Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
RootContext |
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| 2.4;2.4 |
1 | /* |
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2 | * |
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3 | * Copyright 2005-2006 The Apache Software Foundation. |
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4 | * |
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5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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6 | * you may not use this file except in compliance with the License. |
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7 | * You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | * |
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17 | */ |
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18 | package org.apache.commons.scxml.env.jsp; |
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19 | ||
20 | import javax.servlet.jsp.JspContext; |
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21 | import javax.servlet.jsp.el.ELException; |
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22 | import javax.servlet.jsp.el.VariableResolver; |
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23 | ||
24 | /** |
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25 | * EL Context for root SCXML element. Wrapper around the host JSP context. |
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26 | * Must treat variables in the host JSP environments as read-only. |
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27 | * |
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28 | */ |
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29 | public final class RootContext extends ELContext { |
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30 | ||
31 | /** Host JSP's VariableResolver. */ |
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32 | private VariableResolver variableResolver; |
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33 | /** Bark if JSP Context is null. */ |
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34 | private static final String ERR_HOST_JSP_CTX_NULL = |
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35 | "Host JSP Context cannot be null"; |
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36 | ||
37 | /** |
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38 | * Constructor. |
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39 | * |
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40 | * @param ctx the host JspContext |
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41 | */ |
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42 | public RootContext(final JspContext ctx) { |
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43 | 1 | super(); |
44 | 1 | if (ctx == null) { |
45 | 0 | getLog().error(ERR_HOST_JSP_CTX_NULL); |
46 | 0 | throw new IllegalArgumentException(ERR_HOST_JSP_CTX_NULL); |
47 | } else { |
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48 | // only retain the VariableResolver |
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49 | 1 | this.variableResolver = ctx.getVariableResolver(); |
50 | } |
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51 | 1 | } |
52 | ||
53 | /** |
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54 | * Get the value of the given variable in this Context. |
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55 | * |
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56 | * @param name The name of the variable |
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57 | * @return The value (or null) |
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58 | * @see org.apache.commons.scxml.Context#get(java.lang.String) |
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59 | */ |
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60 | public Object get(final String name) { |
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61 | 5 | Object value = super.get(name); |
62 | 5 | if (value == null) { |
63 | try { |
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64 | 4 | value = variableResolver.resolveVariable(name); |
65 | 0 | } catch (ELException ele) { |
66 | 0 | getLog().error(ele.getMessage(), ele); |
67 | 4 | } |
68 | } |
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69 | 5 | return value; |
70 | } |
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71 | ||
72 | /** |
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73 | * Does the given variable exist in this Context. |
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74 | * |
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75 | * @param name The name of the variable |
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76 | * @return boolean true if the variable exists |
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77 | * @see org.apache.commons.scxml.Context#has(java.lang.String) |
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78 | */ |
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79 | public boolean has(final String name) { |
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80 | 2 | boolean exists = super.has(name); |
81 | 2 | Object value = null; |
82 | 2 | if (!exists) { |
83 | try { |
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84 | 2 | value = variableResolver.resolveVariable(name); |
85 | 0 | } catch (ELException ele) { |
86 | 0 | getLog().error(ele.getMessage(), ele); |
87 | 2 | } |
88 | 2 | if (value != null) { |
89 | 2 | exists = true; |
90 | } |
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91 | } |
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92 | 2 | return exists; |
93 | } |
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94 | ||
95 | /** |
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96 | * Get the VariableResolver associated with this root context. |
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97 | * |
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98 | * @return Returns the variableResolver. |
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99 | */ |
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100 | public VariableResolver getVariableResolver() { |
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101 | 0 | return variableResolver; |
102 | } |
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103 | ||
104 | /** |
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105 | * Set the VariableResolver associated with this root context. |
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106 | * |
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107 | * @param variableResolver The variableResolver to set. |
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108 | */ |
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109 | public void setVariableResolver(final VariableResolver variableResolver) { |
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110 | 0 | this.variableResolver = variableResolver; |
111 | 0 | } |
112 | ||
113 | } |
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114 |