/*
 * 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.
 */
package org.netbeans.modules.autoupdate.services;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.netbeans.modules.autoupdate.updateprovider.MessageDigestValue;
import static org.netbeans.modules.autoupdate.services.Utilities.hexDecode;

public interface MessageValidator {
    static Logger LOG = Logger.getLogger(MessageValidator.class.getName());

    static MessageMultiValidator createFromMessageDigestValues(Collection<MessageDigestValue> messageDigestValue) {
        List<MessageValidator> validatorList = new ArrayList<>();
        for (MessageDigestValue h : messageDigestValue) {
            try {
                MessageDigest md = MessageDigest.getInstance(h.getAlgorithm());
                validatorList.add(new MessageDigestValidator(md, hexDecode(h.getValue())));
            } catch (NoSuchAlgorithmException ex) {
                LOG.log(Level.FINE, "Unsupported Hash Algorithm: {0}", h.getAlgorithm());
            }
        }
        return new MessageMultiValidator(validatorList);
    }

    public void update(byte[] input, int offset, int len);

    public void update(byte[] input);

    public void update(byte input);

    public void reset();

    public boolean isValid();

    public String getName();

    public String getExpectedValueAsString();

    public String getRealValueAsString();
}
