src/dse_line_string.cpp

/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

#include "dse_line_string.hpp"
#include "dse_validate.hpp"

#include "string_ref.hpp"

#include <assert.h>
#include <iomanip>
#include <sstream>

using namespace datastax;
using namespace datastax::internal::core;
using namespace datastax::internal::enterprise;

extern "C" {

DseLineString* dse_line_string_new() { return DseLineString::to(new LineString()); }

void dse_line_string_free(DseLineString* line_string) { delete line_string->from(); }

void dse_line_string_reset(DseLineString* line_string) { line_string->reset(); }

void dse_line_string_reserve(DseLineString* line_string, cass_uint32_t num_points) {
  line_string->reserve(num_points);
}

CassError dse_line_string_add_point(DseLineString* line_string, cass_double_t x, cass_double_t y) {
  line_string->add_point(x, y);
  return CASS_OK;
}

CassError dse_line_string_finish(DseLineString* line_string) { return line_string->finish(); }

DseLineStringIterator* dse_line_string_iterator_new() {
  return DseLineStringIterator::to(new LineStringIterator());
}

void dse_line_string_iterator_free(DseLineStringIterator* iterator) { delete iterator->from(); }

CassError dse_line_string_iterator_reset(DseLineStringIterator* iterator, const CassValue* value) {
  return iterator->reset_binary(value);
}

CassError dse_line_string_iterator_reset_with_wkt_n(DseLineStringIterator* iterator,
                                                    const char* wkt, size_t wkt_length) {
  return iterator->reset_text(wkt, wkt_length);
}

CassError dse_line_string_iterator_reset_with_wkt(DseLineStringIterator* iterator,
                                                  const char* wkt) {
  return dse_line_string_iterator_reset_with_wkt_n(iterator, wkt, SAFE_STRLEN(wkt));
}

cass_uint32_t dse_line_string_iterator_num_points(const DseLineStringIterator* iterator) {
  return iterator->num_points();
}

CassError dse_line_string_iterator_next_point(DseLineStringIterator* iterator, cass_double_t* x,
                                              cass_double_t* y) {
  return iterator->next_point(x, y);
}

} // extern "C"

String LineString::to_wkt() const {
  // Special case empty line string
  if (num_points_ == 0) {
    return "LINESTRING EMPTY";
  }

  OStringStream ss;
  ss.precision(WKT_MAX_DIGITS);
  ss << "LINESTRING (";
  const cass_byte_t* pos = bytes_.data() + WKB_HEADER_SIZE + sizeof(cass_uint32_t);
  for (cass_uint32_t i = 0; i < num_points_; ++i) {
    if (i > 0) ss << ", ";
    ss << decode_double(pos, native_byte_order());
    pos += sizeof(cass_double_t);
    ss << " ";
    ss << decode_double(pos, native_byte_order());
    pos += sizeof(cass_double_t);
  }
  ss << ")";
  return ss.str();
}

CassError LineStringIterator::reset_binary(const CassValue* value) {
  size_t size = 0;
  const cass_byte_t* pos = NULL;
  WkbByteOrder byte_order;
  cass_uint32_t num_points = 0;
  CassError rc = CASS_OK;

  rc = validate_data_type(value, DSE_LINE_STRING_TYPE);
  if (rc != CASS_OK) return rc;

  rc = cass_value_get_bytes(value, &pos, &size);
  if (rc != CASS_OK) return rc;

  if (size < WKB_LINE_STRING_HEADER_SIZE) {
    return CASS_ERROR_LIB_NOT_ENOUGH_DATA;
  }
  size -= WKB_LINE_STRING_HEADER_SIZE;

  if (decode_header(pos, &byte_order) != WKB_GEOMETRY_TYPE_LINESTRING) {
    return CASS_ERROR_LIB_INVALID_DATA;
  }
  pos += WKB_HEADER_SIZE;

  num_points = decode_uint32(pos, byte_order);
  pos += sizeof(cass_uint32_t);

