public class CachedValue {
  private DependentList list;
  private int last_computed;
  private java.lang.Object value;
  public CachedValue(ASTNode home, java.lang.Object value) {
    super();
    this.list = DependentList.emptyDependentList;
    this.last_computed = home.getCacheRoot().getLastFlushed();
    this.value = value;
  }
  public java.lang.Object getValue() {
    return value;
  }
  public void setValue(ASTNode home, java.lang.Object value) {
    this.last_computed = home.getCacheRoot().getLastFlushed();
    Object before = this.value;
    this.value = value;
    if(this.value == null ? before != null : !this.value.equals(before))
      propagate(home);
    else
      this.value = before;
  }
  public void addDependent(Caching.CacheRoot dep) {
    list = list.add(dep);
  }
  public void propagate(ASTNode home) {
    list.propagate(home);
  }
  public int last_computed() {
    return last_computed;
  }
  public boolean hasExternalDependents(ASTNode home) {
    return !list.isEmpty(home);
  }
}