/*************************************************************************
* Copyright 2009-2012 Eucalyptus Systems, Inc.
*
* 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; version 3 of the License.
*
* 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, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
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************************************************************************/
package com.eucalyptus.auth.policy.key;
import com.eucalyptus.auth.AuthException;
import com.eucalyptus.auth.Contract;
/**
* Keys specifying a contract for resource usage or result presentation once an
* authorization statement approves the request, e.g. instance lifetime, s3 max-key, etc.
*/
public abstract class ContractKey<T> implements Key {
/**
* Get a contract object by input values from the policy spec.
*
* @param values The input values.
* @return A contract object.
*/
public abstract Contract<T> getContract( String[] values );
/**
* Check if another contract is better than the current one. The exact "betterness"
* is defined by specific key type.
*
* @param current The current contract.
* @param update The new contract.
* @return If new contract is better than the current one.
*/
public abstract boolean isBetter( Contract<T> current, Contract<T> update );
@Override
public final String value( ) throws AuthException {
throw new RuntimeException( "ContractKey has no value." );
}
}