FrozenArrayFilter.java revision 1571:fd97b9047199 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.nashorn.internal.runtime.arrays;
27
28import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
29import jdk.nashorn.internal.objects.Global;
30import jdk.nashorn.internal.runtime.PropertyDescriptor;
31import jdk.nashorn.internal.runtime.ScriptRuntime;
32
33/**
34 * ArrayData after the array has been frozen by Object.freeze call.
35 */
36final class FrozenArrayFilter extends SealedArrayFilter {
37    FrozenArrayFilter(final ArrayData underlying) {
38        super(underlying);
39    }
40
41    @Override
42    public ArrayData copy() {
43        return this;
44    }
45
46    @Override
47    public PropertyDescriptor getDescriptor(final Global global, final int index) {
48        return global.newDataDescriptor(getObject(index), false, true, false);
49    }
50
51    @Override
52    public ArrayData set(final int index, final int value, final boolean strict) {
53        if (strict) {
54            throw typeError("cant.set.property", Integer.toString(index), "frozen array");
55        }
56        return this;
57    }
58
59    @Override
60    public ArrayData set(final int index, final double value, final boolean strict) {
61        if (strict) {
62            throw typeError("cant.set.property", Integer.toString(index), "frozen array");
63        }
64        return this;
65    }
66
67    @Override
68    public ArrayData set(final int index, final Object value, final boolean strict) {
69        if (strict) {
70            throw typeError("cant.set.property", Integer.toString(index), "frozen array");
71        }
72        return this;
73    }
74
75    @Override
76    public ArrayData push(final boolean strict, final Object... items) {
77        return this; //nop
78    }
79
80    @Override
81    public Object pop() {
82        final int len = (int)underlying.length();
83        return len == 0 ? ScriptRuntime.UNDEFINED : underlying.getObject(len - 1);
84    }
85}
86