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Core services for Usergrid system.

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/*******************************************************************************
 * Copyright 2012 Apigee Corporation
 * 
 * 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.usergrid.persistence;

import java.util.UUID;

import org.usergrid.persistence.cassandra.CassandraPersistenceUtils;

public class SimpleCollectionRef implements CollectionRef {

	public static final String MEMBER_ENTITY_TYPE = "member";

	protected final EntityRef ownerRef;
	protected final String collectionName;
	protected final EntityRef itemRef;
	protected final String type;
	protected final UUID id;

	public SimpleCollectionRef(EntityRef ownerRef, String collectionName,
			EntityRef itemRef) {
		this.ownerRef = ownerRef;
		this.collectionName = collectionName;
		this.itemRef = itemRef;
		type = itemRef.getType() + ":" + MEMBER_ENTITY_TYPE;
		id = CassandraPersistenceUtils.keyID(ownerRef.getUuid(), collectionName, itemRef.getUuid());
	}

	@Override
	public EntityRef getOwnerEntity() {
		return ownerRef;
	}

	@Override
	public String getCollectionName() {
		return collectionName;
	}

	@Override
	public EntityRef getItemRef() {
		return itemRef;
	}

	@Override
	public UUID getUuid() {
		return id;
	}

	@Override
	public String getType() {
		return type;
	}

	@Override
	public String toString() {
		if ((type == null) && (id == null)) {
			return "CollectionRef(" + SimpleEntityRef.NULL_ID.toString() + ")";
		}
		if (type == null) {
			return "CollectionRef(" + id.toString() + ")";
		}
		return type + "(" + id + "," + ownerRef + "," + collectionName + ","
				+ itemRef + ")";
	}
}