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16 package org.outerj.daisy.query.model;
17
18 import java.util.Map  ;
19 import java.util.List ;
20 import java.util.ArrayList ;
21
22 public class ParamString {
23 private StringPart[] parts;
24
25 public ParamString(String string) {
26 List parts = new ArrayList ();
27 StringBuffer currentWord = new StringBuffer ();
28 final int IN_TEXT = 0;
29 final int IN_PARAM = 1;
30 int state = IN_TEXT;
31 for (int i = 0; i < string.length(); i++) {
32 char c = string.charAt(i);
33 switch (c) {
34 case '{':
35 if (state == IN_PARAM) {
36 if (currentWord.length() == 0) {
37 state = IN_TEXT;
38 currentWord.append("{");
39 } else {
40 throw new RuntimeException ("Error parsing pattern: nested '{'.");
41 }
42 } else {
43 if (currentWord.length() > 0) {
44 parts.add(new FixedStringPart(currentWord.toString()));
45 currentWord.setLength(0);
46 }
47 state = IN_PARAM;
48 }
49 break;
50 case '}':
51 if (state == IN_PARAM) {
52 if (currentWord.length() > 0) {
53 parts.add(new ParamStringPart(currentWord.toString()));
54 currentWord.setLength(0);
55 }
56 state = IN_TEXT;
57 } else {
58 currentWord.append("}");
59 }
60 break;
61 default:
62 currentWord.append(c);
63 }
64 }
65 if (currentWord.length() > 0)
66 parts.add(new FixedStringPart(currentWord.toString()));
67 this.parts = (StringPart[])parts.toArray(new StringPart[parts.size()]);
68 }
69
70 interface StringPart {
71 void append(StringBuffer buffer, Map params);
72 }
73
74 class FixedStringPart implements StringPart {
75 private final String string;
76
77 FixedStringPart(String string) {
78 this.string = string;
79 }
80
81 public void append(StringBuffer buffer, Map params) {
82 buffer.append(string);
83 }
84 }
85
86 class ParamStringPart implements StringPart {
87 private final String name;
88
89 ParamStringPart(String name) {
90 this.name = name;
91 }
92
93 public void append(StringBuffer buffer, Map params) {
94 String value = (String )params.get(name);
95 if (value != null)
96 buffer.append(value);
97 }
98 }
99
100 public String toString(Map params) {
101 StringBuffer result = new StringBuffer ();
102 this.append(result, params);
103 return result.toString();
104 }
105
106 public void append(StringBuffer buffer, Map params) {
107 for (int i = 0; i < parts.length; i++) {
108 parts[i].append(buffer, params);
109 }
110 }
111 }
112 |
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