| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.kerby.asn1; |
| |
| /** |
| * Tag class defined by the spec. |
| */ |
| public enum TagClass { |
| UNKNOWN(-1), |
| UNIVERSAL(0x00), |
| APPLICATION(0x40), |
| CONTEXT_SPECIFIC(0x80), |
| PRIVATE(0xC0); |
| |
| private int value; |
| |
| /** |
| * The constructor given the value. |
| * @param value |
| */ |
| TagClass(int value) { |
| this.value = value; |
| } |
| |
| /** |
| * Get the tag class value. |
| * @return value |
| */ |
| public int getValue() { |
| return value; |
| } |
| |
| /** |
| * Tell it's universal or not. |
| * @return true if it's universal otherwise false |
| */ |
| public boolean isUniversal() { |
| return this == UNIVERSAL; |
| } |
| |
| public boolean isAppSpecific() { |
| return this == APPLICATION; |
| } |
| |
| public boolean isContextSpecific() { |
| return this == CONTEXT_SPECIFIC; |
| } |
| |
| public boolean isSpecific() { |
| return this == APPLICATION || this == CONTEXT_SPECIFIC; |
| } |
| |
| /** |
| * Converted from an integer |
| * @param value The int value of tag class |
| * @return tag class |
| */ |
| public static TagClass fromValue(int value) { |
| // Optimized by Emmanuel |
| switch (value) { |
| case 0x00: |
| return TagClass.UNIVERSAL; |
| case 0x40: |
| return TagClass.APPLICATION; |
| case 0x80: |
| return TagClass.CONTEXT_SPECIFIC; |
| case 0xC0: |
| return TagClass.PRIVATE; |
| default: |
| return TagClass.UNKNOWN; |
| } |
| } |
| |
| /** |
| * Converted from a tag value, which contains tag class info. |
| * @param tag The int value of tag class |
| * @return tag class |
| */ |
| public static TagClass fromTag(int tag) { |
| return fromValue(tag & 0xC0); |
| } |
| } |