Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AbstractToken |
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| 2.6666666666666665;2.667 |
1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.tapestry.script; | |
16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; | |
18 | import org.apache.hivemind.Location; | |
19 | ||
20 | import java.util.ArrayList; | |
21 | import java.util.Iterator; | |
22 | import java.util.List; | |
23 | ||
24 | /** | |
25 | * Base class for creating tokens which may contain other tokens. | |
26 | * | |
27 | * @author Howard Lewis Ship | |
28 | * @since 0.2.9 | |
29 | */ | |
30 | ||
31 | abstract class AbstractToken implements IScriptToken | |
32 | { | |
33 | private List _tokens; | |
34 | ||
35 | private Location _location; | |
36 | ||
37 | protected AbstractToken(Location location) | |
38 | 0 | { |
39 | 0 | _location = location; |
40 | 0 | } |
41 | ||
42 | public Location getLocation() | |
43 | { | |
44 | 0 | return _location; |
45 | } | |
46 | ||
47 | public void addToken(IScriptToken token) | |
48 | { | |
49 | 0 | if (_tokens == null) |
50 | 0 | _tokens = new ArrayList(); |
51 | ||
52 | 0 | _tokens.add(token); |
53 | 0 | } |
54 | ||
55 | /** | |
56 | * Invokes {@link IScriptToken#write(StringBuffer,ScriptSession)}on each child token (if there | |
57 | * are any). | |
58 | */ | |
59 | ||
60 | protected void writeChildren(StringBuffer buffer, ScriptSession session) | |
61 | { | |
62 | 0 | if (_tokens == null) |
63 | 0 | return; |
64 | ||
65 | 0 | Iterator i = _tokens.iterator(); |
66 | ||
67 | 0 | while (i.hasNext()) |
68 | { | |
69 | 0 | IScriptToken token = (IScriptToken) i.next(); |
70 | ||
71 | 0 | token.write(buffer, session); |
72 | 0 | } |
73 | 0 | } |
74 | ||
75 | /** | |
76 | * Evaluates the expression against the session's symbols, using | |
77 | * {@link org.apache.tapestry.services.ExpressionEvaluator#read(Object, String)} and returns the result. | |
78 | */ | |
79 | protected Object evaluate(String expression, ScriptSession session) | |
80 | { | |
81 | ||
82 | try | |
83 | { | |
84 | 0 | return session.evaluate(expression); |
85 | } | |
86 | 0 | catch (Exception ex) |
87 | { | |
88 | 0 | throw new ApplicationRuntimeException(ex.getMessage(), _location, ex); |
89 | } | |
90 | } | |
91 | ||
92 | /** | |
93 | * Evaluates an expression and coerces the result to a boolean. | |
94 | * | |
95 | * @since 4.0 | |
96 | */ | |
97 | ||
98 | protected boolean evaluateBoolean(String expression, ScriptSession session) | |
99 | { | |
100 | try | |
101 | { | |
102 | 0 | Boolean b = (Boolean) session.evaluate(expression, Boolean.class); |
103 | ||
104 | 0 | return b.booleanValue(); |
105 | } | |
106 | 0 | catch (Exception ex) |
107 | { | |
108 | 0 | throw new ApplicationRuntimeException(ex.getMessage(), _location, ex); |
109 | } | |
110 | } | |
111 | } |