}
	
	/**
	 * @see org.alfresco.repo.rule.ruletrigger.RuleTrigger#registerRuleTrigger()
	 */
	public void registerRuleTrigger()
	{
		if (policyName == null)
		{
			throw new RuleServiceException(ERR_POLICY_NAME_NOT_SET);
		}
		
		if (isClassBehaviour == true)
		{
			this.policyComponent.bindClassBehaviour(
					QName.createQName(this.policyNamespace, this.policyName), 
					this, 
					new JavaBehaviour(this, policyName));
		}
		else
		{
			this.policyComponent.bindAssociationBehaviour(
					QName.createQName(this.policyNamespace, this.policyName), 
					this, 
					new JavaBehaviour(this, policyName));
		}
	}

    public void beforeDeleteChildAssociation(ChildAssociationRef childAssocRef)
    {
        if (logger.isDebugEnabled() == true)
        {
            logger.debug("Single child assoc trigger (policy = " + this.policyName + ") fired for parent node " + childAssocRef.getParentRef() + " and child node " + childAssocRef.getChildRef());
        }
        
        triggerRules(childAssocRef.getParentRef(), childAssocRef.getChildRef());
    }

    public void onCreateChildAssociation(ChildAssociationRef childAssocRef, boolean isNewNode)
    {
        if (isNewNode)
        {
            return;
        }
        if (logger.isDebugEnabled() == true)
        {
            logger.debug("Single child assoc trigger (policy = " + this.policyName + ") fired for parent node " + childAssocRef.getParentRef() + " and child node " + childAssocRef.getChildRef());
        }
        
        triggerRules(childAssocRef.getParentRef(), childAssocRef.getChildRef());
    }
}