Class Catch

basex-core/src/main/java/org/basex/query/expr/Catch.java:25–199

Catch clause. @author BaseX Team, BSD License @author Christian Gruen

 * @author Christian Gruen
 */
public final class Catch extends Single {
  /** Error tests. */
  private final ArrayList<Test> tests;
  /** Error variables. */
  private final Var[] vars;

  /**
   * Constructor.
   * @param info input info (can be {@code null})
   * @param expr expression
   * @param vars variables to be bound
   * @param tests error tests
   */
  public Catch(final InputInfo info, final Expr expr, final Var[] vars,
      final ArrayList<Test> tests) {
    super(info, expr, Types.ITEM_ZM);
    this.tests = tests;
    this.vars = vars;
    this.expr = expr;
  }

  @Override
  public Catch compile(final CompileContext cc) throws QueryException {
    expr = cc.compileOrError(expr, false);
    return optimize(cc);
  }

  @Override
  public Catch optimize(final CompileContext cc) {
    return (Catch) adoptType(expr);
  }

  /**
   * Returns the value of the caught expression.
   * @param qc query context
   * @param ex caught exception
   * @return resulting item
   * @throws QueryException query exception
   */
  Value value(final QueryContext qc, final QueryException ex) throws QueryException {
    int v = 0;
    for(final Value value : ex.values()) {
      qc.set(vars[v++], value);
    }
    return expr.value(qc);
  }

  @Override
  public Expr copy(final CompileContext cc, final IntObjectMap<Var> vm) {
    final Var[] vrs = QueryException.variables(cc.qc, info);
    final int vl = vrs.length;
    for(int v = 0; v < vl; v++) {
      vm.put(vars[v].id, cc.vs().add(vrs[v]));
    }
    return copyType(new Catch(info, expr.copy(cc, vm), vrs, new ArrayList<>(tests)));
  }

  @Override