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/*
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * Apache-2.0 license and offer limited warranties, support, maintenance, and
 * commercial database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
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 */
package org.jooq;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.ApiStatus.Experimental;

/**
 * A directed, acyclic graph of {@link Version} objects.
 * 
 * The graph is exposed as {@link Iterable} in no defined iteration order.
 * 
 * This is EXPERIMENTAL functionality and subject to change in future jOOQ
 * versions.
 *
 * @author Lukas Eder
 */
@Experimental
public interface Versions extends Iterable {

    /**
     * The root version of this graph.
     */
    @NotNull
    Version root();

    /**
     * Find a version by its id, or null, if no such version was
     * found.
     */
    @Nullable
    Version get(String id);
}