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<?php namespace EasyRdf\Sparql; /** * EasyRdf * * LICENSE * * Copyright (c) 2009-2020 Nicholas J Humfrey. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * @package EasyRdf * @copyright Copyright (c) 2009-2020 Nicholas J Humfrey * @license https://www.opensource.org/licenses/bsd-license.php */ use EasyRdf\Exception; use EasyRdf\Literal; use EasyRdf\Resource; /** * Class for returned for SPARQL SELECT and ASK query responses. * * @package EasyRdf * @copyright Copyright (c) 2009-2020 Nicholas J Humfrey * @license https://www.opensource.org/licenses/bsd-license.php */ class Result extends \ArrayIterator { /** The SPARQL Results type (either 'boolean' or 'bindings') */ private $type = null; /** The value of a boolean result */ private $boolean = null; /** Keep track of the XML parser state */ private $fields = array(); /** Keep track of the XML parser state */ private $parseState = array(); /** A constant for the SPARQL Query Results XML Format namespace */ const SPARQL_XML_RESULTS_NS = 'http://www.w3.org/2005/sparql-results#'; /** Create a new SPARQL Result object * * You should not normally need to create a SPARQL result * object directly - it will be constructed automatically * for you by EasyRdf\Sparql\_Client. * * @param string $data The SPARQL result body * @param string $mimeType The MIME type of the result * * @throws \EasyRdf\Exception */ public function __construct($data, $mimeType) { if ($mimeType == 'application/sparql-results+xml') { $this->parseXml($data); } elseif ($mimeType == 'application/sparql-results+json') { $this->parseJson($data); } else { throw new Exception( "Unsupported SPARQL Query Results format: $mimeType" ); } } /** Get the query result type (boolean/bindings) * * ASK queries return a result of type 'boolean'. * SELECT query return a result of type 'bindings'. * * @return string The query result type. */ public function getType() { return $this->type; } /** Return the boolean value of the query result * * If the query was of type boolean then this method will * return either true or false. If the query was of some other * type then this method will return null. * * @return boolean The result of the query. */ public function getBoolean() { return $this->boolean; } /** Return true if the result of the query was true. * * @return boolean True if the query result was true. */ public function isTrue() { return $this->boolean == true; } /** Return false if the result of the query was false. * * @return boolean True if the query result was false. */ public function isFalse() { return $this->boolean == false; } /** Return the number of fields in a query result of type bindings. * * @return integer The number of fields. */ public function numFields() { return count($this->fields); } /** Return the number of rows in a query result of type bindings. * * @return integer The number of rows. */ public function numRows() { return count($this); } /** Get the field names in a query result of type bindings. * * @return array The names of the fields in the result. */ public function getFields() { return $this->fields; } /** Return a human readable view of the query result. * * This method is intended to be a debugging aid and will * return a pretty-print view of the query result. * * @param string $format Either 'text' or 'html' * * @throws Exception * @return string */ public function dump($format = 'html') { if ($this->type == 'bindings') { $result = ''; if ($format == 'html') { $result .= "<table class='sparql-results' style='border-collapse:collapse'>"; $result .= "<tr>"; foreach ($this->fields as $field) { $result .= "<th style='border:solid 1px #000;padding:4px;". "vertical-align:top;background-color:#eee;'>". "?$field</th>"; } $result .= "</tr>"; foreach ($this as $row) { $result .= "<tr>"; foreach ($this->fields as $field) { if (isset($row->$field)) { $result .= "<td style='border:solid 1px #000;padding:4px;". "vertical-align:top'>". $row->$field->dumpValue($format)."</td>"; } else { $result .= "<td> </td>"; } } $result .= "</tr>"; } $result .= "</table>"; } else { // First calculate the width of each comment $colWidths = array(); foreach ($this->fields as $field) { $colWidths[$field] = strlen($field); } $textData = array(); foreach ($this as $row) { $textRow = array(); foreach ($row as $k => $v) { $textRow[$k] = $v->dumpValue('text'); $width = strlen($textRow[$k]); if ($colWidths[$k] < $width) { $colWidths[$k] = $width; } } $textData[] = $textRow; } // Create a horizontal rule $hr = "+"; foreach ($colWidths as $v) { $hr .= "-".str_repeat('-', $v).'-+'; } // Output the field names $result .= "$hr\n|"; foreach ($this->fields as $field) { $result .= ' '.str_pad("?$field", $colWidths[$field]).' |'; } // Output each of the rows $result .