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1 //
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2 // MessagePack for Java
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3 //
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4 // Copyright (C) 2009 - 2013 FURUHASHI Sadayuki
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5 //
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6 // Licensed under the Apache License, Version 2.0 (the "License");
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7 // you may not use this file except in compliance with the License.
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8 // You may obtain a copy of the License at
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9 //
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 //
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 package org.msgpack.unpacker;
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19
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20 import org.msgpack.MessageTypeException;
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21
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22 public final class UnpackerStack {
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23 private int top;
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24 private byte[] types;
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25 private int[] counts;
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26
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27 public static final int MAX_STACK_SIZE = 128;
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28
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29 private static final byte TYPE_INVALID = 0;
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30 private static final byte TYPE_ARRAY = 1;
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31 private static final byte TYPE_MAP = 2;
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32
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33 public UnpackerStack() {
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34 this.top = 0;
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35 this.types = new byte[MAX_STACK_SIZE];
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36 this.counts = new int[MAX_STACK_SIZE];
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37 this.types[0] = TYPE_INVALID;
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38 }
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39
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40 public void pushArray(int size) {
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41 top++;
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42 types[top] = TYPE_ARRAY;
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43 counts[top] = size;
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44 }
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45
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46 public void pushMap(int size) {
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47 top++;
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48 types[top] = TYPE_MAP;
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49 counts[top] = size * 2;
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50 }
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51
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52 /**
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53 * throws MessageTypeException if stack is invalid
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54 */
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55 public void checkCount() {
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56 if (counts[top] > 0) {
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57 return;
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58 }
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59
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60 if (types[top] == TYPE_ARRAY) {
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61 throw new MessageTypeException(
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62 "Array is end but readArrayEnd() is not called");
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63 } else if (types[top] == TYPE_MAP) {
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64 throw new MessageTypeException(
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65 "Map is end but readMapEnd() is not called");
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66 } else { // empty
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67 return;
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68 }
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69 }
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70
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71 public void reduceCount() {
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72 counts[top]--;
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73 }
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74
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75 public void pop() {
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76 top--;
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77 }
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78
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79 public int getDepth() {
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80 return top;
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81 }
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82
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83 public int getTopCount() {
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84 return counts[top];
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85 }
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86
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87 public boolean topIsArray() {
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88 return types[top] == TYPE_ARRAY;
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89 }
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90
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91 public boolean topIsMap() {
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92 return types[top] == TYPE_MAP;
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93 }
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94
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95 public void clear() {
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96 top = 0;
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97 }
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98 }
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