methodvisitor.java

jboss规则引擎

                        String owner,
                        String name,
                        String desc);

    /**
     * Visits a method instruction. A method instruction is an instruction that
     * invokes a method.
     * 
     * @param opcode the opcode of the type instruction to be visited. This
     *        opcode is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or
     *        INVOKEINTERFACE.
     * @param owner the internal name of the method's owner class (see {@link
     *        Type#getInternalName() getInternalName}).
     * @param name the method's name.
     * @param desc the method's descriptor (see {@link Type Type}).
     */
    void visitMethodInsn(int opcode,
                         String owner,
                         String name,
                         String desc);

    /**
     * Visits a jump instruction. A jump instruction is an instruction that may
     * jump to another instruction.
     * 
     * @param opcode the opcode of the type instruction to be visited. This
     *        opcode is either IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ,
     *        IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ,
     *        IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
     * @param label the operand of the instruction to be visited. This operand
     *        is a label that designates the instruction to which the jump
     *        instruction may jump.
     */
    void visitJumpInsn(int opcode,
                       Label label);

    /**
     * Visits a label. A label designates the instruction that will be visited
     * just after it.
     * 
     * @param label a {@link Label Label} object.
     */
    void visitLabel(Label label);

    // -------------------------------------------------------------------------
    // Special instructions
    // -------------------------------------------------------------------------

    /**
     * Visits a LDC instruction.
     * 
     * @param cst the constant to be loaded on the stack. This parameter must be
     *        a non null {@link Integer}, a {@link Float}, a {@link Long}, a
     *        {@link Double} a {@link String} (or a {@link Type} for
     *        <tt>.class</tt> constants, for classes whose version is 49.0 or
     *        more).
     */
    void visitLdcInsn(Object cst);

    /**
     * Visits an IINC instruction.
     * 
     * @param var index of the local variable to be incremented.
     * @param increment amount to increment the local variable by.
     */
    void visitIincInsn(int var,
                       int increment);

    /**
     * Visits a TABLESWITCH instruction.
     * 
     * @param min the minimum key value.
     * @param max the maximum key value.
     * @param dflt beginning of the default handler block.
     * @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is
     *        the beginning of the handler block for the <tt>min + i</tt> key.
     */
    void visitTableSwitchInsn(int min,
                              int max,
                              Label dflt,
                              Label labels[]);

    /**
     * Visits a LOOKUPSWITCH instruction.
     * 
     * @param dflt beginning of the default handler block.
     * @param keys the values of the keys.
     * @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is
     *        the beginning of the handler block for the <tt>keys[i]</tt> key.
     */
    void visitLookupSwitchInsn(Label dflt,
                               int keys[],
                               Label labels[]);

    /**
     * Visits a MULTIANEWARRAY instruction.
     * 
     * @param desc an array type descriptor (see {@link Type Type}).
     * @param dims number of dimensions of the array to allocate.
     */
    void visitMultiANewArrayInsn(String desc,
                                 int dims);

    // -------------------------------------------------------------------------
    // Exceptions table entries, debug information,
    // max stack size and max locals
    // -------------------------------------------------------------------------

    /**
     * Visits a try catch block.
     * 
     * @param start beginning of the exception handler's scope (inclusive).
     * @param end end of the exception handler's scope (exclusive).
     * @param handler beginning of the exception handler's code.
     * @param type internal name of the type of exceptions handled by the
     *        handler, or <tt>null</tt> to catch any exceptions (for "finally"
     *        blocks).
     */
    void visitTryCatchBlock(Label start,
                            Label end,
                            Label handler,
                            String type);

    /**
     * Visits a local variable declaration.
     * 
     * @param name the name of a local variable.
     * @param desc the type descriptor of this local variable.
     * @param signature the type signature of this local variable. May be
     *        <tt>null</tt> if the local variable type does not use generic
     *        types.
     * @param start the first instruction corresponding to the scope of this
     *        local variable (inclusive).
     * @param end the last instruction corresponding to the scope of this local
     *        variable (exclusive).
     * @param index the local variable's index.
     * @throws IllegalArgumentException if one of the labels has not already
     *         been visited by this visitor (by the
     *         {@link #visitLabel visitLabel} method).
     */
    void visitLocalVariable(String name,
                            String desc,
                            String signature,
                            Label start,
                            Label end,
                            int index);

    /**
     * Visits a line number declaration.
     * 
     * @param line a line number. This number refers to the source file from
     *        which the class was compiled.
     * @param start the first instruction corresponding to this line number.
     * @throws IllegalArgumentException if <tt>start</tt> has not already been
     *         visited by this visitor (by the {@link #visitLabel visitLabel}
     *         method).
     */
    void visitLineNumber(int line,
                         Label start);

    /**
     * Visits the maximum stack size and the maximum number of local variables
     * of the method.
     * 
     * @param maxStack maximum stack size of the method.
     * @param maxLocals maximum number of local variables for the method.
     */
    void visitMaxs(int maxStack,
                   int maxLocals);

    /**
     * Visits the end of the method. This method, which is the last one to be
     * called, is used to inform the visitor that all the annotations and
     * attributes of the method have been visited.
     */
    void visitEnd();
}