@Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; InMemoryLookupCache that = (InMemoryLookupCache) o; if (numDocs != that.numDocs) return false; if (wordIndex != null ? !wordIndex.equals(that.wordIndex) : that.wordIndex != null) return false; if (wordFrequencies != null ? !wordFrequencies.equals(that.wordFrequencies) : that.wordFrequencies != null) return false; if (docFrequencies != null ? !docFrequencies.equals(that.docFrequencies) : that.docFrequencies != null) return false; if (vocabWords().equals(that.vocabWords())) return true; return true; }