Class StaticScope

basex-core/src/main/java/org/basex/query/scope/StaticScope.java:24–123

Superclass for static functions, variables and the main expression. @author BaseX Team, BSD License @author Leo Woerteler

 * @author Leo Woerteler
 */
public abstract class StaticScope extends ExprInfo implements Scope {
  /** Static context. */
  public final StaticContext sc;

  /** Expression of this declaration ({@code null} if this is an external function). */
  public Expr expr;
  /** Resulting value (can be {@code null}). */
  public Value value;

  /** Input info (can be {@code null}). */
  public InputInfo info;
  /** Name of the scope (can be {@code null}). */
  public QNm name;

  /** Variable scope. */
  protected VarScope vs;
  /** Compilation flag. */
  protected boolean compiled;

  /** Declared type, {@code null} if not specified. */
  protected SeqType declType;

  /** Documentation string. */
  private byte[] doc = Token.EMPTY;

  /**
   * Constructor.
   * @param sc static context
   */
  StaticScope(final StaticContext sc) {
    this.sc = sc;
  }

  /**
   * Assigns a documentation string.
   * @param string xqdoc string (can be {@code null})
   */
  public void doc(final String string) {
    if(string != null) doc = Token.token(string.trim());
  }

  @Override
  public final boolean compiled() {
    return compiled;
  }

  /**
   * Evaluates the expression and returns the resulting value.
   * @param qc query context
   * @return result
   * @throws QueryException query exception
   */
  public Value value(final QueryContext qc) throws QueryException {
    if(value == null) {
      final int fp = vs.enter(qc);
      try {
        final Value val = expr.value(qc);
        value = declType != null ? declType.coerce(val, qc, info, name, null) : val;