/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
 * ===========================================================================
 * 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.
 * ============LICENSE_END====================================================
 *
 */

package org.onap.aaf.cadi.taf;

import java.io.IOException;

import org.onap.aaf.cadi.Access;
import org.onap.aaf.cadi.principal.TaggedPrincipal;

/**
 * A Null Pattern for setting responses to "Deny" before configuration is setup.
 * @author Jonathan
 *
 */
class NullTafResp implements TafResp {
    private NullTafResp(){}
    
    private static TafResp singleton = new NullTafResp();
    
    public static TafResp singleton() {
        return singleton;
    }
    
    public boolean isValid() {
        return false;
    }
    
    public RESP isAuthenticated() {
        return RESP.NO_FURTHER_PROCESSING;
    }
    
    public String desc() {
        return "All Authentication denied";
    }
    
    public RESP authenticate() throws IOException {
        return RESP.NO_FURTHER_PROCESSING;
    }

    public TaggedPrincipal getPrincipal() {
        return null;
    }

    /* (non-Javadoc)
	 * @see org.onap.aaf.cadi.taf.TafResp#getTarget()
	 */
	@Override
	public String getTarget() {
		return "unknown";
	}

	public Access getAccess() {
        return Access.NULL;
    }

    /* (non-Javadoc)
     * @see org.onap.aaf.cadi.taf.TafResp#isFailedAttempt()
     */
    public boolean isFailedAttempt() {
        return true;
    }

    @Override
    public float timing() {
        return 0;
    }

    @Override
    public void timing(long start) {
    }
    
    @Override
    public String taf() {
        return "NULL";
    }

}