1 /*
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 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 5  * This code is free software; you can redistribute it and/or modify it
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 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.
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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).
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24  */
25 package jdk.incubator.code.extern;
26 
27 import jdk.incubator.code.CodeType;
28 
29 /**
30  * A code type factory for construction a {@link CodeType} from its
31  * {@link ExternalizedCodeType external content}.
32  */
33 @FunctionalInterface
34 public interface CodeTypeFactory {
35 
36     /**
37      * Constructs a {@link CodeType} from its
38      * {@link ExternalizedCodeType external content}.
39      * <p>
40      * If there is no mapping from the external content to a code type
41      * then this method returns {@code null}.
42      *
43      * @param tree the externalized code type.
44      * @return the code type.
45      */
46     CodeType constructType(ExternalizedCodeType tree);
47 
48     /**
49      * Compose this code type factory with another code type factory.
50      * <p>
51      * If there is no mapping in this code type factory then the result
52      * of the other code type factory is returned.
53      *
54      * @param after the other code type factory.
55      * @return the composed code type factory.
56      */
57     default CodeTypeFactory andThen(CodeTypeFactory after) {
58         return t -> {
59             CodeType te = constructType(t);
60             return te != null ? te : after.constructType(t);
61         };
62     }
63 }