|
1
36 package org.columba.ristretto.io;
37
38 import java.io.IOException  ;
39
40
46 public class ByteBufferSource implements Source {
47
48 private byte[] source;
49
50 private int start,end;
51 private int pos;
52
53
58 public ByteBufferSource( byte[] source ) {
59 this.source = source;
60
61 pos = 0;
62 start = 0;
63 end = source.length;
64 }
65
66
69 public Source fromActualPosition() {
70 ByteBufferSource subsource = new ByteBufferSource(source);
71 subsource.start = this.start + pos;
72 subsource.end = end;
73 subsource.pos = 0;
74 return subsource;
75 }
76
77
80 public int getPosition() {
81 return pos;
82 }
83
84
87 public void seek(int position) throws IOException {
88 pos = position;
89 }
90
91
94 public char next() throws IOException {
95 byte value = source[ start + (pos++) ];
98 int trueValue = (value & 0x080) + (value & 0x07F);
99
100 return (char) trueValue;
101 }
102
103
106 public boolean isEOF() {
107 return pos == end;
108 }
109
110
113 public int length() {
114 return end - start;
115 }
116
117
120 public char charAt(int pos) {
121 try {
122 seek(pos);
123 return next();
124 } catch (IOException e) {
125 e.printStackTrace();
126 return 0;
127 }
128 }
129
130
133 public Source subSource( int start, int end ) {
134 ByteBufferSource subsource = new ByteBufferSource(source);
135 subsource.start = this.start + start;
136 subsource.end = this.start + end;
137 subsource.pos = 0;
138 return subsource;
139 }
140
141
144 public CharSequence subSequence(int start, int end) {
145 return subSource( start, end);
146 }
147
148
151 public String toString() {
152 StringBuffer buffer = new StringBuffer (length());
153 for( int i=0; i < length(); i++) {
154 buffer.append(charAt(i));
155 }
156 return buffer.toString();
157 }
158
159
162 public void close() throws IOException {
163 source = null;
164 }
165
166
169 public void deepClose() throws IOException {
170 close();
171 }
172 }
173 |
Popular Tags |
Java API By Example, From Geeks To Geeks.