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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, 1999.
+ *
+ * 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):
+ *   Bob Jervis
+ *
+ * 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 ***** */
+
+// API class
+
+package org.mozilla.javascript;
+
+public interface ConstProperties {
+    /**
+     * Sets a named const property in this object.
+     * <p>
+     * The property is specified by a string name
+     * as defined for <code>Scriptable.get</code>.
+     * <p>
+     * The possible values that may be passed in are as defined for
+     * <code>Scriptable.get</code>. A class that implements this method may choose
+     * to ignore calls to set certain properties, in which case those
+     * properties are effectively read-only.<p>
+     * For properties defined in a prototype chain,
+     * use <code>putProperty</code> in ScriptableObject. <p>
+     * Note that if a property <i>a</i> is defined in the prototype <i>p</i>
+     * of an object <i>o</i>, then evaluating <code>o.a = 23</code> will cause
+     * <code>set</code> to be called on the prototype <i>p</i> with
+     * <i>o</i> as the  <i>start</i> parameter.
+     * To preserve JavaScript semantics, it is the Scriptable
+     * object's responsibility to modify <i>o</i>. <p>
+     * This design allows properties to be defined in prototypes and implemented
+     * in terms of getters and setters of Java values without consuming slots
+     * in each instance.<p>
+     * <p>
+     * The values that may be set are limited to the following:
+     * <UL>
+     * <LI>java.lang.Boolean objects</LI>
+     * <LI>java.lang.String objects</LI>
+     * <LI>java.lang.Number objects</LI>
+     * <LI>org.mozilla.javascript.Scriptable objects</LI>
+     * <LI>null</LI>
+     * <LI>The value returned by Context.getUndefinedValue()</LI>
+     * </UL><p>
+     * Arbitrary Java objects may be wrapped in a Scriptable by first calling
+     * <code>Context.toObject</code>. This allows the property of a JavaScript
+     * object to contain an arbitrary Java object as a value.<p>
+     * Note that <code>has</code> will be called by the runtime first before
+     * <code>set</code> is called to determine in which object the
+     * property is defined.
+     * Note that this method is not expected to traverse the prototype chain,
+     * which is different from the ECMA [[Put]] operation.
+     * @param name the name of the property
+     * @param start the object whose property is being set
+     * @param value value to set the property to
+     * @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
+     * @see org.mozilla.javascript.Scriptable#get(String, Scriptable)
+     * @see org.mozilla.javascript.ScriptableObject#putProperty(Scriptable, String, Object)
+     * @see org.mozilla.javascript.Context#toObject(Object, Scriptable)
+     */
+    public void putConst(String name, Scriptable start, Object value);
+
+    /**
+     * Reserves a definition spot for a const.  This will set up a definition
+     * of the const property, but set its value to undefined.  The semantics of
+     * the start parameter is the same as for putConst.
+     * @param name The name of the property.
+     * @param start The object whose property is being reserved.
+     */
+    public void defineConst(String name, Scriptable start);
+
+    /**
+     * Returns true if the named property is defined as a const on this object.
+     * @param name
+     * @return true if the named property is defined as a const, false
+     * otherwise.
+     */
+    public boolean isConst(String name);
+}