110 lines
4.8 KiB
Java
110 lines
4.8 KiB
Java
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Rhino code, released
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* May 6, 1999.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1997-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bob Jervis
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License Version 2 or later (the "GPL"), in which
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* case the provisions of the GPL are applicable instead of those above. If
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* you wish to allow use of your version of this file only under the terms of
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* the GPL and not to allow others to use your version of this file under the
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* MPL, indicate your decision by deleting the provisions above and replacing
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* them with the notice and other provisions required by the GPL. If you do
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* not delete the provisions above, a recipient may use your version of this
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* file under either the MPL or the GPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// API class
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package org.mozilla.javascript;
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public interface ConstProperties {
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/**
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* Sets a named const property in this object.
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* <p>
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* The property is specified by a string name
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* as defined for <code>Scriptable.get</code>.
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* <p>
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* The possible values that may be passed in are as defined for
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* <code>Scriptable.get</code>. A class that implements this method may choose
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* to ignore calls to set certain properties, in which case those
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* properties are effectively read-only.<p>
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* For properties defined in a prototype chain,
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* use <code>putProperty</code> in ScriptableObject. <p>
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* Note that if a property <i>a</i> is defined in the prototype <i>p</i>
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* of an object <i>o</i>, then evaluating <code>o.a = 23</code> will cause
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* <code>set</code> to be called on the prototype <i>p</i> with
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* <i>o</i> as the <i>start</i> parameter.
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* To preserve JavaScript semantics, it is the Scriptable
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* object's responsibility to modify <i>o</i>. <p>
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* This design allows properties to be defined in prototypes and implemented
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* in terms of getters and setters of Java values without consuming slots
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* in each instance.<p>
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* <p>
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* The values that may be set are limited to the following:
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* <UL>
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* <LI>java.lang.Boolean objects</LI>
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* <LI>java.lang.String objects</LI>
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* <LI>java.lang.Number objects</LI>
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* <LI>org.mozilla.javascript.Scriptable objects</LI>
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* <LI>null</LI>
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* <LI>The value returned by Context.getUndefinedValue()</LI>
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* </UL><p>
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* Arbitrary Java objects may be wrapped in a Scriptable by first calling
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* <code>Context.toObject</code>. This allows the property of a JavaScript
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* object to contain an arbitrary Java object as a value.<p>
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* Note that <code>has</code> will be called by the runtime first before
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* <code>set</code> is called to determine in which object the
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* property is defined.
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* Note that this method is not expected to traverse the prototype chain,
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* which is different from the ECMA [[Put]] operation.
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* @param name the name of the property
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* @param start the object whose property is being set
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* @param value value to set the property to
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* @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
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* @see org.mozilla.javascript.Scriptable#get(String, Scriptable)
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* @see org.mozilla.javascript.ScriptableObject#putProperty(Scriptable, String, Object)
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* @see org.mozilla.javascript.Context#toObject(Object, Scriptable)
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*/
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public void putConst(String name, Scriptable start, Object value);
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/**
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* Reserves a definition spot for a const. This will set up a definition
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* of the const property, but set its value to undefined. The semantics of
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* the start parameter is the same as for putConst.
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* @param name The name of the property.
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* @param start The object whose property is being reserved.
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*/
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public void defineConst(String name, Scriptable start);
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/**
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* Returns true if the named property is defined as a const on this object.
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* @param name
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* @return true if the named property is defined as a const, false
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* otherwise.
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*/
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public boolean isConst(String name);
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}
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