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/*
 * Copyright 2018 the original author or authors.
 *
 * 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.gradle.vcs.internal;

import org.gradle.vcs.VersionControlSpec;

import javax.annotation.Nullable;
import java.io.File;
import java.util.Set;

/**
 * Allows the user to perform generic version control operations in ways
 * specified by the underlying implementations.
 */
public interface VersionControlSystem {
    /**
     * Returns a {@link Set} of {@link VersionRef}s representing
     * versions of a software package as they are known to the version
     * control system.
     */
    Set getAvailableVersions(VersionControlSpec spec);

    /**
     * Populates a working directory with the given version from the version control repository from the {@code spec}.
     *
     * This should reset any changes in the working directory, if it exists.
     */
    void populate(File workingDir, VersionRef ref, VersionControlSpec spec);

    /**
     * Returns the default revision for this VCS.
     */
    VersionRef getDefaultBranch(VersionControlSpec spec);

    /**
     * Returns the given branch or null.
     */
    @Nullable
    VersionRef getBranch(VersionControlSpec spec, String branch);
}