Make exceptions public top-level classes (jgrapht#1049)

jgrapht-core/src/main/java/org/jgrapht/graph/GraphWalk.java

@@ -527,19 +527,3 @@ public static <V, E> GraphWalk<V, E> singletonWalk(Graph<V, E> graph, V v, doubl
     }
 
 }
-
-/**
- * Exception thrown in the event that the path is invalid.
- */
-class InvalidGraphWalkException
-    extends
-    RuntimeException
-{
-    private static final long serialVersionUID = 3811666107707436479L;
-
-    public InvalidGraphWalkException(String message)
-    {
-        super(message);
-    }
-
-}

jgrapht-core/src/main/java/org/jgrapht/graph/InvalidGraphWalkException.java

@@ -0,0 +1,34 @@
+/*
+ * (C) Copyright 2017-2021, by Joris Kinable and Contributors.
+ *
+ * JGraphT : a free Java graph-theory library
+ *
+ * See the CONTRIBUTORS.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the
+ * GNU Lesser General Public License v2.1 or later
+ * which is available at
+ * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
+ */
+package org.jgrapht.graph;
+
+/**
+ * Exception thrown in the event that the path is invalid.
+ */
+public class InvalidGraphWalkException
+    extends
+    RuntimeException
+{
+    private static final long serialVersionUID = 3811666107707436479L;
+
+    public InvalidGraphWalkException(String message)
+    {
+        super(message);
+    }
+
+}

jgrapht-core/src/main/java/org/jgrapht/util/SupplierException.java

@@ -0,0 +1,37 @@
+/*
+ * (C) Copyright 2021-2021, by Hannes Wellmann and Contributors.
+ *
+ * JGraphT : a free Java graph-theory library
+ *
+ * See the CONTRIBUTORS.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the
+ * GNU Lesser General Public License v2.1 or later
+ * which is available at
+ * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
+ */
+package org.jgrapht.util;
+
+import java.util.function.*;
+
+/**
+ * Exception thrown to indicate that a {@link Supplier} is in an invalid state.
+ * 
+ * @author Hannes Wellmann
+ */
+public class SupplierException
+    extends
+    IllegalArgumentException
+{
+    private static final long serialVersionUID = -8192314371524515620L;
+
+    public SupplierException(String message, Throwable cause)
+    {
+        super(message, cause);
+    }
+}

jgrapht-core/src/main/java/org/jgrapht/util/SupplierUtil.java

@@ -252,16 +252,4 @@ Object writeReplace()
             return new SerializedForm<>(constructor.getDeclaringClass());
         }
     }
-
-    static class SupplierException
-        extends
-        IllegalArgumentException
-    {
-        private static final long serialVersionUID = -8192314371524515620L;
-
-        public SupplierException(String message, Throwable cause)
-        {
-            super(message, cause);
-        }
-    }
 }