first commit

lib/pkp/plugins/oaiMetadataFormats/dc/PKPOAIMetadataFormat_DC.php

@@ -0,0 +1,96 @@
+<?php
+
+/**
+ * @file plugins/oaiMetadataFormats/dc/PKPOAIMetadataFormat_DC.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2003-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class PKPOAIMetadataFormat_DC
+ *
+ * @see OAI
+ *
+ * @brief OAI metadata format class -- Dublin Core.
+ */
+
+namespace PKP\plugins\oaiMetadataFormats\dc;
+
+use PKP\core\DataObject;
+use PKP\core\PKPString;
+use PKP\metadata\MetadataDescription;
+use PKP\metadata\MetadataProperty;
+use PKP\oai\OAIUtils;
+
+class PKPOAIMetadataFormat_DC extends \PKP\oai\OAIMetadataFormat
+{
+    /**
+     * @copydoc OAIMetadataFormat::toXML
+     *
+     * @param DataObject $dataObject
+     * @param null|mixed $format
+     */
+    public function toXml($dataObject, $format = null)
+    {
+        $dcDescription = $dataObject->extractMetadata(new \APP\plugins\metadata\dc11\schema\Dc11Schema());
+
+        $response = "<oai_dc:dc\n" .
+            "\txmlns:oai_dc=\"http://www.openarchives.org/OAI/2.0/oai_dc/\"\n" .
+            "\txmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n" .
+            "\txmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n" .
+            "\txsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/oai_dc/\n" .
+            "\thttp://www.openarchives.org/OAI/2.0/oai_dc.xsd\">\n";
+
+        foreach ($dcDescription->getProperties() as $propertyName => $property) { /** @var MetadataProperty $property */
+            if ($dcDescription->hasStatement($propertyName)) {
+                if ($property->getTranslated()) {
+                    $values = $dcDescription->getStatementTranslations($propertyName);
+                } else {
+                    $values = $dcDescription->getStatement($propertyName);
+                }
+                $response .= $this->formatElement($propertyName, $values, $property->getTranslated());
+            }
+        }
+
+        $response .= "</oai_dc:dc>\n";
+
+        return $response;
+    }
+
+    /**
+     * Format XML for single DC element.
+     *
+     * @param string $propertyName
+     * @param bool $multilingual optional
+     */
+    public function formatElement($propertyName, $values, $multilingual = false)
+    {
+        if (!is_array($values)) {
+            $values = [$values];
+        }
+
+        // Translate the property name to XML syntax.
+        $openingElement = str_replace(['[@', ']'], [' ',''], $propertyName);
+        $closingElement = PKPString::regexp_replace('/\[@.*/', '', $propertyName);
+
+        // Create the actual XML entry.
+        $response = '';
+        foreach ($values as $key => $value) {
+            if ($multilingual) {
+                $key = str_replace('_', '-', $key);
+                assert(is_array($value));
+                foreach ($value as $subValue) {
+                    if ($key == MetadataDescription::METADATA_DESCRIPTION_UNKNOWN_LOCALE) {
+                        $response .= "\t<{$openingElement}>" . OAIUtils::prepOutput($subValue) . "</{$closingElement}>\n";
+                    } else {
+                        $response .= "\t<{$openingElement} xml:lang=\"{$key}\">" . OAIUtils::prepOutput($subValue) . "</{$closingElement}>\n";
+                    }
+                }
+            } else {
+                assert(is_scalar($value));
+                $response .= "\t<{$openingElement}>" . OAIUtils::prepOutput($value) . "</{$closingElement}>\n";
+            }
+        }
+        return $response;
+    }
+}