classutil.java

j2me 混淆包,用于混淆j2me的原代码用的

     *                                 e.g. "<code>mypackage/MyClass</code>".
     * @param accessFlags              the access flags of the method.
     * @param internalMethodName       the internal method name,
     *                                 e.g. "<code>myMethod</code>" or
     *                                      "<code>&lt;init&gt;</code>".
     * @param internalMethodDescriptor the internal method descriptor,
     *                                 e.g. "<code>(II)Z</code>".
     * @return the external full method description,
     *                                 e.g. "<code>public boolean myMethod(int,int)</code>" or
     *                                      "<code>public MyClass(int,int)</code>".
     */
    public static String externalFullMethodDescription(String internalClassName,
                                                       int    accessFlags,
                                                       String internalMethodName,
                                                       String internalMethodDescriptor)
    {
        return externalMethodAccessFlags(accessFlags) +
               externalMethodReturnTypeAndName(internalClassName,
                                               internalMethodName,
                                               internalMethodDescriptor) +
               ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN +
               externalMethodArguments(internalMethodDescriptor) +
               ClassConstants.EXTERNAL_METHOD_ARGUMENTS_CLOSE;
    }


    /**
     * Converts internal class access flags into an external access description.
     * @param accessFlags the class access flags.
     * @return the external class access description,
     *         e.g. "<code>public final </code>".
     */
    public static String externalClassAccessFlags(int accessFlags)
    {
        return externalClassAccessFlags(accessFlags, "");
    }


    /**
     * Converts internal class access flags into an external access description.
     * @param accessFlags the class access flags.
     * @param prefix      a prefix that is added to each access modifier.
     * @return the external class access description,
     *         e.g. "<code>public final </code>".
     */
    public static String externalClassAccessFlags(int accessFlags, String prefix)
    {
        if (accessFlags == 0)
        {
            return EMPTY_STRING;
        }

        StringBuffer string = new StringBuffer(50);

        if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PUBLIC).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_FINAL) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_FINAL).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_INTERFACE) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_INTERFACE).append(" ");
        }
        else
        {
            if ((accessFlags & ClassConstants.INTERNAL_ACC_ABSTRACT) != 0)
            {
                string.append(prefix).append(ClassConstants.EXTERNAL_ACC_ABSTRACT).append(" ");
            }
        }

        return string.toString();
    }


    /**
     * Converts internal field access flags into an external access description.
     * @param accessFlags the field access flags.
     * @return the external field access description,
     *         e.g. "<code>public volatile </code>".
     */
    public static String externalFieldAccessFlags(int accessFlags)
    {
        return externalFieldAccessFlags(accessFlags, "");
    }


    /**
     * Converts internal field access flags into an external access description.
     * @param accessFlags the field access flags.
     * @param prefix      a prefix that is added to each access modifier.
     * @return the external field access description,
     *         e.g. "<code>public volatile </code>".
     */
    public static String externalFieldAccessFlags(int accessFlags, String prefix)
    {
        if (accessFlags == 0)
        {
            return EMPTY_STRING;
        }

        StringBuffer string = new StringBuffer(50);

        if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PUBLIC).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_PRIVATE) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PRIVATE).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_PROTECTED) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PROTECTED).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_STATIC) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_STATIC).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_FINAL) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_FINAL).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_VOLATILE) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_VOLATILE).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_TRANSIENT) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_TRANSIENT).append(" ");
        }

        return string.toString();
    }


    /**
     * Converts internal method access flags into an external access description.
     * @param accessFlags the method access flags.
     * @return the external method access description,
     *                    e.g. "<code>public synchronized </code>".
     */
    public static String externalMethodAccessFlags(int accessFlags)
    {
        return externalMethodAccessFlags(accessFlags, "");
    }


    /**
     * Converts internal method access flags into an external access description.
     * @param accessFlags the method access flags.
     * @param prefix      a prefix that is added to each access modifier.
     * @return the external method access description,
     *                    e.g. "public synchronized ".
     */
    public static String externalMethodAccessFlags(int accessFlags, String prefix)
    {
        if (accessFlags == 0)
        {
            return EMPTY_STRING;
        }

