JDD: add multi-operand And and Or methods (convenience wrappers around binary And / Or)

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11221 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/jdd/JDD.java

@@ -380,6 +380,30 @@ public class JDD
 		}
 		return ptrToNode(DD_Or(dd1.ptr(), dd2.ptr()));
 	}
+
+	/**
+	 * Multi-operand Or (0/1-MTBDD disjunction) operation.
+	 * Operands are processed from left-to-right.
+	 * <br>
+	 * Returns JDD.Constant(0) for empty argument list
+	 * <br>[ REFS: <i>result</i>, DEREFS: <i>all arguments</i> ]
+	 */
+	public static JDDNode Or(JDDNode... nodes)
+	{
+		if (nodes.length == 0)
+			return JDD.Constant(0);
+
+		JDDNode result = nodes[0];
+		for (int i = 1; i < nodes.length; i++) {
+			// note: Java overloading rules ensure that fixed arity
+			// methods take precedence. So, for two-operand Or,
+			// the Or(JDDNode,JDDNode) method above is called and we don't
+			// run into an infinite recursion
+			result = Or(result, nodes[i]);
+		}
+
+		return result;
+	}
 	
 	/**
 	 * and of dd1, dd2
@@ -394,7 +418,31 @@ public class JDD
 			
 		return ptrToNode(DD_And(dd1.ptr(), dd2.ptr()));
 	}
-	
+
+	/**
+	 * Multi-operand And (0/1-MTBDD conjunction) operation.
+	 * Operands are processed from left-to-right.
+	 * <br>
+	 * Returns JDD.Constant(1) for empty argument list
+	 * <br>[ REFS: <i>result</i>, DEREFS: <i>all arguments</i> ]
+	 */
+	public static JDDNode And(JDDNode... nodes)
+	{
+		if (nodes.length == 0)
+			return JDD.Constant(1);
+
+		JDDNode result = nodes[0];
+		for (int i = 1; i < nodes.length; i++) {
+			// note: Java overloading rules ensure that fixed arity
+			// methods take precedence. So, for two-operand And,
+			// the And(JDDNode,JDDNode) method above is called and we don't
+			// run into an infinite recursion
+			result = And(result, nodes[i]);
+		}
+
+		return result;
+	}
+
 	/**
 	 * xor of dd1, dd2
 	 * <br>[ REFS: <i>result</i>, DEREFS: dd1, dd2 ]