--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.jpackage/share/classes/jdk/incubator/jpackage/internal/BundlerParamInfo.java	Fri Nov 08 14:53:03 2019 -0500
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.incubator.jpackage.internal;
+
+import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+/**
+ * BundlerParamInfo<T>
+ *
+ * A BundlerParamInfo encapsulates an individual bundler parameter of type <T>.
+ */
+class BundlerParamInfo<T> {
+
+    /**
+     * The command line and hashmap name of the parameter
+     */
+    String id;
+
+    /**
+     * Type of the parameter
+     */
+    Class<T> valueType;
+
+    /**
+     * Indicates if value was set using default value function
+     */
+    boolean isDefaultValue;
+
+    /**
+     * If the value is not set, and no fallback value is found,
+     * the parameter uses the value returned by the producer.
+     */
+    Function<Map<String, ? super Object>, T> defaultValueFunction;
+
+    /**
+     * An optional string converter for command line arguments.
+     */
+    BiFunction<String, Map<String, ? super Object>, T> stringConverter;
+
+    String getID() {
+        return id;
+    }
+
+    Class<T> getValueType() {
+        return valueType;
+    }
+
+    boolean getIsDefaultValue() {
+        return isDefaultValue;
+    }
+
+    Function<Map<String, ? super Object>, T> getDefaultValueFunction() {
+        return defaultValueFunction;
+    }
+
+    BiFunction<String, Map<String, ? super Object>,T>
+            getStringConverter() {
+        return stringConverter;
+    }
+
+    @SuppressWarnings("unchecked")
+    final T fetchFrom(Map<String, ? super Object> params) {
+        return fetchFrom(params, true);
+    }
+
+    @SuppressWarnings("unchecked")
+    final T fetchFrom(Map<String, ? super Object> params,
+            boolean invokeDefault) {
+        Object o = params.get(getID());
+        if (o instanceof String && getStringConverter() != null) {
+            return getStringConverter().apply((String)o, params);
+        }
+
+        Class<T> klass = getValueType();
+        if (klass.isInstance(o)) {
+            return (T) o;
+        }
+        if (o != null) {
+            throw new IllegalArgumentException("Param " + getID()
+                    + " should be of type " + getValueType()
+                    + " but is a " + o.getClass());
+        }
+        if (params.containsKey(getID())) {
+            // explicit nulls are allowed
+            return null;
+        }
+
+        if (invokeDefault && (getDefaultValueFunction() != null)) {
+            T result =  getDefaultValueFunction().apply(params);
+            if (result != null) {
+                params.put(getID(), result);
+                isDefaultValue = true;
+            }
+            return result;
+        }
+
+        // ultimate fallback
+        return null;
+    }
+}