Merge pull request #4 from europeana/develop

## Add Rdf Format and common module

pom.xml

@@ -6,6 +6,7 @@
         <module>record-api-impl</module>
         <module>record-api-mongo</module>
         <module>record-api-web</module>
+        <module>record-api-common</module>
     </modules>
 
     <parent>

record-api-common/pom.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>record-api</artifactId>
+        <groupId>eu.europeana.api</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>record-api-common</artifactId>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
+
+</project>

record-api-common/src/main/java/eu.europeana.api.format/RdfFormat.java

@@ -0,0 +1,63 @@
+package eu.europeana.api.format;
+
+public enum RdfFormat {
+    JSONLD("jsonld", "json", "application/ld+json", "application/json"),
+    XML("rdf", "xml", "application/rdf+xml", "application/xml", "text/xml", "rdf/xml"),
+    TURTLE("ttl", null, "text/turtle", "application/turtle", "application/x-turtle"),
+    N3("n3", null, "text/n3", "text/rdf+n3", "application/n3"),
+    NT("nt", null, "application/n-triples", "application/ntriples", "text/nt");
+
+    private String extension;
+    private String alternative;
+    private String[] mediaTypes;
+
+    RdfFormat(String extension, String alternative, String... mediaTypes) {
+        this.extension = extension;
+        this.alternative = alternative;
+        this.mediaTypes = mediaTypes;
+    }
+
+    public static RdfFormat getFormatByExtension(String extension) {
+        for (RdfFormat format : RdfFormat.values()) {
+            if (format.acceptsExtension(extension)) {
+                return format;
+            }
+        }
+        return null;
+    }
+
+    public static RdfFormat getFormatByMediaType(String mediaType) {
+        for (RdfFormat format : RdfFormat.values()) {
+            if (format.acceptsMediaType(mediaType)) {
+                return format;
+            }
+        }
+        return null;
+    }
+
+    public String getExtension() {
+        return extension;
+    }
+
+    public String getAlternative() {
+        return alternative;
+    }
+
+    public String getMediaType() {
+        return mediaTypes[0];
+    }
+
+    public boolean acceptsExtension(String extension) {
+        return (this.extension.equals(extension)
+                || (this.alternative != null && this.alternative.equals(extension)));
+    }
+
+    public boolean acceptsMediaType(String mediaType) {
+        for (String mType : mediaTypes) {
+            if (mType.equals(mediaType)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}