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Genome Damage and Stability Centre SMLM Package Software for single molecule localisation microscopy (SMLM)

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/*-
 * #%L
 * Genome Damage and Stability Centre SMLM Package
 *
 * Software for single molecule localisation microscopy (SMLM)
 * %%
 * Copyright (C) 2011 - 2023 Alex Herbert
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

package uk.ac.sussex.gdsc.smlm.results;

import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
import uk.ac.sussex.gdsc.smlm.results.predicates.FramePeakResultPredicate;
import uk.ac.sussex.gdsc.smlm.results.predicates.IdPeakResultPredicate;

/**
 * Provides a cache of the view of the results.
 */
public class CachedPeakResultView implements PeakResultView {
  private final PeakResultStore store;

  private Int2ObjectOpenHashMap frameMap;
  private Int2ObjectOpenHashMap idMap;

  /**
   * Instantiates a new cached peak result view.
   *
   * @param store the store
   */
  public CachedPeakResultView(PeakResultStore store) {
    this.store = store;
  }

  /**
   * Gets the results by frame.
   *
   * @param frame the frame
   * @return the results
   */
  @Override
  public PeakResult[] getResultsByFrame(int frame) {
    if (frameMap == null) {
      frameMap = new Int2ObjectOpenHashMap<>();
    }
    return frameMap.computeIfAbsent(frame, i -> store.subset(new FramePeakResultPredicate(i)));
  }

  /**
   * Gets the results by id.
   *
   * @param id the id
   * @return the results
   */
  @Override
  public PeakResult[] getResultsById(int id) {
    if (idMap == null) {
      idMap = new Int2ObjectOpenHashMap<>();
    }
    return idMap.computeIfAbsent(id, i -> store.subset(new IdPeakResultPredicate(i)));
  }

  /**
   * Clear the cache.
   */
  public void clear() {
    if (frameMap != null) {
      frameMap.clear();
    }
    if (idMap != null) {
      idMap.clear();
    }
  }
}