1 #!/usr/bin/env java --enable-preview --source 24 
 2 /*
 3  * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.  Oracle designates this
 9  * particular file as subject to the "Classpath" exception as provided
10  * by Oracle in the LICENSE file that accompanied this code.
11  *
12  * This code is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15  * version 2 for more details (a copy is included in the LICENSE file that
16  * accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License version
19  * 2 along with this work; if not, write to the Free Software Foundation,
20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21  *
22  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
23  * or visit www.oracle.com if you need additional information or have any
24  * questions.
25  */
26 
27 import module java.compiler;
28 import com.sun.source.util.JavacTask;
29 import javax.tools.ToolProvider;
30 
31 void main(String[] args) throws IOException, InterruptedException {
32      var toolsDir = Path.of(System.getProperty("user.dir")).resolve("bldr");
33      var classesDir = toolsDir.resolve("classes");
34 
35      // Here we remove all classes from bldr/classes i.e rm -rf bldr/classes
36      if (Files.exists(classesDir)) {
37         Files.walk(classesDir).sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
38      }
39      // Now make sure the bldr/classes dir exists i.e mkdir -p bldr/classes
40      Files.createDirectories(classesDir);
41 
42      JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
43 
44      JavacTask javacTask = (JavacTask)javac.getTask(
45          null, null, null, 
46          List.of( "--source","24", "--enable-preview", "-d", classesDir.toString()),
47          null,
48          List.of(
49             new SimpleJavaFileObject(toolsDir.resolve("src/main/java/bldr/Bldr.java").toUri(),JavaFileObject.Kind.SOURCE){
50                public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
51                  return Files.readString(Path.of(toUri()));
52                }
53             }
54          )
55      );
56      javacTask.generate();
57 }
58