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/* Copyright 2004, 2005 Acegi Technology Pty Limited
 *
 * 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.acegisecurity.vote;

import org.acegisecurity.AccessDeniedException;
import org.acegisecurity.Authentication;
import org.acegisecurity.ConfigAttributeDefinition;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.Iterator;


/**
 * Simple concrete implementation of  {@link
 * org.acegisecurity.AccessDecisionManager} that grants access if any
 * AccessDecisionVoter returns an affirmative response.
 */
public class AffirmativeBased extends AbstractAccessDecisionManager {
    //~ Static fields/initializers =============================================

    private static final Log logger = LogFactory.getLog(AffirmativeBased.class);

    //~ Methods ================================================================

    /**
     * This concrete implementation simply polls all configured  {@link
     * AccessDecisionVoter}s and grants access if any
     * AccessDecisionVoter voted affirmatively. Denies access
     * only if there was a deny vote AND no affirmative votes.
     * 
     * 
     * If every AccessDecisionVoter abstained from voting, the
     * decision will be based on the {@link #isAllowIfAllAbstainDecisions()}
     * property (defaults to false).
     * 
     *
     * @param authentication the caller invoking the method
     * @param object the secured object
     * @param config the configuration attributes associated with the method
     *        being invoked
     *
     * @throws AccessDeniedException if access is denied
     */
    public void decide(Authentication authentication, Object object,
        ConfigAttributeDefinition config) throws AccessDeniedException {
        Iterator iter = this.getDecisionVoters().iterator();
        int deny = 0;

        while (iter.hasNext()) {
            AccessDecisionVoter voter = (AccessDecisionVoter) iter.next();
            int result = voter.vote(authentication, object, config);

            switch (result) {
            case AccessDecisionVoter.ACCESS_GRANTED:
                return;

            case AccessDecisionVoter.ACCESS_DENIED:
                deny++;

                break;

            default:
                break;
            }
        }

        if (deny > 0) {
            throw new AccessDeniedException(messages.getMessage(
                    "AbstractAccessDecisionManager.accessDenied",
                    "Access is denied"));
        }

        // To get this far, every AccessDecisionVoter abstained
        if (this.isAllowIfAllAbstainDecisions()) {
            return;
        } else {
            throw new AccessDeniedException(messages.getMessage(
                    "AbstractAccessDecisionManager.accessDenied",
                    "Access is denied"));
        }
    }
}