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org.apache.commons.jelly.expression.CompositeExpression |
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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.expression; |
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17 | ||
18 | import java.util.ArrayList; |
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19 | import java.util.Collections; |
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20 | import java.util.Iterator; |
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21 | import java.util.List; |
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22 | ||
23 | import org.apache.commons.collections.iterators.SingletonIterator; |
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24 | ||
25 | import org.apache.commons.jelly.JellyContext; |
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26 | import org.apache.commons.jelly.JellyException; |
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27 | ||
28 | /** |
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29 | * <p><code>CompositeExpression</code> is a Composite expression made up of several |
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30 | * Expression objects which are concatenated into a single String.</p> |
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31 | * |
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32 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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33 | * @version $Revision: 155420 $ |
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34 | */ |
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35 | public class CompositeExpression extends ExpressionSupport { |
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36 | ||
37 | /** The expressions */ |
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38 | private List expressions; |
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39 | ||
40 | 533 | public CompositeExpression() { |
41 | 533 | this.expressions = new ArrayList(); |
42 | 533 | } |
43 | ||
44 | 0 | public CompositeExpression(List expressions) { |
45 | 0 | this.expressions = expressions; |
46 | 0 | } |
47 | ||
48 | public String toString() { |
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49 | 0 | return super.toString() + "[expressions=" + expressions +"]"; |
50 | } |
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51 | ||
52 | /** |
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53 | * Parses the given String to be either a ConstantExpresssion, an Expression denoted as |
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54 | * "${foo}" or some String with embedded expresssions such as "abc${something}def${else}xyz" |
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55 | * which results in a CompositeExpression being returned. |
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56 | * |
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57 | * @param text is the String to parse into expressions |
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58 | * @param factory is the Factory of Expression objects used to create expresssions for the contents |
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59 | * of the String "foo" inside expressions such as "${foo}" |
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60 | * |
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61 | * @return the Expresssion for the given String. |
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62 | * @throws JellyException if the text is invalid (such as missing '}' character). |
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63 | * @throws JellyException if there was some problem creating the underlying Expression object |
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64 | * from the ExpressionFactory |
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65 | */ |
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66 | public static Expression parse(String text, ExpressionFactory factory) throws JellyException { |
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67 | ||
68 | 53950 | int len = text.length(); |
69 | ||
70 | 53950 | int startIndex = text.indexOf( "${" ); |
71 | ||
72 | 53950 | if ( startIndex < 0) { |
73 | 46410 | return new ConstantExpression(text); |
74 | } |
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75 | ||
76 | 7540 | int endIndex = text.indexOf( "}", startIndex+2 ); |
77 | ||
78 | 7540 | if ( endIndex < 0 ) { |
79 | 0 | throw new JellyException( "Missing '}' character at the end of expression: " + text ); |
80 | } |
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81 | 7540 | if ( startIndex == 0 && endIndex == len - 1 ) { |
82 | 7007 | return factory.createExpression(text.substring(2, endIndex)); |
83 | } |
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84 | ||
85 | 533 | CompositeExpression answer = new CompositeExpression(); |
86 | ||
87 | 533 | int cur = 0; |
88 | 533 | char c = 0; |
89 | ||
90 | 533 | StringBuffer chars = new StringBuffer(); |
91 | 533 | StringBuffer expr = new StringBuffer(); |
92 | ||
93 | MAIN: |
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94 | 11232 | while ( cur < len ) { |
95 | 10699 | c = text.charAt( cur ); |
96 | ||
97 | 10699 | switch ( c ) { |
98 | case('$'): |
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99 | 988 | if ( cur+1<len ) { |
100 | 988 | ++cur; |
101 | 988 | c = text.charAt( cur ); |
102 | ||
103 | 988 | switch ( c ) { |
104 | case('$'): |
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105 | 0 | chars.append( c ); |
106 | 0 | break; |
107 | case('{'): |
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108 | 988 | if ( chars.length() > 0 ) { |
109 | 507 | answer.addTextExpression( chars.toString() ); |
110 | 507 | chars.delete(0, chars.length() ); |
111 | } |
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112 | ||
113 | 988 | if (cur+1<len) { |
114 | 988 | ++cur; |
115 | ||
116 | 10881 | while (cur<len) { |
117 | 10881 | c = text.charAt(cur); |
118 | 10881 | switch ( c ) { |
119 | case('"'): |
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120 | 13 | expr.append( c ); |
121 | 13 | ++cur; |
122 | ||
123 | DOUBLE_QUOTE: |
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124 | 91 | while(cur<len) { |
125 | 91 | c = text.charAt(cur); |
126 | ||
127 | 91 | switch ( c ) { |
128 | case('\\'): |
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129 | 0 | ++cur; |
130 | 0 | expr.append(c); |
131 | 0 | break; |
132 | case('"'): |
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133 | 13 | ++cur; |
134 | 13 | expr.append(c); |
135 | 13 | break DOUBLE_QUOTE; |
136 | default: |
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137 | 78 | ++cur; |
138 | 78 | expr.append(c); |
139 | } // switch |
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140 | 78 | } // while |
141 | break; |
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142 | case('\''): |
