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

src/main/java/lu/jpt/csparqlproject/Main.java

@@ -5,6 +5,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import lu.jpt.csparqlproject.gui.SimulationControlWindow;
+import lu.jpt.csparqlproject.util.PrefixManager;
 
 /**
  * This is the main entry point of the whole project. A logger is being set up
@@ -16,6 +17,7 @@ import lu.jpt.csparqlproject.gui.SimulationControlWindow;
 public class Main {
 
 	public static Logger logger = LoggerFactory.getLogger(Main.class);
+	public static PrefixManager prefixManager;
 	
 	public static void main(String[] args) {
 		// Initialize a logger
@@ -24,6 +26,13 @@ public class Main {
 		} catch(Throwable t) {
 			PropertyConfigurator.configure("/log4j.properties");
 		}
+		// Initialize PrefixManager which helps to shorten strings using prefixes
+		Main.prefixManager = new PrefixManager();
+		// Register generic prefixes
+		Main.prefixManager.registerPrefix("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
+		Main.prefixManager.registerPrefix("xsd", "http://www.w3.org/2001/XMLSchema#");
+		Main.prefixManager.registerPrefix("f", "http://larkc.eu/csparql/sparql/jena/ext#");
+		
 		// Initialize SimulationContext and wire it up with its control window
 		final SimulationContext simulationContext = new SimulationContext();
 		// Fire up the control window

src/main/java/lu/jpt/csparqlproject/gui/TextObserverWindow.java

@@ -31,6 +31,7 @@ import eu.larkc.csparql.cep.api.RdfQuadruple;
 import eu.larkc.csparql.common.RDFTable;
 import eu.larkc.csparql.common.RDFTuple;
 import eu.larkc.csparql.core.engine.CsparqlQueryResultProxy;
+import lu.jpt.csparqlproject.Main;
 
 /**
  * Multi-purpose text window to allow for easy viewing of RdfStream quadruples, 
@@ -44,7 +45,7 @@ public class TextObserverWindow extends JFrame implements Observer {
 
 	private JTextPane textPane;
 	private volatile boolean autoScrollToBottom = true;
-
+	private volatile boolean usePrefixManager = true;
 
 	/**
 	 * Constructor
@@ -63,6 +64,15 @@ public class TextObserverWindow extends JFrame implements Observer {
 		this.autoScrollToBottom = autoScrollToBottom;
 	}
 	
+	/**
+	 * Set whether or not the PrefixManager shall be used to shorten
+	 * uris in strings to prefixes.
+	 * @param usePrefixManager
+	 */
+	public void setUsePrefixManager(boolean usePrefixManager) {
+		this.usePrefixManager = usePrefixManager;
+	}
+	
 	/**
 	 * Show the given text in the window
 	 * @param text
@@ -111,7 +121,8 @@ public class TextObserverWindow extends JFrame implements Observer {
 	 * @param color
 	 */
 	public void showQuadruple(RdfQuadruple quad, Color color) {
-		this.appendToTextPane(quad.toString(), true, color);
+		String quadruple = this.shortenUriToPrefix(quad.toString());
+		this.appendToTextPane(quadruple, true, color);
 	}
 	
 	/**
@@ -182,6 +193,20 @@ public class TextObserverWindow extends JFrame implements Observer {
 		});
 		bottomPanel.add(autoscrollCheckbox);
 		
+		// Add a checkbox to toggle uri shortening using PrefixManager
+		JCheckBox usePrefixManagerCheckbox = new JCheckBox();
+		usePrefixManagerCheckbox.setText("Shorten URIs to prefixes");
+		usePrefixManagerCheckbox.setEnabled(true);
+		usePrefixManagerCheckbox.setSelected(true);
+		usePrefixManagerCheckbox.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				JCheckBox checkBox = (JCheckBox) e.getSource();
+				textObserverWindow.setUsePrefixManager(checkBox.isSelected());
+			}
+		});
+		bottomPanel.add(usePrefixManagerCheckbox);
+		
 		// Add buttons to increase/decrease font size
 		JButton increaseFontSizeButton = new JButton("+");
 		increaseFontSizeButton.addActionListener(new ActionListener() {
@@ -296,6 +321,7 @@ public class TextObserverWindow extends JFrame implements Observer {
 			int tokenIndex = 0;
 			while(tokenizer.hasMoreTokens()) {
 				String token = tokenizer.nextToken();
+				token = this.shortenUriToPrefix(token);
 				if(token == "") token = "[NO VALUE]";
 				if(tokenizer.hasMoreTokens()) {
 					token += "\t";
@@ -329,5 +355,19 @@ public class TextObserverWindow extends JFrame implements Observer {
 		return result;
 		
 	}
+	
+	/**
+	 * Helper method to shorten strings using the PrefixManager if 
+	 * this window uses it
+	 * @param str input string
+	 * @return output string, shortened or not depending on usePrefixManager variable
+	 */
+	private String shortenUriToPrefix(String str) {
+		if(this.usePrefixManager) {
+			return Main.prefixManager.applyPrefix(str);
+		} else {
+			return str;
+		}
+	}
 
 }

src/main/java/lu/jpt/csparqlproject/rentacar/RentACarSimulation.java

@@ -8,6 +8,7 @@ import org.slf4j.LoggerFactory;
 
 import eu.larkc.csparql.cep.api.RdfQuadruple;
 import eu.larkc.csparql.cep.api.RdfStream;
+import lu.jpt.csparqlproject.Main;
 import lu.jpt.csparqlproject.util.WindowLoggingRdfStream;
 
 /**
@@ -40,6 +41,7 @@ public class RentACarSimulation implements Runnable {
 	
 	
 	public RentACarSimulation() {
+		this.registerOwnPrefixes();
 		int numberOfCars = 1;
 		int numberOfCustomers = 1;
 		// Create a car pool and drivers
@@ -58,6 +60,13 @@ public class RentACarSimulation implements Runnable {
 		this.pauseSimulation = false;
 	}
 	
+	private void registerOwnPrefixes() {
+		Main.prefixManager.registerPrefix("event", RentACarSimulation.BASE_OBJECT_IRI+"/event#");
+		Main.prefixManager.registerPrefix("carOnt", RentACarSimulation.BASE_ONTOLOGY_IRI);
+		Main.prefixManager.registerPrefix("car", RentACarSimulation.BASE_OBJECT_IRI+"/Car#");
+		Main.prefixManager.registerPrefix("driver", RentACarSimulation.BASE_OBJECT_IRI+"/Driver#");
+	}
+	
 	public RdfStream getCarStream() {
 		return this.carStream;
 	}

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;
+	}
+	
+}