ModelInfo: provide getVarIndex() and getVarName()

Default implementation relies on the getVarNames() method


git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11079 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/DefaultModelGenerator.java

@@ -71,6 +71,18 @@ public abstract class DefaultModelGenerator implements ModelGenerator
 	@Override
 	public abstract List<String> getVarNames();
 
+	@Override
+	public int getVarIndex(String name)
+	{
+		return getVarNames().indexOf(name);
+	}
+
+	@Override
+	public String getVarName(int i)
+	{
+		return getVarNames().get(i);
+	}
+
 	@Override
 	public abstract List<Type> getVarTypes();
 	

prism/src/prism/ModelInfo.java

@@ -78,10 +78,16 @@ public interface ModelInfo
 	 */
 	public List<Type> getVarTypes();
 
+	/**
+	 * Look up the index of a variable in the model by name.
+	 * Returns -1 if there is no such variable.
+	 */
+	public int getVarIndex(String name);
+
 	/**
 	 * Get the name of the {@code i}th variable in the model.
 	 */
-	//public String getVarName(int i) throws PrismException;
+	public String getVarName(int i);
 
 	/**
 	 * Get the type of the {@code i}th variable in the model.