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// --- BEGIN COPYRIGHT BLOCK ---
// 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 2 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.certsrv.evaluators;
import java.util.*;
import java.security.*;
import com.netscape.certsrv.base.*;
import com.netscape.certsrv.authentication.*;
/**
* A class represents an evaluator. An evaluator is used to
* evaluate an expression. For example, one can write an evaluator to
* evaluate if a user belongs to a certain group. An evaluator is
* generally used for access control expression evaluation, however, it
* can be used for other evaluation-related operations.
* <P>
*
* @version $Revision$, $Date$
*/
public interface IAccessEvaluator {
/**
* Initialize the evaluator
*/
public void init();
/**
* Gets the type of the evaluator. Type is defined by each
* evaluator plugin. Each evaluator plugin should have a unique type.
* @return type of the evaluator
*/
public String getType();
/**
* Gets the description of the evaluator
* @return a text description for this evaluator
*/
public String getDescription();
/**
* Evaluates if the given value satisfies the access
* control in current context.
* @param type Type of the evaluator, eg, user, group etc
* @param op Operator of the evaluator, eg, =, !=
* @param value Part of the expression that can be used to
* evaluate, e.g, value can be the name of the group if the
* purpose of the evaluator is to evaluate if the user is a member
* of the group.
* @return true if the evaluation expression is matched; false otherwise.
*/
public boolean evaluate(String type, String op, String value);
/**
* Evaluates if the given value satisfies the access
* control in authToken obtained from Authentication.
* @param authToken Authentication token
* @param type Type of the evaluator, eg, user, group etc
* @param op Operator of the evaluator, eg, =, !=
* @param value Part of the expression that can be used to
* evaluate, e.g, value can be the name of the group if the
* purpose of the evaluator is to evaluate if the user is a member
* of the group.
* @return true if the evaluation expression is matched; false otherwise.
*/
public boolean evaluate(IAuthToken authToken, String type, String op, String value);
/**
* Get the supported operators for this evaluator
* @return Supported operators in string array
*/
public String[] getSupportedOperators();
}
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