code: package zemberek.morphology.lexicon;
  
  import com.google.common.base.Stopwatch;
  import com.google.common.collect.HashMultimap;
  import com.google.common.collect.Lists;
  import com.google.common.collect.Maps;
  import com.google.common.collect.Multimap;
  import com.google.common.collect.Sets;
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  import zemberek.core.logging.Log;
  import zemberek.core.text.TextIO;
  import zemberek.core.turkish.PrimaryPos;
  import zemberek.morphology.lexicon.tr.TurkishDictionaryLoader;
  
  /**
   * This is the collection of all Dictionary Items.
   */
  public class RootLexicon implements Iterable<DictionaryItem> {
  
    private static final int INITIAL_CAPACITY = 1000;
  
    private enum Singleton {
      Instance;
      RootLexicon defaultLexicon = defaultBinaryLexicon();
    }
  
    public static RootLexicon getDefault() {
      return Singleton.Instance.defaultLexicon;
    }
  
    private Multimap<String, DictionaryItem> itemMap = HashMultimap.create(INITIAL_CAPACITY, 1);
    private Map<String, DictionaryItem> idMap = new HashMap<>(INITIAL_CAPACITY);
    private Set<DictionaryItem> itemSet = new LinkedHashSet<>(INITIAL_CAPACITY);
  
    public RootLexicon(List<DictionaryItem> dictionaryItems) {
      for (DictionaryItem dictionaryItem : dictionaryItems) {
        add(dictionaryItem);
      }
    }
  
    public RootLexicon() {
    }
  
    public void add(DictionaryItem item) {
      if (itemSet.contains(item)) {
        Log.warn("Duplicated item:" + item);
        return;
      }
      if (idMap.containsKey(item.id)) {
        Log.warn("Duplicated item id of:" + item + " with " + idMap.get(item.id));
        return;
      }
      this.itemSet.add(item);
      idMap.put(item.id, item);
      itemMap.put(item.lemma, item);
    }
  
    public void addAll(Iterable<DictionaryItem> items) {
      for (DictionaryItem item : items) {
        add(item);
      }
    }
  
    public Collection<DictionaryItem> getAllItems() {
      return itemMap.values();
    }
  
    public List<DictionaryItem> getMatchingItems(String lemma) {
      Collection<DictionaryItem> items = itemMap.get(lemma);
      if (items == null) {
        return Collections.emptyList();
      } else {
        return Lists.newArrayList(items);
      }
    }
  
    public void remove(DictionaryItem item) {
      itemMap.get(item.lemma).remove(item);
      idMap.remove(item.id);
      itemSet.remove(item);
    }
  
    public void removeAllLemmas(String lemma) {
      for (DictionaryItem item : getMatchingItems(lemma)) {
        remove(item);
      }
    }
  
    public void removeAllLemmas(Iterable<String> lemmas) {
      for (String lemma : lemmas) {
        removeAllLemmas(lemma);
      }
    }
  
    public void removeAll(Iterable<DictionaryItem> items) {
      for (DictionaryItem item : items) {
        remove(item);
      }
    }
  
    public boolean containsItem(DictionaryItem item) {
      return itemSet.contains(item);
    }
  
    public DictionaryItem getItemById(String id) {
      return idMap.get(id);
    }
  
    public List<DictionaryItem> getMatchingItems(String lemma, PrimaryPos pos) {
      Collection<DictionaryItem> items = itemMap.get(lemma);
      if (items == null) {
        return Collections.emptyList();
      }
      List<DictionaryItem> matches = Lists.newArrayListWithCapacity(1);
      for (DictionaryItem item : items) {
        if (item.primaryPos == pos) {
          matches.add(item);
        }
      }
      return matches;
    }
  
    public static RootLexicon fromLines(String... lines) {
      return builder().addDictionaryLines(lines).build();
    }
  
