Mercurial > hg > Members > sugi > MessagePack-java

comparison src/main/java/org/msgpack/unpacker/UnpackerStack.java @ 0:cb825acd883a

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author sugi
date Sat, 18 Oct 2014 15:06:15 +0900
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-1:000000000000 0:cb825acd883a
1 //
2 // MessagePack for Java
3 //
4 // Copyright (C) 2009 - 2013 FURUHASHI Sadayuki
5 //
6 // Licensed under the Apache License, Version 2.0 (the "License");
7 // you may not use this file except in compliance with the License.
8 // You may obtain a copy of the License at
9 //
10 // http://www.apache.org/licenses/LICENSE-2.0
11 //
12 // Unless required by applicable law or agreed to in writing, software
13 // distributed under the License is distributed on an "AS IS" BASIS,
14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 // See the License for the specific language governing permissions and
16 // limitations under the License.
17 //
18 package org.msgpack.unpacker;
19
20 import org.msgpack.MessageTypeException;
21
22 public final class UnpackerStack {
23 private int top;
24 private byte[] types;
25 private int[] counts;
26
27 public static final int MAX_STACK_SIZE = 128;
28
29 private static final byte TYPE_INVALID = 0;
30 private static final byte TYPE_ARRAY = 1;
31 private static final byte TYPE_MAP = 2;
32
33 public UnpackerStack() {
34 this.top = 0;
35 this.types = new byte[MAX_STACK_SIZE];
36 this.counts = new int[MAX_STACK_SIZE];
37 this.types[0] = TYPE_INVALID;
38 }
39
40 public void pushArray(int size) {
41 top++;
42 types[top] = TYPE_ARRAY;
43 counts[top] = size;
44 }
45
46 public void pushMap(int size) {
47 top++;
48 types[top] = TYPE_MAP;
49 counts[top] = size * 2;
50 }
51
52 /**
53 * throws MessageTypeException if stack is invalid
54 */
55 public void checkCount() {
56 if (counts[top] > 0) {
57 return;
58 }
59
60 if (types[top] == TYPE_ARRAY) {
61 throw new MessageTypeException(
62 "Array is end but readArrayEnd() is not called");
63 } else if (types[top] == TYPE_MAP) {
64 throw new MessageTypeException(
65 "Map is end but readMapEnd() is not called");
66 } else { // empty
67 return;
68 }
69 }
70
71 public void reduceCount() {
72 counts[top]--;
73 }
74
75 public void pop() {
76 top--;
77 }
78
79 public int getDepth() {
80 return top;
81 }
82
83 public int getTopCount() {
84 return counts[top];
85 }
86
87 public boolean topIsArray() {
88 return types[top] == TYPE_ARRAY;
89 }
90
91 public boolean topIsMap() {
92 return types[top] == TYPE_MAP;
93 }
94
95 public void clear() {
96 top = 0;
97 }
98 }