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/*  Copyright 1999 Vince Via [email protected]
    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 com.viaoa.hub;

import com.viaoa.datasource.OADataSource;
import com.viaoa.object.OALinkInfo;
import com.viaoa.object.OAObject;
import com.viaoa.object.OAObjectInfoDelegate;


/**
 * Delegate that manages datasource related functionality for Hub.
 * @author vvia
 *
 */
public class HubDSDelegate {

	/**
	    Returns the OADataSource that works with this objects Class.
	*/
	protected static OADataSource getDataSource(Class c) {
	    return OADataSource.getDataSource(c);
	}
    
	// called by HubDelegate.updateMany2ManyLinks()
	protected static void updateMany2ManyLinks(OAObject masterObject, OAObject[] adds, OAObject[] removes, String propFromMaster) {
		OADataSource ds = OADataSource.getDataSource(masterObject.getClass());
		if (ds != null) ds.updateMany2ManyLinks(masterObject, adds, removes, propFromMaster);
	}

	// 20120612 remove m2m link table records when an object is deleted
    public static void removeMany2ManyLinks(Hub hub) {
        if (hub == null) return;
        Object objMaster = hub.getMasterObject();
        if (objMaster == null) return;
        if (!(objMaster instanceof OAObject)) return;
        if (!OAObject.class.isAssignableFrom(hub.getObjectClass())) {
            return;
        }
        OALinkInfo link = hub.datam.liDetailToMaster;
        if (link == null) return;
        if (!OAObjectInfoDelegate.isMany2Many(link)) return;
        
        String propFromMaster = OAObjectInfoDelegate.getReverseLinkInfo(link).getName();

        OAObject[] objs = HubAddRemoveDelegate.getRemovedObjects(hub);
        if (objs == null || objs.length == 0) return;
       
        OADataSource ds = OADataSource.getDataSource(objMaster.getClass());
        if (ds == null) return;
        
        ds.updateMany2ManyLinks((OAObject)objMaster, null, objs, propFromMaster);
    }

}