/*
 * (c) Copyright 2020 Palantir Technologies Inc. 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.
 */

package com.palantir.timelock.history.util;

import com.palantir.logsafe.Preconditions;
import com.palantir.logsafe.SafeArg;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class UseCaseUtils {
    private static final Pattern PATTERN = Pattern.compile("^(.*)!(.*)$");

    private UseCaseUtils() {
        // no op
    }

    public static String getPaxosUseCasePrefix(String useCase) {
        Matcher matcher = PATTERN.matcher(useCase);
        Preconditions.checkState(matcher.find(), "Unexpected use case format", SafeArg.of("useCase", useCase));
        return matcher.group(1);
    }
}