  if (size < 2 * num_points * sizeof(cass_double_t)) {
    return CASS_ERROR_LIB_NOT_ENOUGH_DATA;
  }

  num_points_ = num_points;
  binary_iterator_ = BinaryIterator(pos, pos + size, byte_order);
  iterator_ = &binary_iterator_;

  return CASS_OK;
}

bool isnum(int c) { return isdigit(c) || c == '+' || c == '-' || c == '.'; }

CassError LineStringIterator::reset_text(const char* text, size_t size) {
  cass_uint32_t num_points = 0;
  const bool skip_numbers = true;
  WktLexer lexer(text, size, skip_numbers);

  if (lexer.next_token() != WktLexer::TK_TYPE_LINESTRING) {
    return CASS_ERROR_LIB_BAD_PARAMS;
  }

  // Validate format and count the number of points
  WktLexer::Token token = lexer.next_token();

  // Special case "LINESTRING EMPTY"
  if (token == WktLexer::TK_EMPTY) {
    return CASS_OK;
  }

  if (token != WktLexer::TK_OPEN_PAREN) {
    return CASS_ERROR_LIB_BAD_PARAMS;
  }

  token = lexer.next_token();
  while (token != WktLexer::TK_EOF && token != WktLexer::TK_CLOSE_PAREN) {
    // First number in point
    if (token != WktLexer::TK_NUMBER) {
      return CASS_ERROR_LIB_BAD_PARAMS;
    }

    // Second number in point
    token = lexer.next_token();
    if (token != WktLexer::TK_NUMBER) {
      return CASS_ERROR_LIB_BAD_PARAMS;
    }

    ++num_points;

    // Check and skip "," token
    token = lexer.next_token();
    if (token == WktLexer::TK_COMMA) {
      token = lexer.next_token();
      // Verify there are more points
      if (token != WktLexer::TK_NUMBER) {
        return CASS_ERROR_LIB_BAD_PARAMS;
      }
    }
  }

  // Validate closing ")"
  if (token != WktLexer::TK_CLOSE_PAREN) {
    return CASS_ERROR_LIB_BAD_PARAMS;
  }

  num_points_ = num_points;
  text_iterator_ = TextIterator(text, size);
  iterator_ = &text_iterator_;

  return CASS_OK;
}

CassError LineStringIterator::BinaryIterator::next_point(cass_double_t* x, cass_double_t* y) {
  if (position_ >= points_end_) {
    return CASS_ERROR_LIB_INVALID_STATE;
  }

  *x = decode_double(position_, byte_order_);
  position_ += sizeof(cass_double_t);
  *y = decode_double(position_, byte_order_);
  position_ += sizeof(cass_double_t);

  return CASS_OK;
}

LineStringIterator::TextIterator::TextIterator(const char* text, size_t size)
    : lexer_(text, size) {
  WktLexer::Token token;
  UNUSED_(token);
  // Skip over "LINESTRING (" tokens
  token = lexer_.next_token();
  assert(token == WktLexer::TK_TYPE_LINESTRING);
  token = lexer_.next_token();
  assert(token == WktLexer::TK_OPEN_PAREN);
}

CassError LineStringIterator::TextIterator::next_point(cass_double_t* x, cass_double_t* y) {
  WktLexer::Token token;

  // If we're at the end of the text this will return WktLexer::TK_EOF
  token = lexer_.next_token();
  if (token != WktLexer::TK_NUMBER) {
    return CASS_ERROR_LIB_INVALID_STATE;
  }
  *x = lexer_.number();

  token = lexer_.next_token();
  assert(token == WktLexer::TK_NUMBER);
  *y = lexer_.number();

  // Skip trailing "," or  ")" tokens
  token = lexer_.next_token();
  assert(token == WktLexer::TK_COMMA || token == WktLexer::TK_CLOSE_PAREN);

  return CASS_OK;
}