Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ExpressionManager |
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| 1.0;1 |
1 | /* | |
2 | * Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com | |
3 | * The software in this package is published under the terms of the CPAL v1.0 | |
4 | * license, a copy of which has been included with this distribution in the | |
5 | * LICENSE.txt file. | |
6 | */ | |
7 | package org.mule.api.expression; | |
8 | ||
9 | import org.mule.api.MuleMessage; | |
10 | ||
11 | /** | |
12 | * Provides universal access for evaluating expressions embedded in Mule configurations, such as Xml, Java, | |
13 | * scripting and annotations. | |
14 | * <p/> | |
15 | * Users can register or unregister {@link ExpressionEvaluator} through this interface. | |
16 | */ | |
17 | public interface ExpressionManager | |
18 | { | |
19 | String DEFAULT_EXPRESSION_PREFIX = "#["; | |
20 | String DEFAULT_EXPRESSION_POSTFIX = "]"; | |
21 | ||
22 | public void registerEvaluator(ExpressionEvaluator evaluator); | |
23 | ||
24 | /** | |
25 | * Checks whether an evaluator is registered with the manager | |
26 | * | |
27 | * @param name the name of the expression evaluator | |
28 | * @return true if the evaluator is registered with the manager, false otherwise | |
29 | */ | |
30 | public boolean isEvaluatorRegistered(String name); | |
31 | ||
32 | /** | |
33 | * Removes the evaluator with the given name | |
34 | * | |
35 | * @param name the name of the evaluator to remove | |
36 | * @return the evaluator that was removed. This will be null if the evaluator was not registered | |
37 | */ | |
38 | public ExpressionEvaluator unregisterEvaluator(String name); | |
39 | ||
40 | public void registerEnricher(ExpressionEnricher enricher); | |
41 | ||
42 | /** | |
43 | * Checks whether an enricher is registered with the manager | |
44 | * | |
45 | * @param name the name of the expression enricher | |
46 | * @return true if the enricher is registered with the manager, false otherwise | |
47 | */ | |
48 | public boolean isEnricherRegistered(String name); | |
49 | ||
50 | /** | |
51 | * Removes the enricher with the given name | |
52 | * | |
53 | * @param name the name of the enricher to remove | |
54 | * @return the enricher that was removed. This will be null if the enricher was not registered | |
55 | */ | |
56 | public ExpressionEnricher unregisterEnricher(String name); | |
57 | ||
58 | /** | |
59 | * Evaluates the given expression. The expression should be a single expression definition with or without | |
60 | * enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" are both valid. For situations where | |
61 | * one or more expressions need to be parsed within a single text, the {@link #parse(String,org.mule.api.MuleMessage,boolean)} | |
62 | * method should be used since it will iterate through all expressions in a string. | |
63 | * | |
64 | * @param expression a single expression i.e. xpath://foo | |
65 | * @param message The current message being processed | |
66 | * @return the result of the evaluation | |
67 | * @throws ExpressionRuntimeException if the expression is invalid, or a null is found for the expression and | |
68 | * 'failIfNull is set to true. | |
69 | */ | |
70 | public Object evaluate(String expression, MuleMessage message) throws ExpressionRuntimeException; | |
71 | ||
72 | /** | |
73 | * Evaluates the given expression. The expression should be a single expression definition with or without | |
74 | * enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" are both valid. For situations where | |
75 | * one or more expressions need to be parsed within a single text, the {@link #parse(String,org.mule.api.MuleMessage,boolean)} | |
76 | * method should be used since it will iterate through all expressions in a string. | |
77 | * | |
78 | * @param expression a single expression i.e. xpath://foo | |
79 | * @param message The current message being processed | |
80 | * @param failIfNull determines if an exception should be thrown if expression could not be evaluated or returns | |
81 | * null. @return the result of the evaluation | |
82 | * @return the parsered expression string | |
83 | * @throws ExpressionRuntimeException if the expression is invalid, or a null is found for the expression and | |
84 | * 'failIfNull is set to true. | |
85 | */ | |
86 | public Object evaluate(String expression, MuleMessage message, boolean failIfNull) throws ExpressionRuntimeException; | |
87 | ||
88 | /** | |
89 | * Evaluates the given expression. The expression should be a single expression definition with or without | |
90 | * enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" are both valid. For situations where | |
91 | * one or more expressions need to be parsed within a single text, the {@link #parse(String,org.mule.api.MuleMessage,boolean)} | |
92 | * method should be used since it will iterate through all expressions in a string. | |
93 | * | |
94 | * @param expression one or more expressions ebedded in a literal string i.e. "Value is #[xpath://foo] other value is #[header:foo]." | |
95 | * @param evaluator the evaluator to use when executing the expression | |
96 | * @param message The current message being processed | |
97 | * @param failIfNull determines if an exception should be thrown if expression could not be evaluated or returns | |
98 | * null. @return the result of the evaluation | |
99 | * @return the parsered expression string | |
100 | * @throws ExpressionRuntimeException if the expression is invalid, or a null is found for the expression and | |
101 | * 'failIfNull is set to true. | |
102 | */ | |
103 | public Object evaluate(String expression, String evaluator, MuleMessage message, boolean failIfNull) throws ExpressionRuntimeException; | |
104 | ||
105 | /** | |
106 | * Evaluates the given expression resolving the result of the evaluation to a | |
107 | * boolean. The expression should be a single expression definition with or | |
