com.github.elibracha.compare.ReferenceDiffCache Maven / Gradle / Ivy

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package com.github.elibracha.compare;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;

import com.github.elibracha.model.DiffContext;

/** Created by adarsh.sharma on 07/01/18. */
public abstract class ReferenceDiffCache {
  private Map refDiffMap;

  public ReferenceDiffCache() {
    this.refDiffMap = new HashMap<>();
  }

  private Optional getFromCache(CacheKey cacheKey) {
    return Optional.ofNullable(refDiffMap.get(cacheKey));
  }

  private void addToCache(CacheKey cacheKey, D changed) {
    refDiffMap.put(cacheKey, changed);
  }

  public Optional cachedDiff(
      HashSet refSet,
      C left,
      C right,
      String leftRef,
      String rightRef,
      DiffContext context) {
    boolean areBothRefParameters = leftRef != null && rightRef != null;
    if (areBothRefParameters) {
      CacheKey key = new CacheKey(leftRef, rightRef, context);
      Optional changedFromRef = getFromCache(key);
      if (changedFromRef.isPresent()) {
        return changedFromRef;
      } else {
        String refKey = getRefKey(leftRef, rightRef);
        if (refSet.contains(refKey)) {
          return Optional.empty();
        } else {
          refSet.add(refKey);
          Optional changed = computeDiff(refSet, left, right, context);
          addToCache(key, changed.orElse(null));
          refSet.remove(refKey);
          return changed;
        }
      }
    } else {
      return computeDiff(refSet, left, right, context);
    }
  }

  protected String getRefKey(String leftRef, String rightRef) {
    return leftRef + ":" + rightRef;
  }

  protected abstract Optional computeDiff(
      HashSet refSet, C left, C right, DiffContext context);
}