= "\n$hr\n"; foreach ($textData as $textRow) { $result .= '|'; foreach ($textRow as $k => $v) { $result .= ' '.str_pad($v, $colWidths[$k]).' |'; } $result .= "\n"; } $result .= "$hr\n"; } return $result; } elseif ($this->type == 'boolean') { $str = ($this->boolean ? 'true' : 'false'); if ($format == 'html') { return "<p>Result: <span style='font-weight:bold'>$str</span></p>"; } else { return "Result: $str"; } } else { throw new Exception( "Failed to dump SPARQL Query Results format, unknown type: ".$this->type ); } } /** Create a new EasyRdf\Resource or EasyRdf\Literal depending * on the type of data passed in. * * @ignore */ protected function newTerm($data) { switch ($data['type']) { case 'bnode': return new Resource('_:'.$data['value']); case 'uri': return new Resource($data['value']); case 'literal': case 'typed-literal': return Literal::create($data); default: throw new Exception( "Failed to parse SPARQL Query Results format, unknown term type: ". $data['type'] ); } } /** XML Result Parser: this function is called when an XML element starts * * @ignore */ public function startElementHandler($parser) { if ($parser->depth() == 1) { if ($parser->name != 'sparql') { throw new Exception( "Root node in XML Query Results format is not <sparql>" ); } elseif ($parser->namespaceURI != self::SPARQL_XML_RESULTS_NS) { throw new Exception( "Root node namespace is not ".self::SPARQL_XML_RESULTS_NS ); } } else { switch ($parser->path()) { case 'sparql/boolean': $this->type = 'boolean'; break; case 'sparql/head/variable': $this->fields[] = $parser->getAttribute('name'); break; case 'sparql/results': $this->type = 'bindings'; break; case 'sparql/results/result': $this->parseState['result'] = new \stdClass(); break; case 'sparql/results/result/binding': $this->parseState['key'] = $parser->getAttribute('name'); $this->parseState['bindingType'] = null; $this->parseState['text'] = null; $this->parseState['lang'] = null; $this->parseState['datatype'] = null; break; case 'sparql/results/result/binding/bnode': $this->parseState['bindingType'] = 'bnode'; break; case 'sparql/results/result/binding/literal': $this->parseState['bindingType'] = 'literal'; $this->parseState['lang'] = $parser->getAttribute('xml:lang'); $this->parseState['datatype'] = $parser->getAttribute('datatype'); break; case 'sparql/results/result/binding/uri': $this->parseState['bindingType'] = 'uri'; break; } } } /** XML Result Parser: this function is called when text is encountered * * @ignore */ public function textHandler($parser) { $this->parseState['text'] = $parser->value; } /** XML Result Parser: this function is called when an XML element ends * * @ignore */ public function endElementHandler($parser) { switch ($parser->path()) { case 'sparql/boolean': $this->boolean = ($this->parseState['text'] == 'true') ? true : false; break; case 'sparql/results/result/binding': $key = $this->parseState['key']; $this->parseState['result']->$key = $this->newTerm([ 'type' => $this->parseState['bindingType'], 'value' => $this->parseState['text'], 'lang' => $this->parseState['lang'], 'datatype' => $this->parseState['datatype'] ]); break; case 'sparql/results/result': $this[] = $this->parseState['result']; break; } } /** Parse a SPARQL result in the XML format into the object. * * @ignore */ protected function parseXml($data) { $this->parseState = array(); $this->type = null; $parser = new \EasyRdf\XMLParser(); $parser->startElementCallback = [$this, 'startElementHandler']; $parser->textCallback = [$this, 'textHandler']; $parser->endElementCallback = [$this, 'endElementHandler']; $parser->parse($data); if (!$this->type) { throw new Exception( "Failed to parse SPARQL XML Query Results format: unknown type" ); } } /** Parse a SPARQL result in the JSON format into the object. * * @ignore */ protected function parseJson($data) { // Decode JSON to an array $data = json_decode($data, true); if (isset($data['boolean'])) { $this->type = 'boolean'; $this->boolean = $data['boolean']; } elseif (isset($data['results'])) { $this->type = 'bindings'; if (isset($data['head']['vars'])) { $this->fields = $data['head']['vars']; } foreach ($data['results']['bindings'] as $row) { $t = new \stdClass(); foreach ($row as $key => $value) { $t->$key = $this->newTerm($value); } $this[] = $t; } } else { throw new Exception( "Failed to parse SPARQL JSON Query Results format" ); } } /** Magic method to return value of the result to string * * If this is a boolean result then it will return 'true' or 'false'. * If it is a bindings type, then it will dump as a text based table. * * @return string A string representation of the result. */ public function __toString() { if ($this->type == 'boolean') { return $this->boolean ? 'true' : 'false'; } else { return $this->dump('text'); } } }
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