From 5d7edb5b7082cab26ba33c91262c3cd01707ab3c Mon Sep 17 00:00:00 2001
From: Joachim Klein <klein@tcs.inf.tu-dresden.de>
Date: Fri, 12 Oct 2018 14:25:50 +0200
Subject: [PATCH] imported patch common-SafeCast.patch

---
 prism/src/common/SafeCast.java | 97 ++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 prism/src/common/SafeCast.java

diff --git a/prism/src/common/SafeCast.java b/prism/src/common/SafeCast.java
new file mode 100644
index 00000000..108c4189
--- /dev/null
+++ b/prism/src/common/SafeCast.java
@@ -0,0 +1,97 @@
+//==============================================================================
+//	
+//	Copyright (c) 2018-
+//	Authors:
+//	* Joachim Klein <klein@tcs.inf.tu-dresden.de> (TU Dresden)
+//	* Steffen Märcker <steffen.maercker@tu-dresden.de> (TU Dresden)
+//	
+//------------------------------------------------------------------------------
+//	
+//	This file is part of PRISM.
+//	
+//	PRISM is free software; you can redistribute it and/or modify
+//	it under the terms of the GNU General Public License as published by
+//	the Free Software Foundation; either version 2 of the License, or
+//	(at your option) any later version.
+//	
+//	PRISM is distributed in the hope that it will be useful,
+//	but WITHOUT ANY WARRANTY; without even the implied warranty of
+//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//	GNU General Public License for more details.
+//	
+//	You should have received a copy of the GNU General Public License
+//	along with PRISM; if not, write to the Free Software Foundation,
+//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//	
+//==============================================================================
+
+package common;
+
+import prism.PrismException;
+
+/**
+ * This class provides utility methods to allow the detection of
+ * primitive cast errors, e.g. like overflows and special values.
+ */
+public class SafeCast
+{
+	/**
+	 * Convert a primitive {@code double }value to a primitive {@code int} value,
+	 * throwing an exception if the value can not be exactly represented as an {@code int}.
+	 * Wrapper method for toIntExact, converting an ArithmeticException to a PrismExeption.
+	 *
+	 * @param value {@code double} value
+	 * @return the corresponding {@code int} value
+	 * @throws PrismException if the value cannot be converted to {@code int}
+	 */
+	public static int toInt(double value) throws PrismException
+	{
+		try {
+			return toIntExact(value);
+		} catch (ArithmeticException e) {
+			throw new PrismException(e.getMessage());
+		}
+	}
+
+	/**
+	 * Convert a primitive {@code double} to a primitive {@code int} value,
+	 * throwing an exception if the value can not be exactly represented as an {@code int}.
+	 *
+	 * @param value {@code double} value
+	 * @return the corresponding {@code int} value
+	 * @throws ArithmeticException if the value cannot be converted to {@code int}
+	 */
+	public static int toIntExact(double value)
+	{
+		if (!Double.isFinite(value)) {
+			throw new ArithmeticException(value + " is non-finite, cannot be represented by int");
+		}
+
+		if ((int) value != value) {
+			throw new ArithmeticException(value + " cannot be losslessly converted to int");
+		}
+
+		return (int) value;
+	}
+
+	/**
+	 * Convert a primitive double to a primitive long value
+	 * throwing an exception if the value is a special value or not an {@code long}.
+	 *
+	 * @param value {@code double} value
+	 * @return the equivalent {@code long} value
+	 * @throws ArithmeticException if the value cannot be converted to {@code long}
+	 */
+	public static long toLongExact(double value)
+	{
+		if (!Double.isFinite(value)) {
+			throw new ArithmeticException(value + " is non-finite, cannot be represented by long");
+		}
+
+		if ((long) value != value) {
+			throw new ArithmeticException(value + " cannot be losslessly converted to long");
+		}
+		return (long) value;
+	}
+
+}