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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.hub.HubListener.InsertLocation;
import com.viaoa.object.OALinkInfo;
import com.viaoa.object.OAObject;
import com.viaoa.object.OAObjectInfo;

/**
 * Takes a recursive hub (hubRoot) and populates a Hub (hubFlat) with all of the children.
 */
public class HubFlattened {
	private Hub hubRoot;
	private Hub hubFlat;
	// private OALinkInfo liToRoot;
	private OALinkInfo liRecursiveToParent;
	private HubMerger hm;

	public HubFlattened(Hub hubRoot, Hub hubFlat) {
		this.hubRoot = hubRoot;
		this.hubFlat = hubFlat;
		setup();
	}

	public Hub getRootHub() {
		return hubRoot;
	}

	@Override
	protected void finalize() throws Throwable {
		super.finalize();
		hm.close();
	}

	void setup() {
		if (hubFlat == null || hubRoot == null) {
			return;
		}

		// must be recursive
		OAObjectInfo oi = hubRoot.getOAObjectInfo();
		liRecursiveToParent = oi.getRecursiveLinkInfo(OALinkInfo.ONE);
		if (liRecursiveToParent == null) {
			throw new RuntimeException(hubRoot + " is not recursive");
		}

		// property that owns hubRoot
		// liToRoot = HubDetailDelegate.getLinkInfoFromDetailToMaster(hubRoot);

		hm = new HubMerger(hubRoot, hubFlat, liRecursiveToParent.getReverseName(), false, null, true, true, true);

		// make sure that any new object added to hubFlat(from a new command)  has correct link to parent/master
		HubListener hl = new HubListenerAdapter() {
			@Override
			public void afterInsert(HubEvent e) {
				afterAdd(e);
			}

			@Override
			public void afterAdd(HubEvent e) {
				if (e == null) {
					return;
				}

				if (liRecursiveToParent == null) {
					return;
				}
				if (liRecursiveToParent.getValue(e.getObject()) != null) {
					return;
				}
				hubRoot.add((TYPE) e.getObject()); // this will set it
			}
		};
		hl.setLocation(InsertLocation.LAST);
		hubFlat.addHubListener(hl);
	}
}