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143 | 0 | expr.append( c ); |
144 | 0 | ++cur; |
145 | ||
146 | SINGLE_QUOTE: |
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147 | 0 | while(cur<len) { |
148 | 0 | c = text.charAt(cur); |
149 | ||
150 | 0 | switch ( c ) { |
151 | case('\\'): |
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152 | 0 | ++cur; |
153 | 0 | expr.append(c); |
154 | 0 | break; |
155 | case('\''): |
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156 | 0 | ++cur; |
157 | 0 | expr.append(c); |
158 | 0 | break SINGLE_QUOTE; |
159 | default: |
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160 | 0 | ++cur; |
161 | 0 | expr.append(c); |
162 | } // switch |
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163 | 0 | } // while |
164 | break; |
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165 | case('}'): |
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166 | 988 | answer.addExpression(factory.createExpression(expr.toString())); |
167 | 988 | expr.delete(0, expr.length()); |
168 | 988 | ++cur; |
169 | 988 | continue MAIN; |
170 | default: |
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171 | 9880 | expr.append( c ); |
172 | 9880 | ++cur; |
173 | } |
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174 | 9880 | } |
175 | } |
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176 | break; |
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177 | default: |
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178 | 0 | chars.append(c); |
179 | } |
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180 | 0 | } |
181 | else |
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182 | { |
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183 | 0 | chars.append(c); |
184 | } |
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185 | 0 | break; |
186 | default: |
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187 | 9711 | chars.append( c ); |
188 | } |
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189 | 9711 | ++cur; |
190 | 9711 | } |
191 | ||
192 | 533 | if ( chars.length() > 0 ) |
193 | { |
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194 | 286 | answer.addTextExpression( chars.toString() ); |
195 | } |
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196 | ||
197 | 533 | return answer; |
198 | } |
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199 | ||
200 | // Properties |
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201 | //------------------------------------------------------------------------- |
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202 | ||
203 | /** |
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204 | * @return the Expression objects that make up this |
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205 | * composite expression |
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206 | */ |
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207 | public List getExpressions() { |
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208 | 208 | return expressions; |
209 | } |
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210 | ||
211 | /** |
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212 | * Sets the Expression objects that make up this |
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213 | * composite expression |
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214 | */ |
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215 | public void setExpressions(List expressions) { |
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216 | 0 | this.expressions = expressions; |
217 | 0 | } |
218 | ||
219 | /** |
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220 | * Adds a new expression to the end of the expression list |
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221 | */ |
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222 | public void addExpression(Expression expression) { |
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223 | 1781 | expressions.add(expression); |
224 | 1781 | } |
225 | ||
226 | /** |
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227 | * A helper method to add a new constant text expression |
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228 | */ |
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229 | public void addTextExpression(String text) { |
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230 | 793 | addExpression(new ConstantExpression(text)); |
231 | 793 | } |
232 | ||
233 | // Expression interface |
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234 | //------------------------------------------------------------------------- |
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235 | ||
236 | public String getExpressionText() { |
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237 | 91 | StringBuffer buffer = new StringBuffer(); |
238 | 91 | for (Iterator iter = expressions.iterator(); iter.hasNext(); ) { |
239 | 273 | Expression expression = (Expression) iter.next(); |
240 | 273 | buffer.append( expression.getExpressionText() ); |
241 | 273 | } |
242 | 91 | return buffer.toString(); |
243 | } |
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244 | ||
245 | ||
246 | // inherit javadoc from interface |
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247 | public Object evaluate(JellyContext context) { |
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248 | 1456 | return evaluateAsString(context); |
249 | } |
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250 | ||
251 | // inherit javadoc from interface |
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252 | public String evaluateAsString(JellyContext context) { |
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253 | 1456 | StringBuffer buffer = new StringBuffer(); |
254 | 1456 | for (Iterator iter = expressions.iterator(); iter.hasNext(); ) { |
255 | 3003 | Expression expression = (Expression) iter.next(); |
256 | 3003 | String value = expression.evaluateAsString(context); |
257 | 3003 | if ( value != null ) { |
258 | 2977 | buffer.append( value ); |
259 | } |
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260 | 3003 | } |
261 | 1456 | return buffer.toString(); |
262 | ||
263 | } |
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264 | ||
265 | // inherit javadoc from interface |
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266 | public Iterator evaluateAsIterator(JellyContext context) { |
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267 | 0 | String value = evaluateAsString(context); |
268 | 0 | if ( value == null ) { |
269 | 0 | return Collections.EMPTY_LIST.iterator(); |
270 | } |
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271 | else { |
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272 | 0 | return new SingletonIterator( value ); |
273 | } |
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274 | } |
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275 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |