Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
IndirectSequenceExpression |
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IndirectSequenceExpression$1 |
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1 | /* | |
2 | * Copyright 2008 Sun Microsystems, Inc. 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. Sun designates this | |
8 | * particular file as subject to the "Classpath" exception as provided | |
9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
22 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
23 | * have any questions. | |
24 | */ | |
25 | ||
26 | package com.sun.javafx.runtime.location; | |
27 | ||
28 | import com.sun.javafx.runtime.sequence.Sequence; | |
29 | ||
30 | /** | |
31 | * Indirect locations are used to express bindings that respond nonuniformly with respect to dependencies. For example, | |
32 | * bind a.b will change when a changes or when a.b changes, but the response to changes is different. If a.b changes but | |
33 | * a doesn't, the response is simply to update the value; if a changes, the response also includes updating the | |
34 | * dependency set as well, removing the old a.b and adding the new one. | |
35 | * | |
36 | * Indirect location instances are created with a set of static dependencies; in the example above, a would be a static | |
37 | * dependency. Instances override computeLocation(), which returns a Location with its secondary dependencies set up; | |
38 | * in the example above, calling computeLocation() would evaluate a, and return a location corresponding to a.b. | |
39 | * | |
40 | * @author Brian Goetz | |
41 | */ | |
42 | 919 | public abstract class IndirectSequenceExpression<T> extends SequenceVariable<T> implements IndirectLocation<SequenceLocation<T>> { |
43 | ||
44 | protected final IndirectLocationHelper<SequenceLocation<T>> helper; | |
45 | ||
46 | public IndirectSequenceExpression(Class<T> clazz, boolean lazy, Location... dependencies) { | |
47 | 404 | super(clazz); |
48 | 404 | helper = new IndirectLocationHelper<SequenceLocation<T>>(this, dependencies); |
49 | 404 | bind(lazy, new SequenceBindingExpression<T>() { |
50 | public Sequence<? extends T> computeValue() { | |
51 | 920 | return helper.get().getAsSequence(); |
52 | } | |
53 | }); | |
54 | 404 | } |
55 | ||
56 | public final SequenceLocation<T> computeLocationInternal() { | |
57 | 919 | return computeLocation(); |
58 | } | |
59 | ||
60 | protected abstract SequenceLocation<T> computeLocation(); | |
61 | ||
62 | public SequenceLocation<T> getUnderlyingLocation() { | |
63 | 0 | return computeLocation(); |
64 | } | |
65 | } |