ARC_rdf_store_construct_handler.php in Taxonomy import/export via XML 5.2

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arc/ARC_rdf_store_construct_handler.php

<?php

/*
appmosphere RDF classes (ARC): http://www.appmosphere.com/en-arc

Copyright (c) 2006 appmosphere web applications, Germany. All Rights Reserved.
This work is distributed under the W3C(r) Software License [1] in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231

ns sk                       http://www.appmosphere.com/ns/site_kit#
ns doap                     http://usefulinc.com/ns/doap#
sk:className                ARC_rdf_store_construct_handler
doap:name                   ARC RDF Store CONSTRUCT query handler
doap:license                http://www.appmosphere.com/en-arc_license
doap:programming-language   PHP
doap:maintainer             Benjamin Nowack
doap:shortdesc              This class handles SPARQL CONSTRUCT queries 
//release
doap:created                2006-04-19
doap:revision               0.1.0
//changelog
sk:releaseChanges           2006-04-19: release 0.1.0
*/
class ARC_rdf_store_construct_handler {
  var $version = "0.1.0";
  function __construct(&$api) {
    $this->api =& $api;
    $this->config = $this->api
      ->get_config();
    $this->ns_prefixes = array();
    $this->ns_prefix_count = 0;
  }
  function ARC_rdf_store_construct_handler(&$api) {
    $this
      ->__construct($api);
  }

  /*					*/
  function get_qname($iri = "") {
    if (preg_match("/(.*[\\/|#|\\:])([^\\/|#|\\:]+)/", $iri, $matches)) {
      $ns_iri = $matches[1];
      $local_name = $matches[2];
      if ($ns_iri == "http://www.w3.org/1999/02/22-rdf-syntax-ns#") {
        return "rdf:" . $local_name;
      }
      if (!array_key_exists($ns_iri, $this->ns_prefixes)) {
        $this->ns_prefixes[$ns_iri] = "ns" . $this->ns_prefix_count;
        $this->ns_prefix_count++;
      }
      return $this->ns_prefixes[$ns_iri] . ":" . $local_name;
    }
    return false;
  }

  /*					*/
  function decode_mysql_utf8_bugs($val = "") {
    return $this->api
      ->decode_mysql_utf8_bugs($val);
  }

  /*					*/
  function get_result($args = "") {

    /* infos, result_type (rdfxml|n3|turtle|sql), result_type_args() */
    if (!isset($args["infos"])) {
      return array(
        "result" => "",
        "error" => "missing parameter 'infos'",
      );
    }
    $args["result_type"] = isset($args["result_type"]) ? $args["result_type"] : "rdfxml";
    $result_type = $args["result_type"];

    /* rewrite to sql */
    if (!($rewriter = $this->api
      ->get_sparql2sql_rewriter())) {
      return $this->api
        ->get_default_error();
    }
    $sql = $rewriter
      ->get_sql($args);
    if (is_array($sql) && ($error = $sql["error"])) {
      return $sql;
    }
    if ($result_type == "sql") {
      return array(
        "result" => $sql,
        "error" => "",
      );
    }

    /* run query */
    $t1 = $this->api
      ->get_mtime();
    if ($this->config["store_type"] != "basic") {
      $this->api
        ->create_merge_tables();
    }
    if (!($rs = mysql_query($sql))) {
      return array(
        "result" => "",
        "error" => mysql_error(),
      );
    }
    $t2 = $this->api
      ->get_mtime();
    $dur = $t2 - $t1;

    /* result */
    $mthd = "get_" . $result_type . "_result";
    if (method_exists($this, $mthd)) {
      $args["rs"] =& $rs;
      $sub_result = $this
        ->{$mthd}($args);
      @mysql_free_result($rs);
      return array(
        "result" => $sub_result["result"],
        "error" => $sub_result["error"],
        "headers" => isset($sub_result["headers"]) ? $sub_result["headers"] : array(),
        "query_time" => $dur,
      );
    }
    @mysql_free_result($rs);

    /* unsupported result type */
    return array(
      "result" => false,
      "error" => "Unsupported result type '" . rawurlencode($result_type) . "'",
      "headers" => array(),
      "query_time" => $dur,
    );
  }

