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org.apache.commons.jelly.tags.util.ReplaceTag |
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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 | ||
17 | package org.apache.commons.jelly.tags.util; |
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18 | ||
19 | import org.apache.commons.jelly.JellyTagException; |
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20 | import org.apache.commons.jelly.MissingAttributeException; |
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21 | import org.apache.commons.jelly.TagSupport; |
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22 | import org.apache.commons.jelly.XMLOutput; |
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23 | import org.apache.commons.jelly.expression.Expression; |
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24 | import org.apache.commons.logging.Log; |
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25 | import org.apache.commons.logging.LogFactory; |
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26 | ||
27 | import org.apache.commons.lang.StringUtils; |
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28 | ||
29 | import org.xml.sax.SAXException; |
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30 | ||
31 | /** |
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32 | * A tag that replaces occurrences of a character or string in its body or |
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33 | * (or value) and places the result into the context |
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34 | * |
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35 | * @author dion |
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36 | */ |
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37 | 6 | public class ReplaceTag extends TagSupport { |
38 | /** The Log to which logging calls will be made. */ |
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39 | 1 | private static final Log log = LogFactory.getLog(ReplaceTag.class); |
40 | ||
41 | /** The variable name to export. */ |
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42 | private String var; |
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43 | ||
44 | /** The expression to evaluate. */ |
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45 | private Expression value; |
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46 | ||
47 | /** the old character to be replaced */ |
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48 | private String oldChar; |
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49 | ||
50 | /** the new character that will replace the old */ |
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51 | private String newChar; |
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52 | ||
53 | /** the old string to be replace */ |
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54 | private String oldString; |
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55 | ||
56 | /** the new string that will replace the old */ |
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57 | private String newString; |
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58 | ||
59 | // Tag interface |
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60 | //------------------------------------------------------------------------- |
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61 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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62 | // check required properties |
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63 | 5 | if (oldChar != null) { |
64 | 4 | oldString = oldChar.substring(0,1); |
65 | } |
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66 | ||
67 | 5 | if (newChar != null) { |
68 | 4 | newString = newChar.substring(0,1); |
69 | } |
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70 | ||
71 | 5 | if (oldString == null) { |
72 | 0 | throw new MissingAttributeException("oldChar or oldString must be provided"); |
73 | } |
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74 | ||
75 | 5 | if (newString == null) { |
76 | 0 | throw new MissingAttributeException("newChar or newString must be provided"); |
77 | } |
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78 | ||
79 | // get either the value or the body of the tag |
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80 | 5 | Object answer = null; |
81 | 5 | if ( value != null ) { |
82 | 3 | answer = value.evaluateAsString(context); |
83 | } else { |
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84 | 2 | answer = getBodyText(false); |
85 | } |
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86 | ||
87 | // set the result in the context, or output it |
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88 | 5 | if (answer != null) { |
89 | 5 | String stringAnswer = StringUtils.replace(answer.toString(), oldString, newString); |
90 | 5 | if ( var != null ) { |
91 | 4 | context.setVariable(var, stringAnswer); |
92 | } else { |
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93 | try { |
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94 | 1 | output.write(stringAnswer); |
95 | 1 | } catch (SAXException e) { |
96 | 0 | throw new JellyTagException(e); |
97 | } |
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98 | } |
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99 | } |
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100 | 5 | } |
101 | ||
102 | /** |
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103 | * Returns the newChar used in replacing. Should only be a single |
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104 | * character. |
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105 | * @return String |
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106 | */ |
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107 | public String getNewChar() |
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108 | { |
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109 | 0 | return newChar; |
110 | } |
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111 | ||
112 | /** |
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113 | * Returns the oldChar that will be replaced. Should only be a single |
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114 | * character. |
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115 | * @return String |
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116 | */ |
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117 | public String getOldChar() |
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118 | { |
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119 | 0 | return oldChar; |
120 | } |
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121 | ||
122 | /** |
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123 | * Returns the newString that will be replaced. |
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124 | * @return String |
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125 | */ |
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126 | public String getNew() |
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127 | { |
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128 | 0 | return newString; |
129 | } |
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130 | ||
131 | /** |
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132 | * Returns the oldString that will be replaced. |
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133 | * @return String |
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134 | */ |
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135 | public String getOld() |
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136 | { |
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137 | 0 | return oldString; |
138 | } |
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139 | ||
140 | /** |
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141 | * Returns the value. |
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142 | * @return Expression |
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143 | */ |
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144 | public Expression getValue() |
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145 | { |
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146 | 0 | return value; |
147 | } |
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148 | ||
149 | /** |
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150 | * Returns the var. |
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151 | * @return String |
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152 | */ |
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153 | public String getVar() |
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154 | { |
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155 | 0 | return var; |
156 | } |
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157 | ||
158 | /** |
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159 | * Sets the newChar. |
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160 | * @param newChar The newChar to set |
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161 | */ |
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162 | public void setNewChar(String newChar) |
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163 | { |
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164 | 4 | this.newChar = newChar; |
165 | 4 | } |
166 | ||
167 | /** |
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168 | * Sets the oldChar. |
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169 | * @param oldChar The oldChar to set |
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170 | */ |
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171 | public void setOldChar(String oldChar) |
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172 | { |
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173 | 4 | this.oldChar = oldChar; |
174 | 4 | } |
175 | ||
176 | /** |
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177 | * Sets the newString. |
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178 | * @param newString The newString to set |
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179 | */ |
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180 | public void setNew(String newString) |
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181 | { |
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182 | 1 | this.newString = newString; |
183 | 1 | } |
184 | ||
185 | /** |
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186 | * Sets the oldString. |
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187 | * @param oldString The oldString to set |
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188 | */ |
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189 | public void setOld(String oldString) |
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190 | { |
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191 | 1 | this.oldString = oldString; |
192 | 1 | } |
193 | ||
194 | /** |
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195 | * Sets the value. |
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196 | * @param value The value to set |
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197 | */ |
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198 | public void setValue(Expression value) |
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199 | { |
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200 | 3 | this.value = value; |
201 | 3 | } |
202 | ||
203 | /** |
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204 | * Sets the var. |
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205 | * @param var The var to set |
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206 | */ |
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207 | public void setVar(String var) |
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208 | { |
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209 | 4 | this.var = class="keyword">var; |
210 | 4 | } |
211 | ||
212 | } |
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