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1 package org.objectweb.celtix.tools.common.toolspec.parser;
2
3 import java.util.logging.Level  ;
4 import java.util.logging.Logger ;
5
6 import org.objectweb.celtix.common.logging.LogUtils;
7
8 public class TokenInputStream {
9
10 private static final Logger LOG = LogUtils.getL7dLogger(TokenInputStream.class);
11 private final String [] tokens;
12 private int pos;
13
14 public TokenInputStream(String [] t) {
15 this.tokens = t;
16 }
17
18 public String read() {
19 if (LOG.isLoggable(Level.INFO)) {
20 LOG.info("Reading token " + tokens[pos]);
21 }
22 return tokens[pos++];
23 }
24
25 public String readNext() {
26 return read(pos++);
27 }
28
29 public String read(int position) {
30 if (position < 0) {
31 pos = 0;
32 }
33 if (position > tokens.length) {
34 pos = tokens.length - 1;
35 }
36 return tokens[pos];
37 }
38
39 public String readPre() {
40 if (pos != 0) {
41 pos--;
42 }
43 return tokens[pos];
44 }
45
46 public String peek() {
47 if (LOG.isLoggable(Level.INFO)) {
48 LOG.info("Peeking token " + tokens[pos]);
49 }
50 return tokens[pos];
51 }
52
53 public String peekPre() {
54 if (pos == 0) {
55 return tokens[pos];
56 }
57 return tokens[pos - 1];
58 }
59
60 public String peek(int position) {
61 if (position < 0) {
62 return tokens[0];
63 }
64 if (position > tokens.length) {
65 return tokens[tokens.length - 1];
66 }
67 return tokens[position];
68 }
69
70 public int getPosition() {
71 return pos;
72 }
73
74 public void setPosition(int p) {
75 this.pos = p;
76 }
77
78 public int available() {
79 return tokens.length - pos;
80 }
81
82 public boolean hasNext() {
83 return available() > 1;
84 }
85
86 public boolean isOutOfBound() {
87 return pos >= tokens.length;
88 }
89
90 public String toString() {
91 StringBuffer sb = new StringBuffer ("[ ");
92
93 for (int i = pos; i < tokens.length; i++) {
94 sb.append(tokens[i]);
95 if (i < tokens.length - 1) {
96 sb.append(" ");
97 }
98 }
99 sb.append(" ]");
100 return sb.toString();
101 }
102
103 }
104 |
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Java API By Example, From Geeks To Geeks.