示例#1
0
  @Override
  public Value value(final QueryContext ctx) throws QueryException {
    final int o = (int) ctx.resources.output.size();
    final Updates updates = ctx.resources.updates();
    final ContextModifier tmp = updates.mod;
    final TransformModifier pu = new TransformModifier();
    updates.mod = pu;

    try {
      for (final Let fo : copies) {
        final Iter ir = ctx.iter(fo.expr);
        Item i = ir.next();
        if (!(i instanceof ANode) || ir.next() != null) throw UPCOPYMULT.get(fo.info, fo.var.name);

        // copy node to main memory data instance
        i = ((ANode) i).dbCopy(ctx.context.options);
        // add resulting node to variable
        ctx.set(fo.var, i, info);
        pu.addData(i.data());
      }
      final Value v = ctx.value(expr[0]);
      if (!v.isEmpty()) throw BASEX_MOD.get(info);

      updates.prepare();
      updates.apply();
      return ctx.value(expr[1]);
    } finally {
      ctx.resources.output.size(o);
      updates.mod = tmp;
    }
  }
示例#2
0
  @Override
  public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
    final Data data = checkData(qc);
    final String path = path(1, qc);
    final Item item = toItem(exprs[2], qc);
    final Options opts = toOptions(3, Q_OPTIONS, new Options(), qc);

    final Updates updates = qc.resources.updates();
    final IntList docs = data.resources.docs(path);
    int d = 0;

    // delete binary resources
    final IOFile bin = data.meta.binary(path);
    if (bin == null || bin.isDir()) throw BXDB_REPLACE_X.get(info, path);

    if (item instanceof Bin) {
      updates.add(new DBStore(data, path, item, info), qc);
    } else {
      if (bin.exists()) updates.add(new DBDelete(data, path, info), qc);
      final NewInput input = checkInput(item, token(path));
      if (docs.isEmpty() || docs.get(0) == 0) {
        // no replacement of first document (because of TableDiskAccess#insert, used > 0, pre = 0)
        updates.add(new DBAdd(data, input, opts, qc, info), qc);
      } else {
        updates.add(new ReplaceDoc(docs.get(0), data, input, opts, qc, info), qc);
        d = 1;
      }
    }

    // delete old documents
    final int ds = docs.size();
    for (; d < ds; d++) updates.add(new DeleteNode(docs.get(d), data, info), qc);
    return null;
  }