org.nlpub.watset.graph.EmptyClustering Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of watset Show documentation

An open source implementation of the Watset algorithm for fuzzy graph clustering.

There is a newer version: 2.8.2

/*
 * Copyright 2018 Dmitry Ustalov
 *
 * 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.nlpub.watset.graph;

import org.jgrapht.Graph;
import org.jgrapht.alg.interfaces.ClusteringAlgorithm;

import java.util.Collections;

import static java.util.Objects.requireNonNull;

/**
 * A trivial clustering algorithm that returns no clusters.
 *
 * @param  the type of nodes in the graph
 */
public class EmptyClustering implements ClusteringAlgorithm {
    /**
     * Builder for {@link EmptyClustering}.
     *
     * @param  the type of nodes in the graph
     * @param  the type of edges in the graph
     */
    @SuppressWarnings({"unused", "UnusedReturnValue"})
    public static class Builder implements ClusteringAlgorithmBuilder> {
        @Override
        public EmptyClustering apply(Graph graph) {
            requireNonNull(graph);
            return new EmptyClustering<>();
        }
    }

    /**
     * Create a builder.
     *
     * @param  the type of nodes in the graph
     * @param  the type of edges in the graph
     * @return a builder
     */
    public static  Builder builder() {
        return new Builder<>();
    }

    @Override
    public Clustering getClustering() {
        return new ClusteringImpl<>(Collections.emptyList());
    }
}