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1
43 package net.jforum.util.preferences;
44
45 import java.util.HashMap  ;
46 import java.util.Map ;
47
48
53 public class VariableExpander
54 {
55 private VariableStore variables;
56
57 private String pre;
58 private String post;
59
60 private Map cache;
61
62 public VariableExpander(VariableStore variables, String pre, String post)
63 {
64 this.variables = variables;
65 this.pre = pre;
66 this.post = post;
67 cache = new HashMap ();
68 }
69
70 public void clearCache()
71 {
72 cache.clear();
73 }
74
75 public String expandVariables(String source)
76 {
77 String result = (String )this.cache.get(source);
78
79 if (source == null || result != null) {
80 return result;
81 }
82
83 int fIndex = source.indexOf(this.pre);
84
85 if (fIndex == -1) {
86 return source;
87 }
88
89 StringBuffer sb = new StringBuffer (source);
90
91 while (fIndex > -1) {
92 int lIndex = sb.indexOf(this.post);
93
94 int start = fIndex + this.pre.length();
95
96 if (fIndex == 0) {
97 String varName = sb.substring(start, start + lIndex - this.pre.length());
98 sb.replace(fIndex, fIndex + lIndex + 1, this.variables.getVariableValue(varName));
99 }
100 else {
101 String varName = sb.substring(start, lIndex);
102 sb.replace(fIndex, lIndex + 1, this.variables.getVariableValue(varName));
103 }
104
105 fIndex = sb.indexOf(this.pre);
106 }
107
108 result = sb.toString();
109
110 this.cache.put(source, result);
111
112 return result;
113 }
114 }
115 |
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