        StringBuffer string = new StringBuffer(50);

        if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PUBLIC).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_PRIVATE) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PRIVATE).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_PROTECTED) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_PROTECTED).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_STATIC) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_STATIC).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_FINAL) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_FINAL).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_SYNCHRONIZED) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_SYNCHRONIZED).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_NATIVE) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_NATIVE).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_ABSTRACT) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_ABSTRACT).append(" ");
        }
        if ((accessFlags & ClassConstants.INTERNAL_ACC_STRICT) != 0)
        {
            string.append(prefix).append(ClassConstants.EXTERNAL_ACC_STRICT).append(" ");
        }

        return string.toString();
    }


    /**
     * Converts an internal method descriptor into an external method return type.
     * @param internalMethodDescriptor the internal method descriptor,
     *                                 e.g. "<code>(II)Z</code>".
     * @return the external method return type,
     *                                 e.g. "<code>boolean</code>".
     */
    public static String externalMethodReturnType(String internalMethodDescriptor)
    {
        return externalType(internalMethodReturnType(internalMethodDescriptor));
    }


    /**
     * Converts an internal class name, method name, and method descriptor to
     * an external method return type and name.
     * @param internalClassName        the internal name of the class of the method,
     *                                 e.g. "<code>mypackage/MyClass</code>".
     * @param internalMethodName       the internal method name,
     *                                 e.g. "<code>myMethod</code>" or
     *                                      "<code>&lt;init&gt;</code>".
     * @param internalMethodDescriptor the internal method descriptor,
     *                                 e.g. "<code>(II)Z</code>".
     * @return the external method return type and name,
     *                                 e.g. "<code>boolean myMethod</code>" or
     *                                      "<code>MyClass</code>".
     */
    private static String externalMethodReturnTypeAndName(String internalClassName,
                                                          String internalMethodName,
                                                          String internalMethodDescriptor)
    {
        return internalMethodName.equals(ClassConstants.INTERNAL_METHOD_NAME_INIT) ?
                    (ClassUtil.externalShortClassName(
                     ClassUtil.externalClassName(internalClassName))) :
                    (ClassUtil.externalMethodReturnType(internalMethodDescriptor) +
                     " " +
                     internalMethodName);
    }


    /**
     * Converts an internal method descriptor into an external method argument
     * description.
     * @param internalMethodDescriptor the internal method descriptor,
     *                                 e.g. "<code>(II)Z</code>".
     * @return the external method argument description,
     *                                 e.g. "<code>int,int</code>".
     */
    public static String externalMethodArguments(String internalMethodDescriptor)
    {
        StringBuffer externalMethodNameAndArguments = new StringBuffer();

        internalTypeEnumeration.setDescriptor(internalMethodDescriptor);
        while (internalTypeEnumeration.hasMoreTypes())
        {
            externalMethodNameAndArguments.append(externalType(internalTypeEnumeration.nextType()));
            if (internalTypeEnumeration.hasMoreTypes())
            {
                externalMethodNameAndArguments.append(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_SEPARATOR);
            }
        }

        return externalMethodNameAndArguments.toString();
    }


    /**
     * Returns the internal package name of the given internal class name.
     * @param internalClassName the internal class name,
     *                          e.g. "<code>java/lang/Object</code>".
     * @return the internal package name,
     *                          e.g. "<code>java/lang</code>".
     */
    public static String internalPackageName(String internalClassName)
    {
        int lastSeparatorIndex = internalClassName.lastIndexOf(ClassConstants.INTERNAL_PACKAGE_SEPARATOR);
        if (lastSeparatorIndex < 0)
        {
            lastSeparatorIndex = 0;
        }

        return internalClassName.substring(0, lastSeparatorIndex);
    }


    /**
     * Returns the external package name of the given external class name.
     * @param externalClassName the external class name,
     *                          e.g. "<code>java.lang.Object</code>".
     * @return the external package name,
     *                          e.g. "<code>java.lang</code>".
     */
    public static String externalPackageName(String externalClassName)
    {
        int lastSeparatorIndex = externalClassName.lastIndexOf(ClassConstants.EXTERNAL_PACKAGE_SEPARATOR);
        if (lastSeparatorIndex < 0)
        {
            lastSeparatorIndex = 0;
        }

        return externalClassName.substring(0, lastSeparatorIndex);
    }
}