Source Code Cross Referenced for SpecialRef.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:         *   Igor Bukanov, igor@fastmail.fm
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:        package org.mozilla.javascript;
040:
041:        class SpecialRef extends Ref {
042:            static final long serialVersionUID = -7521596632456797847L;
043:
044:            private static final int SPECIAL_NONE = 0;
045:            private static final int SPECIAL_PROTO = 1;
046:            private static final int SPECIAL_PARENT = 2;
047:
048:            private Scriptable target;
049:            private int type;
050:            private String name;
051:
052:            private SpecialRef(Scriptable target, int type, String name) {
053:                this .target = target;
054:                this .type = type;
055:                this .name = name;
056:            }
057:
058:            static Ref createSpecial(Context cx, Object object, String name) {
059:                Scriptable target = ScriptRuntime.toObjectOrNull(cx, object);
060:                if (target == null) {
061:                    throw ScriptRuntime.undefReadError(object, name);
062:                }
063:
064:                int type;
065:                if (name.equals("__proto__")) {
066:                    type = SPECIAL_PROTO;
067:                } else if (name.equals("__parent__")) {
068:                    type = SPECIAL_PARENT;
069:                } else {
070:                    throw new IllegalArgumentException(name);
071:                }
072:
073:                if (!cx.hasFeature(Context.FEATURE_PARENT_PROTO_PROPERTIES)) {
074:                    // Clear special after checking for valid name!
075:                    type = SPECIAL_NONE;
076:                }
077:
078:                return new SpecialRef(target, type, name);
079:            }
080:
081:            public Object get(Context cx) {
082:                switch (type) {
083:                case SPECIAL_NONE:
084:                    return ScriptRuntime.getObjectProp(target, name, cx);
085:                case SPECIAL_PROTO:
086:                    return target.getPrototype();
087:                case SPECIAL_PARENT:
088:                    return target.getParentScope();
089:                default:
090:                    throw Kit.codeBug();
091:                }
092:            }
093:
094:            public Object set(Context cx, Object value) {
095:                switch (type) {
096:                case SPECIAL_NONE:
097:                    return ScriptRuntime.setObjectProp(target, name, value, cx);
098:                case SPECIAL_PROTO:
099:                case SPECIAL_PARENT: {
100:                    Scriptable obj = ScriptRuntime.toObjectOrNull(cx, value);
101:                    if (obj != null) {
102:                        // Check that obj does not contain on its prototype/scope
103:                        // chain to prevent cycles
104:                        Scriptable search = obj;
105:                        do {
106:                            if (search == target) {
107:                                throw Context.reportRuntimeError1(
108:                                        "msg.cyclic.value", name);
109:                            }
110:                            if (type == SPECIAL_PROTO) {
111:                                search = search.getPrototype();
112:                            } else {
113:                                search = search.getParentScope();
114:                            }
115:                        } while (search != null);
116:                    }
117:                    if (type == SPECIAL_PROTO) {
118:                        target.setPrototype(obj);
119:                    } else {
120:                        target.setParentScope(obj);
121:                    }
122:                    return obj;
123:                }
124:                default:
125:                    throw Kit.codeBug();
126:                }
127:            }
128:
129:            public boolean has(Context cx) {
130:                if (type == SPECIAL_NONE) {
131:                    return ScriptRuntime.hasObjectElem(target, name, cx);
132:                }
133:                return true;
134:            }
135:
136:            public boolean delete(Context cx) {
137:                if (type == SPECIAL_NONE) {
138:                    return ScriptRuntime.deleteObjectElem(target, name, cx);
139:                }
140:                return false;
141:            }
142:        }
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