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1
23 package org.archive.io;
24
25
26
32 public class CharSubSequence implements CharSequence  {
33
34 CharSequence inner;
35 int start;
36 int end;
37
38 public CharSubSequence(CharSequence inner, int start, int end) {
39 if (end < start) {
40 throw new IllegalArgumentException ("Start " + start + " is > " +
41 " than end " + end);
42 }
43
44 if (end < 0 || start < 0) {
45 throw new IllegalArgumentException ("Start " + start + " or end " +
46 end + " is < 0.");
47 }
48
49 if (inner == null) {
50 throw new NullPointerException ("Passed charsequence is null.");
51 }
52
53 this.inner = inner;
54 this.start = start;
55 this.end = end;
56 }
57
58
62 public int length() {
63 return this.end - this.start;
64 }
65
66
70 public char charAt(int index) {
71 return this.inner.charAt(this.start + index);
72 }
73
74
78 public CharSequence subSequence(int begin, int finish) {
79 return new CharSubSequence(this, begin, finish);
80 }
81
82
86 public String toString() {
87 StringBuffer sb = new StringBuffer (length());
88 for (int i = 0;i<length();i++) {
90 sb.append(charAt(i));
91 }
92 return sb.toString();
93 }
94 }
95 |
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