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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.springframework.util.Assert;
import org.usergrid.persistence.cassandra.CassandraPersistenceUtils;
import org.usergrid.persistence.entities.Group;
import org.usergrid.utils.StringUtils;
import org.usergrid.utils.UUIDUtils;

public class SimpleRoleRef implements RoleRef {

	protected final UUID groupId;
	protected final String roleName;
	protected final UUID id;

	public SimpleRoleRef(String roleName) {
		this(null, roleName);
	}

	public SimpleRoleRef(UUID groupId, String roleName) {
	    Assert.notNull(roleName);
		if (groupId != null) {
			this.groupId = groupId;
		} else {
			this.groupId = UUIDUtils.tryExtractUUID(roleName);
		}
		this.roleName = StringUtils.stringOrSubstringAfterLast(
				roleName.toLowerCase(), ':');
		if (groupId == null) {
			id = CassandraPersistenceUtils.keyID("role", this.groupId, this.roleName);
		} else {
			id = CassandraPersistenceUtils.keyID("role", this.roleName);
		}
	}

	public static SimpleRoleRef forRoleEntity(Entity role) {
		if (role == null) {
			return null;
		}
		UUID groupId = (UUID) role.getProperty("group");
		String name = role.getName();
		return new SimpleRoleRef(groupId, name);
	}

	public static SimpleRoleRef forRoleName(String roleName) {
		return new SimpleRoleRef(null, roleName);
	}

	public static SimpleRoleRef forGroupIdAndRoleName(UUID groupId,
			String roleName) {
		return new SimpleRoleRef(groupId, roleName);
	}

	public static UUID getIdForRoleName(String roleName) {
		return forRoleName(roleName).getUuid();
	}

	public static UUID getIdForGroupIdAndRoleName(UUID groupId, String roleName) {
		return forGroupIdAndRoleName(groupId, roleName).getUuid();
	}

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

	@Override
	public String getType() {
		return "role";
	}

	@Override
	public EntityRef getGroupRef() {
		return new SimpleEntityRef(Group.ENTITY_TYPE, groupId);
	}

	@Override
	public String getRoleName() {
		return roleName;
	}

	@Override
	public UUID getGroupId() {
		return groupId;
	}

	@Override
	public String getApplicationRoleName() {
		if (groupId == null) {
			return roleName;
		}
		return groupId + ":" + roleName;
	}

}