001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.jci.classes;
019    
020    import org.objectweb.asm.ClassWriter;
021    import org.objectweb.asm.Label;
022    import org.objectweb.asm.MethodVisitor;
023    import org.objectweb.asm.Opcodes;
024    
025    public class SimpleDump implements Opcodes {
026    
027        public static byte[] dump( final String to ) throws Exception {
028    
029            ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
030            MethodVisitor mv;
031    
032            cw.visit(V1_4, ACC_PUBLIC + ACC_SUPER, "jci/Simple", null, "java/lang/Object", null);
033    
034            cw.visitSource("Simple.java", null);
035    
036            {
037                mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
038                mv.visitCode();
039                Label l0 = new Label();
040                mv.visitLabel(l0);
041                mv.visitLineNumber(3, l0);
042                mv.visitVarInsn(ALOAD, 0);
043                mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
044                mv.visitInsn(RETURN);
045                Label l1 = new Label();
046                mv.visitLabel(l1);
047                mv.visitLocalVariable("this", "Ljci/Simple;", null, l0, l1, 0);
048                mv.visitMaxs(1, 1);
049                mv.visitEnd();
050            }
051            {
052                mv = cw.visitMethod(ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
053                mv.visitCode();
054                Label l0 = new Label();
055                mv.visitLabel(l0);
056                mv.visitLineNumber(6, l0);
057                mv.visitLdcInsn(to);
058                mv.visitInsn(ARETURN);
059                Label l1 = new Label();
060                mv.visitLabel(l1);
061                mv.visitLocalVariable("this", "Ljci/Simple;", null, l0, l1, 0);
062                mv.visitMaxs(1, 1);
063                mv.visitEnd();
064            }
065            cw.visitEnd();
066    
067            return cw.toByteArray();
068        }
069    }