Class Stores

basex-core/src/main/java/org/basex/core/Stores.java:26–433

This class provides access to main-memory key/value stores. @author BaseX Team, BSD License @author Christian Gruen

 * @author Christian Gruen
 */
public final class Stores implements Closeable {
  /** Name of store files. */
  private static final String NAME = "store";

  /** Stores. */
  private final HashMap<String, Store> stores = new HashMap<>();
  /** Database context. */
  private final Context context;

  /**
   * Constructor.
   * @param context database context
   */
  public Stores(final Context context) {
    this.context = context;
  }

  /**
   * Returns all keys.
   * @param name name of store
   * @param info input info
   * @param qc query context
   * @return keys
   * @throws QueryException query exception
   */
  public synchronized Value keys(final String name, final InputInfo info, final QueryContext qc)
      throws QueryException {
    final Store store = get(name, false, info, qc);
    if(store != null) {
      final TokenList list = new TokenList(store.map.size());
      for(final String key : store.map.keySet()) list.add(key);
      return StrSeq.get(list);
    }
    return Empty.VALUE;
  }

  /**
   * Returns a value.
   * @param key key
   * @param name name of store
   * @param info input info
   * @param qc query context
   * @return value or empty sequence
   * @throws QueryException query exception
   */
  public synchronized Value get(final String key, final String name, final InputInfo info,
      final QueryContext qc) throws QueryException {
    final Store store = get(name, false, info, qc);
    if(store != null) {
      final Value value = store.map.get(key);
      if(value != null) return value;
    }
    return Empty.VALUE;
  }

  /**
   * Stores a value.
   * @param key key