com.intuit.quickbase.MergeStatService.java Source code

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Here is the source code for com.intuit.quickbase.MergeStatService.java

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package com.intuit.quickbase;

import com.intuit.quickbase.devint.ConcreteStatService;
import com.intuit.quickbase.devint.DBStatService;
import java.util.Collection;
import java.util.List;
import java.util.stream.Stream;
import org.apache.commons.lang3.tuple.Pair;
import java.util.*;
import java.util.function.Predicate;
import java.util.stream.*;
import org.apache.commons.lang3.tuple.ImmutablePair;

/**
 *
 * @author hpanjwani
 */

public class MergeStatService {

    public void retrieveCountryPopulationList() {

        DBStatService dbStatService = new DBStatService();
        List<Pair<String, Integer>> dbList = dbStatService.GetCountryPopulations();

        ConcreteStatService conStatService = new ConcreteStatService();
        List<Pair<String, Integer>> apiList = conStatService.GetCountryPopulations();

        //Use of Predicate Interface
        Predicate<Pair<String, Integer>> pred = (pair) -> pair != null;

        if (apiList != null) {
            // Converting the keys of each element in the API list to lowercase
            List<Pair<String, Integer>> modifiedAPIList = apiList.stream().filter(pred)
                    .map(p -> new ImmutablePair<String, Integer>(p.getKey().toLowerCase(), p.getValue()))
                    .collect(Collectors.toList());
            //modifiedAPIList.forEach(pair -> System.out.println("key: " + pair.getLeft() + ": value: " + pair.getRight()));                      

            if (dbList != null) {
                // Merge two list and remove duplicates
                Collection<Pair<String, Integer>> result = Stream.concat(dbList.stream(), modifiedAPIList.stream())
                        .filter(pred)
                        .collect(Collectors.toMap(Pair::getLeft, p -> p, (p, q) -> p, LinkedHashMap::new)).values();

                // Need to Convert collection to List
                List<Pair<String, Integer>> merge = new ArrayList<>(result);
                merge.forEach(pair -> System.out.println("key: " + pair.getKey() + ": value: " + pair.getValue()));

            } else {
                System.out.println("Country list retrieved form database is empty");
            }
        } else {
            System.out.println("Country list retrieved form API is empty");
        }

        //            if(apiList != null) {
        //                Iterator itr = apiList.iterator();
        //                for(Pair<String, Integer> pair : apiList){                    
        //                    //System.out.println("key: " + pair.getLeft() + ": value: " + pair.getRight());
        //                }                
        //            }    

    }
}