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1
28
29 package com.caucho.jstl.el;
30
31 import com.caucho.el.Expr;
32 import com.caucho.jsp.PageContextImpl;
33 import com.caucho.util.CharBuffer;
34 import com.caucho.util.L10N;
35
36 import javax.el.ELContext;
37 import javax.servlet.jsp.JspException  ;
38 import java.util.Iterator ;
39
40 public class ForTokensTag extends ForEachTag {
41 private static L10N L = new L10N(ForTokensTag.class);
42
43 private Expr _delimsExpr;
44
45
48 public void setDelims(Expr delims)
49 {
50 _delimsExpr = delims;
51 }
52
53
56 public int doStartTag()
57 throws JspException
58 {
59 try {
60 _iterator = null;
61 _index = 0;
62 _count = 0;
63
64 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
65 ELContext env = pageContext.getELContext();
66
67 if (_beginExpr != null)
68 _begin = (int) _beginExpr.evalLong(env);
69 else
70 _begin = -1;
71
72 if (_endExpr != null)
73 _end = (int) _endExpr.evalLong(env);
74 else
75 _end = Integer.MAX_VALUE;
76
77 if (_stepExpr != null)
78 _step = (int) _stepExpr.evalLong(env);
79 else
80 _step = 0;
81
82 String items = _itemsExpr.evalString(env);
83 String delims = _delimsExpr.evalString(env);
84
85 _iterator = new TokenIterator(items, delims);
86
87 while (_index < _begin && _iterator.hasNext()) {
88 _index++;
89 _iterator.next();
90 }
91
92 if (_varStatus != null)
93 pageContext.setAttribute(_varStatus, this);
94
95 return doAfterBody();
96 } catch (Exception e) {
97 throw new JspException (e);
98 }
99 }
100
101 public class TokenIterator implements Iterator {
102 private String value;
103 private char []delims;
104 private int length;
105 private int i;
106 private CharBuffer cb = new CharBuffer();
107
108 TokenIterator(String value, String delims)
109 {
110 this.value = value;
111 this.delims = delims.toCharArray();
112 this.length = value.length();
113 }
114
115 public boolean hasNext()
116 {
117 return i < length;
118 }
119
120 public Object next()
121 {
122 cb.clear();
123
124 char ch = 0;
125 int startDelims = delims.length - 1;
126 loop:
127 for (; i < length; i++) {
128 ch = value.charAt(i);
129
130 for (int j = startDelims; j >= 0; j--) {
131 if (delims[j] == ch)
132 break loop;
133 }
134
135 cb.append(ch);
136 }
137
138 i++;
139
140 return cb.toString();
141 }
142
143 public void remove()
144 {
145 throw new UnsupportedOperationException ();
146 }
147 }
148 }
149 |
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