Пример #1
0
  public IValue buildCollection(Type type, List<Record> records, IEvaluatorContext ctx) {
    IWriter writer;
    while (type.isAliased()) {
      type = type.getAliased();
    }

    if (type.isList()) {
      writer = values.listWriter(type.getElementType());
    } else if (type.isRelation()) {
      writer = values.relationWriter(type.getElementType());
    } else {
      throw RuntimeExceptionFactory.illegalTypeArgument(
          "Invalid result type for CSV reading: " + type, ctx.getCurrentAST(), ctx.getStackTrace());
    }

    // reverse traversal so that the order in case of ListWriter is correct
    // (IWriter only supports inserts at the front).
    Type eltType = type.getElementType();
    for (int i = records.size() - 1; i >= 0; i--) {
      Record record = records.get(i);
      checkRecord(eltType, record, ctx);
      writer.insert(record.getTuple(eltType));
    }
    return writer.done();
  }
Пример #2
0
  public void write(IValue rel, ISourceLocation loc, IEvaluatorContext ctx) {

    OutputStream out = null;

    Type paramType = ctx.getCurrentEnvt().getTypeBindings().get(types.parameterType("T"));
    if (!paramType.isRelation() && !paramType.isListRelation()) {
      throw RuntimeExceptionFactory.illegalTypeArgument(
          "A relation type is required instead of " + paramType,
          ctx.getCurrentAST(),
          ctx.getStackTrace());
    }

    try {
      boolean isListRel = rel instanceof IList;
      out = ctx.getResolverRegistry().getOutputStream(loc.getURI(), false);
      ISet irel = null;
      IList lrel = null;
      if (isListRel) {
        lrel = (IList) rel;
      } else {
        irel = (ISet) rel;
      }

      int nfields = isListRel ? lrel.asRelation().arity() : irel.asRelation().arity();
      if (header) {
        for (int i = 0; i < nfields; i++) {
          if (i > 0) out.write(separator);
          String label = paramType.getFieldName(i);
          if (label == null || label.isEmpty()) label = "field" + i;
          writeString(out, label);
        }
        out.write('\n');
      }
      String separatorAsString = new String(Character.toChars(separator));
      for (IValue v : (isListRel ? lrel : irel)) {
        ITuple tup = (ITuple) v;
        int sep = 0;
        for (IValue w : tup) {
          if (sep == 0) sep = separator;
          else out.write(sep);
          if (w.getType().isString()) {
            String s = ((IString) w).getValue();

            if (s.contains(separatorAsString)
                || s.contains("\n")
                || s.contains("\r")
                || s.contains("\"")) {
              s = s.replaceAll("\"", "\"\"");
              out.write('"');
              writeString(out, s);
              out.write('"');
            } else writeString(out, s);
          } else {
            writeString(out, w.toString());
          }
        }
        out.write('\n');
      }
      out.flush();
      out.close();
    } catch (IOException e) {
      throw RuntimeExceptionFactory.io(values.string(e.getMessage()), null, null);
    } finally {
      if (out != null) {
        try {
          out.flush();
          out.close();
        } catch (IOException ioex) {
          throw RuntimeExceptionFactory.io(values.string(ioex.getMessage()), null, null);
        }
      }
    }
  }