[TASK] Allow toggling whether to shorten uris using prefixs.

src/main/java/lu/jpt/csparqlproject/util/PrefixManager.java

@@ -0,0 +1,45 @@
+package lu.jpt.csparqlproject.util;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * This is a small helper class which will be used on some occasions
+ * to make output easier to read by providing a method to replace known
+ * uris in (tuple) strings with their known prefix.
+ */
+public class PrefixManager {
+
+	/**
+	 * Key is the uri, value is its prefix
+	 */
+	private Map<String, String> prefixTable;
+	
+	
+	public PrefixManager() {
+		this.prefixTable = new HashMap<String, String>();
+	}
+	
+	/**
+	 * Register a known prefix with its corresponding uri
+	 * @param prefix
+	 * @param uri
+	 */
+	public void registerPrefix(String prefix, String uri) {
+		this.prefixTable.put(uri, prefix);
+	}
+	
+	/**
+	 * Replace all uris within a tuple with their know prefix
+	 * This is not efficient, but that is not the point
+	 * @param tuple as a string
+	 * @return shortened tuple string
+	 */
+	public String applyPrefix(String tuple) {
+		for (Map.Entry<String, String> entry : this.prefixTable.entrySet()) {
+			tuple = tuple.replace(entry.getKey(), entry.getValue() + ":");
+		}
+		return tuple;
+	}
+	
+}