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1
29
30 package com.caucho.jstl.el;
31
32 import com.caucho.el.Expr;
33 import com.caucho.jsp.PageContextImpl;
34 import com.caucho.jstl.NameValueTag;
35 import com.caucho.util.CharBuffer;
36 import com.caucho.util.L10N;
37
38 import javax.servlet.http.HttpServletRequest  ;
39 import javax.servlet.http.HttpServletResponse ;
40 import javax.servlet.jsp.JspException ;
41 import javax.servlet.jsp.JspWriter ;
42 import javax.servlet.jsp.PageContext ;
43 import javax.servlet.jsp.tagext.TagSupport ;
44 import java.io.IOException ;
45
46 public class UrlTag extends TagSupport implements NameValueTag {
47 private static final L10N L = new L10N(ImportTag.class);
48
49 private Expr _valueExpr;
50 private Expr _contextExpr;
51
52 private String _var;
53 private String _scope;
54
55 private CharBuffer _url;
56
57
60 public void setValue(Expr value)
61 {
62 _valueExpr = value;
63 }
64
65
68 public void setContext(Expr context)
69 {
70 _contextExpr = context;
71 }
72
73
76 public void setVar(String var)
77 {
78 _var = var;
79 }
80
81
84 public void setScope(String scope)
85 {
86 _scope = scope;
87 }
88
89
92 public void addParam(String name, String value)
93 {
94 String encoding = this.pageContext.getResponse().getCharacterEncoding();
95
96 com.caucho.jstl.rt.CoreUrlTag.addParam(_url, name, value, encoding);
97 }
98
99 public int doStartTag() throws JspException
100 {
101 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
102
103 String value = _valueExpr.evalString(pageContext.getELContext());
104 String context = null;
105
106 if (_contextExpr != null)
107 context = _contextExpr.evalString(pageContext.getELContext());
108
109 _url = normalizeURL(pageContext, value, context);
110
111 return EVAL_BODY_INCLUDE;
112 }
113
114 public int doEndTag() throws JspException
115 {
116 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
117
118 String value = encodeURL(pageContext, _url);
119
120 try {
121 if (_var == null) {
122 JspWriter out = pageContext.getOut();
123
124 out.print(value);
125 }
126 else
127 CoreSetTag.setValue(pageContext, _var, _scope, value);
128 } catch (IOException e) {
129 throw new JspException (e);
130 }
131
132 return EVAL_PAGE;
133 }
134
135 public static CharBuffer normalizeURL(PageContext pageContext,
136 String url, String context)
137 throws JspException
138 {
139 if (url == null)
140 url = "";
141
142 CharBuffer value = new CharBuffer();
143
144 int slash = url.indexOf('/');
145 int colon = url.indexOf(':');
146
147 if (colon > 0 && colon < slash) {
148 value.append(url);
149 }
150 else if (slash == 0) {
151 HttpServletRequest request;
152 request = (HttpServletRequest ) pageContext.getRequest();
153
154 if (context != null) {
155 value.append(context);
156 value.append(url);
157 }
158 else {
159 value.append(request.getContextPath());
160 value.append(url);
161 }
162 }
163 else {
164 if (context != null) {
165 value.append(context);
166 value.append(url);
167 }
168 else
169 value.append(url);
170 }
171
172 return value;
173 }
174
175 public static String encodeURL(PageContext pageContext, CharBuffer url)
176 {
177 String value = url.toString();
178
179 int colon = value.indexOf(':');
180 int slash = value.indexOf('/');
181
182 if (colon < slash && slash > 0)
183 return value;
184 else
185 return ((HttpServletResponse ) pageContext.getResponse()).encodeURL(value);
186
192 }
193 }
194 |
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