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org.apache.commons.jelly.impl.DynamicTagLibrary$1 |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jelly.impl; |
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17 | ||
18 | import java.util.HashMap; |
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19 | import java.util.Map; |
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20 | ||
21 | import org.apache.commons.jelly.JellyException; |
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22 | import org.apache.commons.jelly.Script; |
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23 | import org.apache.commons.jelly.Tag; |
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24 | import org.apache.commons.jelly.TagLibrary; |
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25 | import org.xml.sax.Attributes; |
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26 | ||
27 | /** |
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28 | * <p><code>DynamicTagLibrary</code> represents a TagLibrary which |
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29 | * gets created by running a Jelly script.</p> |
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30 | * |
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31 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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32 | * @version $Revision: 1.6 $ |
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33 | */ |
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34 | public class DynamicTagLibrary extends TagLibrary { |
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35 | ||
36 | private String uri; |
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37 | private Map templates = new HashMap(); |
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38 | private TagLibrary parent; |
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39 | ||
40 | public DynamicTagLibrary() { |
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41 | } |
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42 | ||
43 | public DynamicTagLibrary(String uri) { |
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44 | this.uri = uri; |
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45 | } |
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46 | ||
47 | /** Creates a new script to execute the given tag name and attributes */ |
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48 | public TagScript createTagScript(final String name, class="keyword">final Attributes attributes) |
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49 | throws JellyException { |
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50 | ||
51 | return new TagScript( |
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52 | new TagFactory() { |
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53 | 0 | public Tag createTag(String name, Attributes attributes) throws JellyException { |
54 | 0 | return DynamicTagLibrary.this.createTag(name, attributes); |
55 | } |
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56 | } |
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57 | ); |
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58 | } |
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59 | ||
60 | /** Creates a new Tag for the given tag name if it exists */ |
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61 | public Tag createTag(String name, Attributes attributes) |
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62 | throws JellyException { |
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63 | ||
64 | Object value = templates.get(name); |
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65 | if ( value instanceof Script ) { |
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66 | Script template = (Script) value; |
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67 | return new DynamicTag(template); |
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68 | } |
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69 | else if ( value instanceof TagFactory ) { |
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70 | TagFactory factory = (TagFactory) value; |
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71 | return factory.createTag(name, attributes); |
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72 | } |
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73 | else if ( parent != null ) { |
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74 | // delegate to the parent |
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75 | return parent.createTag(name, attributes); |
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76 | } |
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77 | ||
78 | return null; |
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79 | } |
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80 | ||
81 | /** |
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82 | * Creates a new tag with the given name and template |
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83 | */ |
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84 | public void registerDynamicTag(String name, Script template) { |
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85 | templates.put(name, template); |
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86 | } |
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87 | ||
88 | /** |
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89 | * Creates a new Jelly Bean Tag with the given name |
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90 | */ |
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91 | public void registerBeanTag(String name, TagFactory factory) { |
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92 | templates.put(name, factory); |
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93 | } |
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94 | ||
95 | /** |
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96 | * Returns the script associated with the given tag name |
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97 | * |
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98 | * @param name The tag name |
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99 | * @return The script associated with <code>name</code>, or |
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100 | * <code>null</code> if the tag doesn't exist or isn't a script |
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101 | */ |
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102 | public Script getDynamicTag(String name) { |
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103 | Object result = templates.get(name); |
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104 | return (result instanceof Script) ? (Script) result : null; |
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105 | } |
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106 | ||
107 | /** |
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108 | * Returns the tag library instance which contains the named tag. |
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109 | * <p/> |
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110 | * If the tag is not registered within this library, the set of |
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111 | * parent libraries will be searched. |
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112 | * |
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113 | * @param name The tag name |
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114 | * @return The tag library containing the named tag, or <code>null</code> |
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115 | * if the tag is not registered. |
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116 | */ |
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117 | public DynamicTagLibrary find(String name) { |
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118 | DynamicTagLibrary result = null; |
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119 | if (templates.get(name) != null) { |
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120 | result = this; |
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121 | } |
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122 | else if (parent instanceof DynamicTagLibrary) { |
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123 | result = ((DynamicTagLibrary) parent).find(name); |
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124 | } |
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125 | return result; |
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126 | } |
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127 | ||
128 | // Properties |
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129 | //------------------------------------------------------------------------- |
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130 | public String getUri() { |
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131 | return uri; |
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132 | } |
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133 | ||
134 | public void setUri(String uri) { |
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135 | this.uri = uri; |
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136 | } |
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137 | ||
138 | ||
139 | /** |
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140 | * Returns the parent library which will be used to resolve unknown tags. |
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141 | * @return TagLibrary |
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142 | */ |
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143 | public TagLibrary getParent() { |
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144 | return parent; |
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145 | } |
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146 | ||
147 | /** |
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148 | * Sets the parent to inherit tags from that are not defined in this library. |
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149 | * @param parent The parent to set |
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150 | */ |
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151 | public void setParent(TagLibrary parent) { |
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152 | this.parent = parent; |
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153 | } |
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154 | ||
155 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |