storm.benchmark.lib.reducer.SetReducer.java Source code

Introduction

Here is the source code for storm.benchmark.lib.reducer.SetReducer.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 storm.benchmark.lib.reducer;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

import java.util.Set;

public class SetReducer<T> implements Reducer<Set<T>> {

    private static final long serialVersionUID = -5236751818829417995L;

    @Override
    public Set<T> reduce(Set<T> v1, Set<T> v2) {
        return Sets.union(v1, v2);
    }

    @Override
    public Set<T> zero() {
        return ImmutableSet.of();
    }

    @Override
    public boolean isZero(Set<T> ts) {
        return ts.isEmpty();
    }
}