    public static RootLexicon fromResources(String... resources) throws IOException {
      return builder().addTextDictionaryResources(resources).build();
    }
  
    public static RootLexicon fromResources(Collection<String> resources) throws IOException {
      return builder().addTextDictionaryResources(resources).build();
    }
  
    public boolean isEmpty() {
      return itemSet.isEmpty();
    }
  
    public int size() {
      return itemSet.size();
    }
  
    @Override
    public Iterator<DictionaryItem> iterator() {
      return itemSet.iterator();
    }
  
    public static Builder builder() {
      return new Builder();
    }
  
    public static class Builder {
  
      RootLexicon lexicon = new RootLexicon();
  
      public Builder addBinaryDictionary(Path dictionaryPath) throws IOException {
        lexicon.addAll(DictionarySerializer.load(dictionaryPath).getAllItems());
        return this;
      }
  
      public Builder addDefaultLexicon() {
        if(lexicon.size()==0) {
          lexicon = getDefault();
        } else {
          addLexicon(getDefault());
        }
        return this;
      }
  
      public Builder setLexicon(RootLexicon lexicon) {
        this.lexicon = lexicon;
        return this;
      }
  
      public Builder addLexicon(RootLexicon lexicon) {
        this.lexicon.addAll(lexicon.getAllItems());
        return this;
      }
  
      public Builder addTextDictionaries(File... dictionaryFiles) throws IOException {
        List<String> lines = new ArrayList<>();
        for (File file : dictionaryFiles) {
          lines.addAll(Files.readAllLines(file.toPath()));
        }
        lexicon.addAll(TurkishDictionaryLoader.load(lines));
        return this;
      }
  
      public Builder addTextDictionaries(Path... dictionaryPaths) throws IOException {
        for (Path dictionaryPath : dictionaryPaths) {
          addTextDictionaries(dictionaryPath.toFile());
        }
        return this;
      }
  
      public Builder addDictionaryLines(String... lines) {
        lexicon.addAll(TurkishDictionaryLoader.load(lines));
        return this;
      }
  
      public Builder removeDictionaryFiles(File... dictionaryFiles) throws IOException {
        for (File file : dictionaryFiles) {
          lexicon.removeAll(TurkishDictionaryLoader.load(file));
        }
        return this;
      }
  
      public Builder addTextDictionaryResources(Collection<String> resources) throws IOException {
        Log.info("Dictionaries :%s", String.join(", ", resources));
        List<String> lines = new ArrayList<>();
        for (String resource : resources) {
          lines.addAll(TextIO.loadLinesFromResource(resource));
        }
        lexicon.addAll(TurkishDictionaryLoader.load(lines));
        return this;
      }
  
      public Builder addTextDictionaryResources(String... resources) throws IOException {
        return addTextDictionaryResources(Arrays.asList(resources));
      }
  
      public Builder removeItems(Iterable<String> dictionaryString) {
        lexicon.removeAll(TurkishDictionaryLoader.load(dictionaryString));
        return this;
      }
  
      public Builder removeAllLemmas(Iterable<String> lemmas) {
        lexicon.removeAllLemmas(lemmas);
        return this;
      }
  
      public Builder addDictionaryLines(Collection<String> lines) {
        lexicon.addAll(TurkishDictionaryLoader.load(lines));
        return this;
      }
  
      public RootLexicon build() {
        return lexicon;
      }
    }
  
    private static RootLexicon defaultBinaryLexicon() {
      try {
        Stopwatch stopwatch = Stopwatch.createStarted();
        RootLexicon lexicon = DictionarySerializer.loadFromResources("/tr/lexicon.bin");
        Log.info("Dictionary generated in %d ms", stopwatch.elapsed(TimeUnit.MILLISECONDS));
        return lexicon;
      } catch (IOException e) {
        throw new RuntimeException(
            "Cannot load default binary dictionary. Reason:" + e.getMessage(), e);
      }
    }
  }
  