uk.co.flax.luwak.termextractor.weights.MinWeightCombiner Maven / Gradle / Ivy

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package uk.co.flax.luwak.termextractor.weights;

/*
 * Copyright (c) 2014 Lemur Consulting Ltd.
 * 
 * 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.
 */

import java.util.Collection;

import uk.co.flax.luwak.termextractor.querytree.QueryTree;
import uk.co.flax.luwak.termextractor.querytree.TreeWeightor;

/**
 * Returns the minimum weight of a list of {@link QueryTree}s as the final weight
 */
public class MinWeightCombiner implements CombinePolicy {

    @Override
    public float combine(TreeWeightor weightor, Collection children) {

        if (children.size() == 0)
            return 0;

        float min = Float.MAX_VALUE;
        for (QueryTree child : children) {
            min = Math.min(min, child.weight(weightor));
        }
        return min;

    }
}