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Implementation of operational transformation technology. Allows building collaborative software systems.

There is a newer version: 6.0-rc2

/*
 * Copyright (C) 2020 ActiveJ LLC.
 *
 * 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 io.activej.ot;

import io.activej.promise.Promise;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.function.ToLongFunction;

import static io.activej.common.Utils.keysToMap;
import static java.util.Collections.singletonMap;

public interface OTCommitFactory {
	final class DiffsWithLevel {
		private final long level;
		private final List diffs;

		public DiffsWithLevel(long level, List diffs) {
			this.level = level;
			this.diffs = diffs;
		}

		public long getLevel() {
			return level;
		}

		public List getDiffs() {
			return diffs;
		}
	}

	Promise> createCommit(Map> parentDiffs);

	default Promise> createCommit(K parent, DiffsWithLevel parentDiff) {
		return createCommit(singletonMap(parent, parentDiff));
	}

	default Promise> createCommit(Set parents, Function> diffs, ToLongFunction level) {
		return createCommit(keysToMap(parents.stream(), parent -> new DiffsWithLevel<>(level.applyAsLong(parent), diffs.apply(parent))));
	}

	default Promise> createCommit(K parent, List diffs, long level) {
		return createCommit(parent, new DiffsWithLevel<>(level, diffs));
	}
}