1 /*
 2  * Copyright (c) 2017, 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.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 package jdk.experimental.bytecode;
25 
26 /**
27  * Base builder.
28  *
29  * @param <S> the type of the symbol representation
30  * @param <T> the type of type descriptors representation
31  * @param <E> the type of pool entries
32  * @param <D> the type of this builder
33  */
34 public class AbstractBuilder<S, T, E, D extends AbstractBuilder<S, T, E, D>> {
35     /**
36      * The helper to build the constant pool.
37      */
38     protected final PoolHelper<S, T, E> poolHelper;
39 
40     /**
41      * The helper to use to manipulate type descriptors.
42      */
43     protected final TypeHelper<S, T> typeHelper;
44 
45     /**
46      * Create a builder.
47      *
48      * @param poolHelper the helper to build the constant pool
49      * @param typeHelper the helper to use to manipulate type descriptors
50      */
51     AbstractBuilder(PoolHelper<S, T, E> poolHelper, TypeHelper<S, T> typeHelper) {
52         this.poolHelper = poolHelper;
53         this.typeHelper = typeHelper;
54     }
55 
56     @SuppressWarnings("unchecked")
57     D thisBuilder() {
58         return (D) this;
59     }
60 }