asterixdb/asterix-fuzzyjoin/src/main/java/org/apache/asterix/fuzzyjoin/tokenorder/TokenRankFrequency.java

/**
 * 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 org.apache.asterix.fuzzyjoin.tokenorder;

import java.util.Collection;
import java.util.HashMap;
import java.util.TreeSet;

public class TokenRankFrequency implements TokenRank {
    /**
     *
     */
    private static final long serialVersionUID = 1L;

    private final HashMap<String, Integer> ranksMap = new HashMap<String, Integer>();
    private int crtRank = 0;

    public int add(String token) {
        int prevRank = crtRank;
        ranksMap.put(token, prevRank);
        crtRank++;
        return prevRank;
    }

    public Integer getRank(String token) {
        return ranksMap.get(token);
    }

    public Collection<Integer> getTokenRanks(Iterable<String> tokens) {
        TreeSet<Integer> ranksCol = new TreeSet<Integer>();
        for (String token : tokens) {
            Integer rank = getRank(token);
            if (rank != null) {
                ranksCol.add(rank);
            }
        }
        return ranksCol;
    }

    @Override
    public String toString() {
        return "[" + crtRank + ",\n " + ranksMap + "\n]";
    }
}