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package org.robolectric.util;

import java.lang.ref.SoftReference;

/**
 * Soft reference to a {@code java.lang.ThreadLocal}.
 *
 * @param  The referent to track.
 */
public abstract class SoftThreadLocal {

  @SuppressWarnings({"AndroidJdkLibsChecker", "NewApi"})
  private final ThreadLocal> threadLocal =
      ThreadLocal.withInitial(() -> new SoftReference<>(create()));

  public synchronized T get() {
    T item = threadLocal.get().get();
    if (item == null) {
      item = create();
      threadLocal.set(new SoftReference<>(item));
    }
    return item;
  }

  public void set(T item) {
    threadLocal.set(new SoftReference<>(item));
  }

  protected abstract T create();
}