Source Code Cross Referenced for ConstProperties.java in  » Scripting » rhino » org » mozilla » javascript » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » rhino » org.mozilla.javascript 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
002:         *
003:         * ***** BEGIN LICENSE BLOCK *****
004:         * Version: MPL 1.1/GPL 2.0
005:         *
006:         * The contents of this file are subject to the Mozilla Public License Version
007:         * 1.1 (the "License"); you may not use this file except in compliance with
008:         * the License. You may obtain a copy of the License at
009:         * http://www.mozilla.org/MPL/
010:         *
011:         * Software distributed under the License is distributed on an "AS IS" basis,
012:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
013:         * for the specific language governing rights and limitations under the
014:         * License.
015:         *
016:         * The Original Code is Rhino code, released
017:         * May 6, 1999.
018:         *
019:         * The Initial Developer of the Original Code is
020:         * Netscape Communications Corporation.
021:         * Portions created by the Initial Developer are Copyright (C) 1997-1999
022:         * the Initial Developer. All Rights Reserved.
023:         *
024:         * Contributor(s):
025:         *   Bob Jervis
026:         *
027:         * Alternatively, the contents of this file may be used under the terms of
028:         * the GNU General Public License Version 2 or later (the "GPL"), in which
029:         * case the provisions of the GPL are applicable instead of those above. If
030:         * you wish to allow use of your version of this file only under the terms of
031:         * the GPL and not to allow others to use your version of this file under the
032:         * MPL, indicate your decision by deleting the provisions above and replacing
033:         * them with the notice and other provisions required by the GPL. If you do
034:         * not delete the provisions above, a recipient may use your version of this
035:         * file under either the MPL or the GPL.
036:         *
037:         * ***** END LICENSE BLOCK ***** */
038:
039:        // API class
040:        package org.mozilla.javascript;
041:
042:        public interface ConstProperties {
043:            /**
044:             * Sets a named const property in this object.
045:             * <p>
046:             * The property is specified by a string name
047:             * as defined for <code>Scriptable.get</code>.
048:             * <p>
049:             * The possible values that may be passed in are as defined for
050:             * <code>Scriptable.get</code>. A class that implements this method may choose
051:             * to ignore calls to set certain properties, in which case those
052:             * properties are effectively read-only.<p>
053:             * For properties defined in a prototype chain,
054:             * use <code>putProperty</code> in ScriptableObject. <p>
055:             * Note that if a property <i>a</i> is defined in the prototype <i>p</i>
056:             * of an object <i>o</i>, then evaluating <code>o.a = 23</code> will cause
057:             * <code>set</code> to be called on the prototype <i>p</i> with
058:             * <i>o</i> as the  <i>start</i> parameter.
059:             * To preserve JavaScript semantics, it is the Scriptable
060:             * object's responsibility to modify <i>o</i>. <p>
061:             * This design allows properties to be defined in prototypes and implemented
062:             * in terms of getters and setters of Java values without consuming slots
063:             * in each instance.<p>
064:             * <p>
065:             * The values that may be set are limited to the following:
066:             * <UL>
067:             * <LI>java.lang.Boolean objects</LI>
068:             * <LI>java.lang.String objects</LI>
069:             * <LI>java.lang.Number objects</LI>
070:             * <LI>org.mozilla.javascript.Scriptable objects</LI>
071:             * <LI>null</LI>
072:             * <LI>The value returned by Context.getUndefinedValue()</LI>
073:             * </UL><p>
074:             * Arbitrary Java objects may be wrapped in a Scriptable by first calling
075:             * <code>Context.toObject</code>. This allows the property of a JavaScript
076:             * object to contain an arbitrary Java object as a value.<p>
077:             * Note that <code>has</code> will be called by the runtime first before
078:             * <code>set</code> is called to determine in which object the
079:             * property is defined.
080:             * Note that this method is not expected to traverse the prototype chain,
081:             * which is different from the ECMA [[Put]] operation.
082:             * @param name the name of the property
083:             * @param start the object whose property is being set
084:             * @param value value to set the property to
085:             * @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
086:             * @see org.mozilla.javascript.Scriptable#get(String, Scriptable)
087:             * @see org.mozilla.javascript.ScriptableObject#putProperty(Scriptable, String, Object)
088:             * @see org.mozilla.javascript.Context#toObject(Object, Scriptable)
089:             */
090:            public void putConst(String name, Scriptable start, Object value);
091:
092:            /**
093:             * Reserves a definition spot for a const.  This will set up a definition
094:             * of the const property, but set its value to undefined.  The semantics of
095:             * the start parameter is the same as for putConst.
096:             * @param name The name of the property.
097:             * @param start The object whose property is being reserved.
098:             */
099:            public void defineConst(String name, Scriptable start);
100:
101:            /**
102:             * Returns true if the named property is defined as a const on this object.
103:             * @param name
104:             * @return true if the named property is defined as a const, false
105:             * otherwise.
106:             */
107:            public boolean isConst(String name);
108:        }
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