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diff --git a/trunk/infrastructure/rhino1_7R1/toolsrc/org/mozilla/javascript/tools/shell/Environment.java b/trunk/infrastructure/rhino1_7R1/toolsrc/org/mozilla/javascript/tools/shell/Environment.java
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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1997-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License Version 2 or later (the "GPL"), in which
+ * case the provisions of the GPL are applicable instead of those above. If
+ * you wish to allow use of your version of this file only under the terms of
+ * the GPL and not to allow others to use your version of this file under the
+ * MPL, indicate your decision by deleting the provisions above and replacing
+ * them with the notice and other provisions required by the GPL. If you do
+ * not delete the provisions above, a recipient may use your version of this
+ * file under either the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+        Environment.java
+
+        Wraps java.lang.System properties.
+
+        by Patrick C. Beard <beard@netscape.com>
+ */
+
+package org.mozilla.javascript.tools.shell;
+
+import org.mozilla.javascript.Scriptable;
+import org.mozilla.javascript.ScriptRuntime;
+import org.mozilla.javascript.ScriptableObject;
+
+import java.util.Vector;
+import java.util.Enumeration;
+import java.util.Properties;
+
+/**
+ * Environment, intended to be instantiated at global scope, provides
+ * a natural way to access System properties from JavaScript.
+ *
+ * @author Patrick C. Beard
+ */
+public class Environment extends ScriptableObject
+{
+    static final long serialVersionUID = -430727378460177065L;
+
+    private Environment thePrototypeInstance = null;
+
+    public static void defineClass(ScriptableObject scope) {
+        try {
+            ScriptableObject.defineClass(scope, Environment.class);
+        } catch (Exception e) {
+            throw new Error(e.getMessage());
+        }
+    }
+
+    public String getClassName() {
+        return "Environment";
+    }
+
+    public Environment() {
+        if (thePrototypeInstance == null)
+            thePrototypeInstance = this;
+    }
+
+    public Environment(ScriptableObject scope) {
+        setParentScope(scope);
+        Object ctor = ScriptRuntime.getTopLevelProp(scope, "Environment");
+        if (ctor != null && ctor instanceof Scriptable) {
+            Scriptable s = (Scriptable) ctor;
+            setPrototype((Scriptable) s.get("prototype", s));
+        }
+    }
+
+    public boolean has(String name, Scriptable start) {
+        if (this == thePrototypeInstance)
+            return super.has(name, start);
+
+        return (System.getProperty(name) != null);
+    }
+
+    public Object get(String name, Scriptable start) {
+        if (this == thePrototypeInstance)
+            return super.get(name, start);
+
+        String result = System.getProperty(name);
+        if (result != null)
+            return ScriptRuntime.toObject(getParentScope(), result);
+        else
+            return Scriptable.NOT_FOUND;
+    }
+
+    public void put(String name, Scriptable start, Object value) {
+        if (this == thePrototypeInstance)
+            super.put(name, start, value);
+        else
+            System.getProperties().put(name, ScriptRuntime.toString(value));
+    }
+
+    private Object[] collectIds() {
+        Properties props = System.getProperties();
+        Enumeration names = props.propertyNames();
+        Vector keys = new Vector();
+        while (names.hasMoreElements())
+            keys.addElement(names.nextElement());
+        Object[] ids = new Object[keys.size()];
+        keys.copyInto(ids);
+        return ids;
+    }
+
+    public Object[] getIds() {
+        if (this == thePrototypeInstance)
+            return super.getIds();
+        return collectIds();
+    }
+
+    public Object[] getAllIds() {
+        if (this == thePrototypeInstance)
+            return super.getAllIds();
+        return collectIds();
+    }
+}