  /*					*/
  function get_rdfxml_result($args = "") {
    $ind = " ";
    $nl = "\n";
    $code = "";
    if (!isset($args["infos"]["template_triples"]["triples"])) {
      return array(
        "result" => "",
        "error" => "Could not construct graph.",
      );
    }
    $tts = $args["infos"]["template_triples"]["triples"];
    $rs =& $args["rs"];
    $enc_vals = $this->config["encode_values"];
    $conv_id = in_array($this->config["id_type"], array(
      "hash_int",
      "incr_int",
    ));
    $fix_utf8 = isset($args["fix_utf8"]) ? $args["fix_utf8"] : false;
    $row_count = 0;
    while ($rs_row = mysql_fetch_array($rs)) {
      $row_count++;
      $row = array();
      foreach ($rs_row as $col => $val) {
        if (!is_numeric($col)) {
          if (strpos($col, "__dt") !== false) {
            $row[$col] = $conv_id ? $this->api
              ->get_val("CONV('" . $val . "', 16, 10)") : $this->api
              ->get_val("'" . $val . "'");
          }
          elseif (isset($rs_row[$col . "__type"]) && $rs_row[$col . "__type"] > 1) {

            /* literal */
            $val = $enc_vals ? rawurldecode($val) : $val;
            $val = $this
              ->decode_mysql_utf8_bugs($val);
            $row[$col] = $fix_utf8 ? $this->api
              ->adjust_utf8_string($val) : $val;
          }
          else {
            $row[$col] = $enc_vals ? rawurldecode($val) : $val;
          }
          $cols[] = $col;
        }
      }
      $prev_s_type = "";
      $prev_s_val = "";
      foreach ($tts as $tt) {

        /* s */
        $s = $tt["s"];
        $s_type = $s["type"];
        if ($s_type == "var") {
          $s_val = $row[$s["val"]];
          $s_val_type = $row[$s["val"] . "__type"];
        }
        elseif ($s_type == "bnode") {
          $s_val = $s["val"] . "_" . $row_count;
          $s_val_type = "bnode";
        }
        else {
          $s_val = $s["val"];
          $s_val_type = $s_type;
        }
        if ($s_type != $prev_s_type || $s_val != $prev_s_val) {

          /* new s */
          $code .= $prev_s_type ? $nl . $ind . '</rdf:Description>' : "";
          $prev_s_type = $s_type;
          $prev_s_val = $s_val;
          $code .= strlen($code) ? $nl . $nl . $ind . '<rdf:Description' : $ind . '<rdf:Description';
          $code .= $s_type == "iri" || $s_val_type == 0 ? ' rdf:about="' . $s_val . '"' : ' rdf:nodeID="' . substr($s_val, 2) . '"';
          $code .= '>';
        }

        /* p, o */
        $p = $tt["p"];
        $p_type = $p["type"];
        $p_val = $p_type == "var" ? $row[$p["val"]] : $p["val"];
        $o = $tt["o"];
        $o_type = $o["type"];
        if ($o_type == "var") {
          $o_val = $row[$o["val"]];
          $o_val_lang = isset($row[$o["val"] . "__lang"]) ? $row[$o["val"] . "__lang"] : "";
          $o_val_dt = !$o_val_lang && isset($row[$o["val"] . "__dt"]) ? $row[$o["val"] . "__dt"] : "";
          $o_val_type = $row[$o["val"] . "__type"];
        }
        elseif ($o_type == "bnode") {
          $o_val = $o["val"] . "_" . $row_count;
          $o_val_type = "bnode";
        }
        else {
          $o_val = $o["val"];
          $o_val_lang = isset($o["lang"]) ? $o["lang"] : "";
          $o_val_dt = !$o_val_lang && isset($o["dt"]) ? $o["dt"] : "";
          $o_val_type = $o_type;
        }
        $p_qname = $this
          ->get_qname($p_val);
        $code .= $nl . $ind . $ind . '<' . $p_qname;
        if (in_array($o_val_type, array(
          "iri",
          "0",
        ))) {
          $code .= ' rdf:resource="' . $o_val . '"/>';
        }
        elseif (in_array($o_val_type, array(
          "bnode",
          1,
        ))) {
          $code .= ' rdf:nodeID="' . substr($o_val, 2) . '"/>';
        }
        else {

          /* literal */
          if ($o_val_lang) {
            $code .= ' xml:lang="' . rawurlencode($o_val_lang) . '"';
          }
          elseif ($o_val_dt && $o_val_dt != "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral") {
            $code .= ' rdf:datatype="' . htmlspecialchars($o_val_dt) . '"';
          }
          if (strpos(trim($o_val), "<") === 0 || $o_val_dt == "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral") {
            $code .= ' rdf:parseType="Literal">' . $o_val;
          }
          elseif (htmlspecialchars(str_replace('"', "", $o_val)) != str_replace('"', "", $o_val)) {

