Java 类org.mockito.asm.ClassWriter 实例源码

public static byte[] makeMarkerInterface(String qualifiedName) {
    String relativePath = qualifiedName.replace('.', '/');

    ClassWriter cw = new ClassWriter(0);
    cw.visit(V1_6, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE, relativePath, null, "java/lang/Object", null);
    cw.visitEnd();

    return cw.toByteArray();
}

public byte[] generate(ClassGenerator cg) throws Exception {
    ClassWriter cw = getClassWriter();
    transform(cg).generateClass(cw);
    return transform(cw.toByteArray());
}

protected ClassWriter getClassWriter() throws Exception {
  return new DebuggingClassWriter(ClassWriter.COMPUTE_MAXS);
}

public byte[] generate(ClassGenerator cg) throws Exception {
    ClassWriter cw = getClassWriter();
    transform(cg).generateClass(cw);
    return transform(cw.toByteArray());
}

protected ClassWriter getClassWriter() throws Exception {
  return new DebuggingClassWriter(ClassWriter.COMPUTE_MAXS);
}

public byte[] generate(ClassGenerator cg) throws Exception {
    ClassWriter cw = getClassWriter();
    transform(cg).generateClass(cw);
    return transform(cw.toByteArray());
}

protected ClassWriter getClassWriter() throws Exception {
  return new DebuggingClassWriter(ClassWriter.COMPUTE_MAXS);
}

/**
 * create new {@link Component} type
 * @param name name of the class to create
 * @return created class
 */
   @SuppressWarnings("unchecked")
public Class<? extends Component> createComponentType(String name){

    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);

    String interfacePath = Component.class.getName().replaceAll("\\.", "/");

    // create public class (default package) implementing Component

    cw.visit(Opcodes.V1_6, // Java 1.6
            Opcodes.ACC_PUBLIC, // public class
            name, // package and name
            null, // signature (null means not generic)
            "java/lang/Object", // superclass
            new String[]{ interfacePath }); // interfaces

    // create public no-arg constructor

    MethodVisitor con = cw.visitMethod(
            Opcodes.ACC_PUBLIC,                 // public method
            "<init>",                           // method name 
            "()V",                              // descriptor
            null,                               // signature (null means not generic)
            null);                              // exceptions (array of strings)

    // define constructor body : call super constructor (java.lang.Object)

    con.visitCode();                            // Start the code for this method
    con.visitVarInsn(Opcodes.ALOAD, 0);         // Load "this" onto the stack
    con.visitMethodInsn(Opcodes.INVOKESPECIAL,  // Invoke an instance method (non-virtual)
            "java/lang/Object",                 // Class on which the method is defined
            "<init>",                           // Name of the method
            "()V");                             // Descriptor
    con.visitInsn(Opcodes.RETURN);              // End the constructor method
    con.visitMaxs(1, 1);                        // Specify max stack and local vars

    // close class definition.

    cw.visitEnd();

    // load and return class.
    byte[] b = cw.toByteArray();
    return (Class<? extends Component>)defineClass(name, b, 0, b.length);
   }