com.flaptor.indextank.index.scorer.FacetingManager.java Source code

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Here is the source code for com.flaptor.indextank.index.scorer.FacetingManager.java

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/*
 * Copyright (c) 2011 LinkedIn, Inc
 * 
 * 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 com.flaptor.indextank.index.scorer;

import java.util.Map;
import java.util.Set;

import com.google.common.collect.HashMultiset;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;

public abstract class FacetingManager {
    public abstract Faceter createFaceter();

    public abstract MatchFilter getFacetFilter(Multimap<String, String> filteringFacets);

    public static Map<String, Multiset<String>> mergeFacets(Map<String, Multiset<String>> facets1,
            Map<String, Multiset<String>> facets2) {
        Map<String, Multiset<String>> result = Maps.newHashMap();

        Set<String> facets1Cats = facets1.keySet();

        for (String category : facets1Cats) {
            Multiset<String> facet1 = HashMultiset.create(facets1.get(category));
            Multiset<String> facet2 = facets2.get(category);

            if (facet2 != null) {
                facet1.addAll(facet2);
            }
            result.put(category, facet1);
        }

        Set<String> facets2Cats = facets2.keySet();

        for (String category : facets2Cats) {
            if (!result.containsKey(category)) {
                result.put(category, HashMultiset.create(facets2.get(category)));
            }
        }

        return result;
    }
}