Added a getLabels() method to the explicit.Model hierarchty (from Joachim Klein).

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@9156 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/explicit/Model.java

@@ -30,6 +30,7 @@ import java.io.File;
 import java.util.BitSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import parser.State;
 import parser.Values;
@@ -124,6 +125,12 @@ public interface Model
 	 */
 	public BitSet getLabelStates(String name);
 	
+	/**
+	 * Get the labels that are (optionally) stored.
+	 * Returns an empty set if there are no labels.
+	 */
+	public Set<String> getLabels();
+	
 	/**
 	 * Get the total number of transitions in the model.
 	 */

prism/src/explicit/ModelExplicit.java

@@ -31,6 +31,7 @@ import java.util.ArrayList;
 import java.util.BitSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.TreeMap;
 import java.util.TreeSet;
 
@@ -262,6 +263,12 @@ public abstract class ModelExplicit implements Model
 		return labels.get(name);
 	}
 
+	@Override
+	public Set<String> getLabels()
+	{
+		return labels.keySet();
+	}
+	
 	@Override
 	public abstract int getNumTransitions();
 

prism/src/explicit/SubNondetModel.java

@@ -34,6 +34,7 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import parser.State;
 import parser.Values;
@@ -173,6 +174,11 @@ public class SubNondetModel implements NondetModel
 		throw new UnsupportedOperationException();
 	}
 	
+	@Override
+	public Set<String> getLabels() {
+		throw new UnsupportedOperationException();
+	}
+
 	@Override
 	public BitSet getLabelStates(String name)
 	{