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comparison src/com/tmate/hgkit/fs/DataAccess.java @ 51:9429c7bd1920 wrap-data-access

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Try DataAccess to reach revision data instead of plain byte arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:20:26 +0100
parents 382cfe9463db
children
comparison
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50:f1db8610da62 51:9429c7bd1920
7 7
8 /** 8 /**
9 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data. 9 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
10 * convenient skip (+/- bytes) 10 * convenient skip (+/- bytes)
11 * Primary goal - effective file read, so that clients don't need to care whether to call few 11 * Primary goal - effective file read, so that clients don't need to care whether to call few
12 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize. 12 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.
13 * Name: ByteSource? DataSource, DataInput, ByteInput
13 */ 14 */
14 public class DataAccess { 15 public class DataAccess {
15 public boolean isEmpty() { 16 public boolean isEmpty() {
16 return true; 17 return true;
18 }
19 public long length() {
20 return 0;
21 }
22 // get this instance into initial state
23 public void reset() throws IOException {
24 // nop, empty instance is always in the initial state
17 } 25 }
18 // absolute positioning 26 // absolute positioning
19 public void seek(long offset) throws IOException { 27 public void seek(long offset) throws IOException {
20 throw new UnsupportedOperationException(); 28 throw new UnsupportedOperationException();
21 } 29 }
43 throw new UnsupportedOperationException(); 51 throw new UnsupportedOperationException();
44 } 52 }
45 public byte readByte() throws IOException { 53 public byte readByte() throws IOException {
46 throw new UnsupportedOperationException(); 54 throw new UnsupportedOperationException();
47 } 55 }
56
57 // XXX decide whether may or may not change position in the DataAccess
58 // FIXME exception handling is not right, just for the sake of quick test
59 public byte[] byteArray() {
60 byte[] rv = new byte[(int) length()];
61 try {
62 reset();
63 readBytes(rv, 0, rv.length);
64 } catch (IOException ex) {
65 ex.printStackTrace();
66 }
67 return rv;
68 }
48 } 69 }