1 /*
 2  * Copyright (c) 2024, 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 package wrap;
26 
27 import java.lang.foreign.GroupLayout;
28 import java.lang.foreign.MemoryLayout;
29 import java.lang.foreign.ValueLayout;
30 import java.util.ArrayList;
31 import java.util.List;
32 import java.util.function.Consumer;
33 
34 import static java.lang.foreign.MemoryLayout.structLayout;
35 import static java.lang.foreign.MemoryLayout.unionLayout;
36 import static java.lang.foreign.ValueLayout.JAVA_INT;
37 import static java.lang.foreign.ValueLayout.JAVA_LONG;
38 
39 public class LayoutBuilder {
40     //String name;
41     List<MemoryLayout> layouts = new ArrayList<>();
42 
43     // final public MemoryLayout memoryLayout;
44     LayoutBuilder() {
45         //this.memoryLayout = memoryLayout;
46     }
47 
48     LayoutBuilder struct(String name, Consumer<LayoutBuilder> consumer) {
49         LayoutBuilder lb = new LayoutBuilder();
50         consumer.accept(lb);
51         MemoryLayout layout = structLayout(lb.layouts.toArray(new MemoryLayout[0]));
52         if (name != null) {
53             layout.withName(name);
54         }
55         layouts.add(layout);
56         return this;
57     }
58 
59     LayoutBuilder union(String name, Consumer<LayoutBuilder> consumer) {
60         LayoutBuilder lb = new LayoutBuilder();
61         consumer.accept(lb);
62         MemoryLayout layout = unionLayout(lb.layouts.toArray(new MemoryLayout[0]));
63         if (name != null) {
64             layout.withName(name);
65         }
66         layouts.add(layout);
67         return this;
68     }
69 
70     public LayoutBuilder i32(String name) {
71         layouts.add(JAVA_INT.withName(name));
72         return this;
73     }
74     public LayoutBuilder i64(String name) {
75         layouts.add(JAVA_LONG.withName(name));
76         return this;
77     }
78 
79     public MemoryLayout memoryLayout(){
80         return layouts.getFirst();
81     }
82 
83     public LayoutBuilder i8Seq(String name, long elementCount) {
84         layouts.add(MemoryLayout.sequenceLayout(elementCount, ValueLayout.JAVA_BYTE).withName(name));
85         return this;
86     }
87     public static LayoutBuilder structBuilder(String name, Consumer<LayoutBuilder> consumer) {
88         return new LayoutBuilder().struct(name, consumer);
89     }
90     public static GroupLayout structOf(String name, Consumer<LayoutBuilder> consumer) {
91         return (GroupLayout) structBuilder(name, consumer).memoryLayout();
92     }
93 }