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36 package org.columba.ristretto.io;
37
38 import java.io.File  ;
39 import java.io.IOException ;
40
41
47 public class FileSource implements Source {
48
49 private int start, end;
50 private int pos;
51
52 private FileSourceModel model;
53
54
55
61 public FileSource( File file ) throws IOException {
62 model = new FileSourceModel( file );
63 model.incReferences();
64 start = 0;
65 end = model.length();
66 pos = 0;
67 }
68
69 protected FileSource( FileSource parent ) {
70 this.model = parent.model;
71 this.model.incReferences();
72 this.start = parent.start;
73 this.end = parent.end;
74 this.pos = 0;
75 }
76
77
80 public Source fromActualPosition() {
81 FileSource subsource = new FileSource( this );
82 subsource.start = start + pos;
83
84 return subsource;
85 }
86
87
90 public int getPosition() {
91 return pos;
92 }
93
94
97 public void seek(int position) throws IOException {
98 pos = position;
99 }
100
101
104 public char next() throws IOException {
105 return model.get(start + pos++);
106 }
107
108
111 public int length() {
112 return end - start;
113 }
114
115
118 public char charAt(int arg0){
119 try {
120 return model.get(start + arg0);
121 } catch (IOException e) {
122 e.printStackTrace();
123 return 0;
124 }
125 }
126
127
130 public Source subSource(int arg0, int arg1) {
131 FileSource subsource = new FileSource( this );
132 subsource.start = start + arg0;
133 subsource.end = start + arg1;
134 return subsource;
135 }
136
137
140 public CharSequence subSequence(int arg0, int arg1) {
141 if( arg1 - arg0 < 1024) {
142 StringBuffer result = new StringBuffer ( arg1- arg0);
143 for( int i=arg0; i<arg1; i++ ) {
144 result.append(charAt(i));
145 }
146 return result;
147 } else {
148 return subSource( arg0, arg1);
149 }
150 }
151
152
155 public String toString() {
156 StringBuffer buffer = new StringBuffer (length());
157 for( int i=0; i < length(); i++) {
158 buffer.append(charAt(i));
159 }
160 return buffer.toString();
161 }
162
163
164
165
168 public boolean isEOF() {
169 return pos == end;
170 }
171
172
173
174
177 protected void finalize() throws Throwable {
178 super.finalize();
179 if( model != null ) {
180 model.decReferences();
181 model = null;
182 }
183 }
184
187 public void close() throws IOException {
188 if( model != null ) {
189 model.decReferences();
190 model = null;
191 }
192 }
193
194
197 public void deepClose() throws IOException {
198 if ( model != null)
199 model.close();
200 model = null;
201 }
202
203
208 public File getFile() {
209 return model.getFile();
210 }
211 }
212 |
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