Classworking工具箱: 注释（Annotation）与ASM - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-16
| ing</code> method to a class. */ public class ToStringGenerator extends ClassAdapter { private final ClassWriter m_writer; private final String m_internalName; private final FieldInfo[] m_fields; public ToStringGenerator(ClassWriter cw, String iname, FieldInfo[] props) { super(cw); m_writer = cw; m_internalName = iname; m_fields = props; } // called at end of class public void visitEnd() { // set up to build the toString() method MethodVisitor mv = m_writer.visitMethod(Opcodes.ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null); mv.visitCode(); // create and initialize StringBuffer instance mv.visitTypeInsn(Opcodes.NEW, "java/lang/StringBuffer"); mv.visitInsn(Opcodes.DUP); mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/StringBuffer", "<init>", "()V"); // start text with class name String name = m_internalName; int split = name.lastIndexOf(''/''); if (split >= 0) { name = name.substring(split+1); } mv.visitLdcInsn(name + ":"); mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;"); // loop through all field values to be included boolean newline = false; for (int i = 0; i < m_fields.length; i++) { // check type of field (objects other than Strings need conversion) FieldInfo prop = m_fields[i]; Type type = prop.getType(); boolean isobj = type.getSort() == Type.OBJECT && !type.getClassName().equals("java.lang.String"); // format lead text, with newline for object or after object String lead = (isobj || newline) ? "\n " : " "; if (prop.getText().length() > 0) { lead += prop.getText() + "="; } mv.visitLdcInsn(lead); mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;"); // load the actual field value and append mv.visitVarInsn(Opcodes.ALOAD, 0); mv.visitFieldInsn(Opcodes.GETFIELD, m_internalName, prop.getField(), type.getDescriptor()); if (isobj) { // convert objects by calling toString() method mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, |
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