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1
11 package org.eclipse.jdt.internal.core.util;
12
13 import org.eclipse.jdt.internal.core.JavaElement;
14
15 public class MementoTokenizer {
16 private static final String  COUNT = Character.toString(JavaElement.JEM_COUNT);
17 private static final String JAVAPROJECT = Character.toString(JavaElement.JEM_JAVAPROJECT);
18 private static final String PACKAGEFRAGMENTROOT = Character.toString(JavaElement.JEM_PACKAGEFRAGMENTROOT);
19 private static final String PACKAGEFRAGMENT = Character.toString(JavaElement.JEM_PACKAGEFRAGMENT);
20 private static final String FIELD = Character.toString(JavaElement.JEM_FIELD);
21 private static final String METHOD = Character.toString(JavaElement.JEM_METHOD);
22 private static final String INITIALIZER = Character.toString(JavaElement.JEM_INITIALIZER);
23 private static final String COMPILATIONUNIT = Character.toString(JavaElement.JEM_COMPILATIONUNIT);
24 private static final String CLASSFILE = Character.toString(JavaElement.JEM_CLASSFILE);
25 private static final String TYPE = Character.toString(JavaElement.JEM_TYPE);
26 private static final String PACKAGEDECLARATION = Character.toString(JavaElement.JEM_PACKAGEDECLARATION);
27 private static final String IMPORTDECLARATION = Character.toString(JavaElement.JEM_IMPORTDECLARATION);
28 private static final String LOCALVARIABLE = Character.toString(JavaElement.JEM_LOCALVARIABLE);
29 private static final String TYPE_PARAMETER = Character.toString(JavaElement.JEM_TYPE_PARAMETER);
30
31 private final char[] memento;
32 private final int length;
33 private int index = 0;
34
35 public MementoTokenizer(String memento) {
36 this.memento = memento.toCharArray();
37 this.length = this.memento.length;
38 }
39
40 public boolean hasMoreTokens() {
41 return this.index < this.length;
42 }
43
44 public String nextToken() {
45 int start = this.index;
46 StringBuffer buffer = null;
47 switch (this.memento[this.index++]) {
48 case JavaElement.JEM_ESCAPE:
49 buffer = new StringBuffer ();
50 buffer.append(this.memento[this.index]);
51 start = ++this.index;
52 break;
53 case JavaElement.JEM_COUNT:
54 return COUNT;
55 case JavaElement.JEM_JAVAPROJECT:
56 return JAVAPROJECT;
57 case JavaElement.JEM_PACKAGEFRAGMENTROOT:
58 return PACKAGEFRAGMENTROOT;
59 case JavaElement.JEM_PACKAGEFRAGMENT:
60 return PACKAGEFRAGMENT;
61 case JavaElement.JEM_FIELD:
62 return FIELD;
63 case JavaElement.JEM_METHOD:
64 return METHOD;
65 case JavaElement.JEM_INITIALIZER:
66 return INITIALIZER;
67 case JavaElement.JEM_COMPILATIONUNIT:
68 return COMPILATIONUNIT;
69 case JavaElement.JEM_CLASSFILE:
70 return CLASSFILE;
71 case JavaElement.JEM_TYPE:
72 return TYPE;
73 case JavaElement.JEM_PACKAGEDECLARATION:
74 return PACKAGEDECLARATION;
75 case JavaElement.JEM_IMPORTDECLARATION:
76 return IMPORTDECLARATION;
77 case JavaElement.JEM_LOCALVARIABLE:
78 return LOCALVARIABLE;
79 case JavaElement.JEM_TYPE_PARAMETER:
80 return TYPE_PARAMETER;
81 }
82 loop: while (this.index < this.length) {
83 switch (this.memento[this.index]) {
84 case JavaElement.JEM_ESCAPE:
85 if (buffer == null) buffer = new StringBuffer ();
86 buffer.append(this.memento, start, this.index - start);
87 start = ++this.index;
88 break;
89 case JavaElement.JEM_COUNT:
90 case JavaElement.JEM_JAVAPROJECT:
91 case JavaElement.JEM_PACKAGEFRAGMENTROOT:
92 case JavaElement.JEM_PACKAGEFRAGMENT:
93 case JavaElement.JEM_FIELD:
94 case JavaElement.JEM_METHOD:
95 case JavaElement.JEM_INITIALIZER:
96 case JavaElement.JEM_COMPILATIONUNIT:
97 case JavaElement.JEM_CLASSFILE:
98 case JavaElement.JEM_TYPE:
99 case JavaElement.JEM_PACKAGEDECLARATION:
100 case JavaElement.JEM_IMPORTDECLARATION:
101 case JavaElement.JEM_LOCALVARIABLE:
102 case JavaElement.JEM_TYPE_PARAMETER:
103 break loop;
104 }
105 this.index++;
106 }
107 if (buffer != null) {
108 buffer.append(this.memento, start, this.index - start);
109 return buffer.toString();
110 } else {
111 return new String (this.memento, start, this.index - start);
112 }
113 }
114
115 }
116 |
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