1 package net.sourceforge.jenesis4java.example;
2
3 /*
4 * #%L
5 * Jenesis 4 Java Code Generator
6 * %%
7 * Copyright (C) 2000 - 2015 jenesis4java
8 * %%
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Lesser Public License for more details.
18 *
19 * You should have received a copy of the GNU General Lesser Public
20 * License along with this program. If not, see
21 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
22 * #L%
23 */
24
25 /**
26 * Copyright (C) 2008 Richard van Nieuwenhoven - ritchie [at] gmx [dot] at
27 * Copyright (C) 2000, 2001 Paul Cody Johnston - pcj@inxar.org This program is
28 * free software; you can redistribute it and/or modify it under the terms of
29 * the GNU Lesser General Public License as published by the Free Software
30 * Foundation; either version 2 of the License, or (at your option) any later
31 * version. This program is distributed in the hope that it will be useful, but
32 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
33 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
34 * for more details. You should have received a copy of the GNU Lesser General
35 * Public License along with this program; if not, write to the Free Software
36 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 */
38 import net.sourceforge.jenesis4java.Access;
39 import net.sourceforge.jenesis4java.Binary;
40 import net.sourceforge.jenesis4java.ClassMethod;
41 import net.sourceforge.jenesis4java.Comment;
42 import net.sourceforge.jenesis4java.CompilationUnit;
43 import net.sourceforge.jenesis4java.Invoke;
44 import net.sourceforge.jenesis4java.Let;
45 import net.sourceforge.jenesis4java.PackageClass;
46 import net.sourceforge.jenesis4java.Type;
47 import net.sourceforge.jenesis4java.VirtualMachine;
48
49 /**
50 * Example which generates a class which prints "Hello World!" to standard
51 * output.
52 */
53 class HelloWorldAndi {
54
55 public static void main(String[] argv) throws Exception {
56 // Get the VirtualMachine implementation.
57 VirtualMachine vm = VirtualMachine.getVirtualMachine();
58
59 // Instantiate a new CompilationUnit. The argument to the
60 // compilation unit is the "codebase" or directory where the
61 // compilation unit should be written.
62 //
63 // Make a new compilation unit rooted to the given sourcepath.
64 CompilationUnit unit = vm.newCompilationUnit("/tmp");
65
66 // Set the package namespace.
67 unit.setNamespace("com.example.jenesis");
68
69 // Add an import statement for fun.
70 unit.addImport("java.io.Serializable");
71
72 // Comment the package with a javadoc (DocumentationComment).
73 unit.setComment(Comment.DOCUMENTATION, "Auto-Generated using the Jenesis Syntax API");
74
75 // Make a new class.
76 PackageClass cls = unit.newClass("HelloWorldAndi");
77 // Make it a public class.
78 cls.setAccess(Access.PUBLIC);
79 // Extend Object just for fun.
80 cls.setExtends("Object");
81 // Implement serializable just for fun.
82 cls.addImplements("Serializable");
83 // Comment the class with a javadoc (DocumentationComment).
84 unit.setComment(Comment.DOCUMENTATION, "The HelloWorld example class :)");
85
86 // Make a new Method in the Class having type VOID and name "main".
87 ClassMethod method = cls.newMethod(vm.newType(Type.VOID), "main");
88 // Make it a public method.
89 method.setAccess(Access.PUBLIC);
90 // Make it a static method
91 method.isStatic(true);
92 // Add the "String[] argv" formal parameter.
93 method.addParameter(vm.newArray("String", 1), "argv");
94
95 // Create a new Method Invocation expression.
96 Invoke println = vm.newInvoke("System.out", "println");
97 // Add the Hello World string literal as the sole argument.
98 println.addArg(vm.newString("Hello World!"));
99 // Add this expression to the method in a statement.
100 method.newStmt(println);
101
102 ClassMethod method2 = cls.newMethod(vm.newType(Type.INT), "test");
103
104 method2.setAccess(Access.PRIVATE);
105 ClassMethod method3 = cls.newMethod(vm.newType("String"), "set" + capitalize("name"));
106 method3.setAccess(Access.PUBLIC);
107 method3.addParameter(vm.newType("int"), "input");
108 Let letx = method3.newLet(vm.newType(Type.LONG));
109 letx.addAssign("x", vm.newBinary(Binary.ADD, vm.newVar("input"), vm.newLong(12L)));
110 method3.newReturn().setExpression(vm.newVar("x"));
111 // Encode the file, compile it, and load the class
112 System.out.println(cls);
113
114 // java.lang.Class hello = cls.load();
115
116 // Get the main method
117 // java.lang.reflect.Method main = hello.getMethod("main", new Class[] {
118 // String[].class });
119
120 // Invoke it
121 // main.invoke(hello.newInstance(), new Object[] { new String[] {} });
122 }
123
124 private static String capitalize(String s) {
125 char[] chars = s.toCharArray();
126 chars[0] = Character.toUpperCase(chars[0]);
127 return new String(chars);
128 }
129 }