            /* <, >, & */
            $code .= '><![CDATA[' . $o_val . ']]>';
          }
          else {
            $code .= '>' . $o_val;
          }
          $code .= '</' . $p_qname . '>';
        }
      }
      $code .= $nl . $ind . '</rdf:Description>';
    }

    /* rdf doc */
    $result = '' . '<?xml version="1.0" encoding="UTF-8"?>' . $nl . '<rdf:RDF' . $nl . $ind . 'xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"';
    '';
    foreach ($this->ns_prefixes as $iri => $prefix) {
      $result .= $nl . $ind . 'xmlns:' . $prefix . '="' . $iri . '"';
    }
    $result .= '>' . $nl . $nl . $code . $nl . '</rdf:RDF>' . $nl;
    return array(
      "result" => $result,
      "error" => "",
    );
  }
  function get_turtle_result($args = "") {
    $ind = " ";
    $nl = "\n";
    $code = "";
    if (!isset($args["infos"]["template_triples"]["triples"])) {
      return array(
        "result" => "",
        "error" => "Could not construct graph.",
      );
    }
    $tts = $args["infos"]["template_triples"]["triples"];
    $rs =& $args["rs"];
    $enc_vals = $this->config["encode_values"];
    $conv_id = in_array($this->config["id_type"], array(
      "hash_int",
      "incr_int",
    ));
    $fix_utf8 = isset($args["fix_utf8"]) ? $args["fix_utf8"] : false;
    $row_count = 0;
    while ($rs_row = mysql_fetch_array($rs)) {
      $row_count++;
      $row = array();
      foreach ($rs_row as $col => $val) {
        if (!is_numeric($col)) {
          if (strpos($col, "__dt") !== false) {
            $row[$col] = $conv_id ? $this->api
              ->get_val("CONV('" . $val . "', 16, 10)") : $this->api
              ->get_val("'" . $val . "'");
          }
          elseif (isset($rs_row[$col . "__type"]) && $rs_row[$col . "__type"] > 1) {

            /* literal */
            $val = $enc_vals ? rawurldecode($val) : $val;
            $val = $this
              ->decode_mysql_utf8_bugs($val);
            $row[$col] = $fix_utf8 ? $this->api
              ->adjust_utf8_string($val) : $val;
          }
          else {
            $row[$col] = $enc_vals ? rawurldecode($val) : $val;
          }
          $cols[] = $col;
        }
      }
      foreach ($tts as $tt) {
        $cur_code = strlen($code) ? $nl : "";
        foreach (array(
          "s",
          "p",
          "o",
        ) as $cur_part) {
          $cur_term = $tt[$cur_part];
          $cur_type = $cur_term["type"];
          if ($cur_type == "iri") {
            $cur_code .= '<' . $cur_term["val"] . '>';
          }
          elseif ($cur_type == "var") {
            $cur_val = $row[$cur_term["val"]];
            $cur_val_type = isset($row[$cur_term["val"] . "__type"]) ? $row[$cur_term["val"] . "__type"] : "iri";
            if (in_array($cur_val_type, array(
              "iri",
              "0",
            ))) {
              $cur_code .= '<' . $cur_val . '>';
            }
            elseif ($cur_val_type == 1) {

              /* bnode */
              $cur_code .= $cur_val;
            }
            else {

              /* literal */
              $cur_code .= '"' . $this->api
                ->escape_js_string($cur_val) . '"';
              if (isset($row[$cur_term["val"] . "__lang"]) && ($cur_lang = $row[$cur_term["val"] . "__lang"])) {
                $cur_code .= '@' . rawurlencode($cur_lang);
              }
              elseif (isset($row[$cur_term["val"] . "__dt"]) && ($cur_dt = $row[$cur_term["val"] . "__dt"])) {
                $cur_code .= '^^<' . $cur_dt . '>';
              }
            }
          }
          elseif ($cur_type == "bnode") {
            $cur_code .= $cur_term["val"] . "_" . $row_count;
          }
          elseif (in_array($cur_type, array(
            "literal",
            "numeric",
          ))) {
            $cur_code .= $cur_term["delim_code"] . $cur_term["val"] . $cur_term["delim_code"];
          }
          else {
            $cur_code .= '"unknown template part (' . $cur_type . ')"';
          }
          $cur_code .= $cur_part == "o" ? " ." : " ";
        }
        $code .= $cur_code;
      }
      $code .= $nl;
    }
    return array(
      "result" => $code,
      "error" => "",
    );
  }
  function get_n3_result($args = "") {
    return $this
      ->get_turtle_result($args);
  }

}

Classes

Name	Description
ARC_rdf_store_construct_handler