/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */

/**
 * @author Vera Y. Petrashkova
 */

package org.apache.harmony.security.tests.support.cert;

import java.security.InvalidAlgorithmParameterException;
import java.security.cert.CertPathBuilderException;
import java.security.cert.CertPathBuilderResult;
import java.security.cert.CertPathBuilderSpi;
import java.security.cert.CertPathParameters;

/**
 * Additional class for verification CertPathBuilderSpi
 * and CertPathBuilder
 */

public class MyCertPathBuilderSpi extends CertPathBuilderSpi {
    private int swi = 0;

    public CertPathBuilderResult engineBuild(CertPathParameters params)
            throws CertPathBuilderException, InvalidAlgorithmParameterException {
        swi++;
        if ((params == null) && ((swi % 2) != 0)) {
            throw new CertPathBuilderException("Null parameter");
        }
        return null;
    }
}