108 | * without enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" | |
109 | * are both valid. | |
110 | * | |
111 | * @param expression a single expression i.e. header:foo=bar | |
112 | * @param evaluator the evaluator to use when executing the expression | |
113 | * @param message The current message being processed | |
114 | */ | |
115 | public boolean evaluateBoolean(String expression, String evaluator, MuleMessage message) throws ExpressionRuntimeException; | |
116 | ||
117 | /** | |
118 | * Evaluates the given expression resolving the result of the evaluation to a | |
119 | * boolean. The expression should be a single expression definition with or | |
120 | * without enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" | |
121 | * are both valid. | |
122 | * | |
123 | * @param expression a single expression i.e. header:foo=bar | |
124 | * @param message The current message being processed | |
125 | */ | |
126 | public boolean evaluateBoolean(String expression, MuleMessage message) throws ExpressionRuntimeException; | |
127 | ||
128 | /** | |
129 | * Evaluates the given expression resolving the result of the evaluation to a | |
130 | * boolean. The expression should be a single expression definition with or | |
131 | * without enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" | |
132 | * are both valid. | |
133 | * | |
134 | * @param expression a single expression i.e. header:foo=bar | |
135 | * @param evaluator the evaluator to use when executing the expression | |
136 | * @param message The current message being processed | |
137 | * @param nullReturnsTrue determines if true should be returned if the result of | |
138 | * the evaluation is null | |
139 | * @param nonBooleanReturnsTrue determines if true should returned if the result | |
140 | * is not null but isn't recognised as a boolean | |
141 | */ | |
142 | public boolean evaluateBoolean(String expression, String evaluator, MuleMessage message, boolean nullReturnsTrue, boolean nonBooleanReturnsTrue) throws ExpressionRuntimeException; | |
143 | ||
144 | /** | |
145 | * Evaluates the given expression resolving the result of the evaluation to a | |
146 | * boolean. The expression should be a single expression definition with or | |
147 | * without enclosing braces. i.e. "mule:serviceName" and "#[mule:serviceName]" | |
148 | * are both valid. | |
149 | * | |
150 | * @param expression a single expression i.e. header:foo=bar | |
151 | * @param message The current message being processed | |
152 | * @param nullReturnsTrue determines if true should be returned if the result of | |
153 | * the evaluation is null | |
154 | * @param nonBooleanReturnsTrue determines if true should returned if the result | |
155 | * is not null but isn't recognised as a boolean | |
156 | */ | |
157 | public boolean evaluateBoolean(String expression, MuleMessage message, boolean nullReturnsTrue, boolean nonBooleanReturnsTrue) throws ExpressionRuntimeException; | |
158 | ||
159 | /** | |
160 | * Enriches the current message using | |
161 | * @param expression a single expression i.e. header://foo that defines how the message shoud be enriched | |
162 | * @param message The current message being processed that will be enriched | |
163 | * @param object The object that will be used to enrich the message | |
164 | */ | |
165 | public void enrich(String expression, MuleMessage message, Object object); | |
166 | ||
167 | /** | |
168 | * Enriches the current message | |
169 | * @param expression a single expression i.e. header://foo that defines how the message shoud be enriched | |
170 | * @param enricher the enricher to use when executing the expression | |
171 | * @param message The current message being processed that will be enriched | |
172 | * @param object The object that will be used to enrich the message | |
173 | */ | |
174 | public void enrich(String expression, String enricher, MuleMessage message, Object object); | |
175 | ||
176 | /** | |
177 | * Evaluates expressions in a given string. This method will iterate through each expression and evaluate it. If | |
178 | * a user needs to evaluate a single expression they can use {@link #evaluate(String,org.mule.api.MuleMessage,boolean)}. | |
179 | * | |
180 | * @param expression one or more expressions ebedded in a literal string i.e. "Value is #[xpath://foo] other value is #[header:foo]." | |
181 | * @param message The current message being processed | |
182 | * @return the result of the evaluation | |
183 | * @throws org.mule.api.expression.ExpressionRuntimeException | |
184 | * if the expression is invalid, or a null is found for the expression and | |
185 | * 'failIfNull is set to true. | |
186 | */ | |
187 | public String parse(String expression, MuleMessage message) throws ExpressionRuntimeException; | |
188 | ||
189 | /** | |
190 | * Evaluates expressions in a given string. This method will iterate through each expression and evaluate it. If | |
191 | * a user needs to evaluate a single expression they can use {@link #evaluate(String,org.mule.api.MuleMessage,boolean)}. | |
192 | * | |
193 | * @param expression one or more expressions ebedded in a literal string i.e. "Value is #[xpath://foo] other value is #[header:foo]." | |
194 | * @param message The current message being processed | |
195 | * @param failIfNull determines if an exception should be thrown if expression could not be evaluated or returns | |
196 | * null. @return the result of the evaluation | |
197 | * @return the parsered expression string | |
198 | * @throws ExpressionRuntimeException if the expression is invalid, or a null is found for the expression and | |
199 | * 'failIfNull is set to true. | |
200 | */ | |
201 | public String parse(final String expression, final MuleMessage message, final boolean failIfNull) throws ExpressionRuntimeException; | |
202 | ||
203 | /** | |
204 | * Clears all registered evaluators from the manager. | |
205 | */ | |
206 | public void clearEvaluators(); | |
207 | ||
208 | /** | |
209 | * Clears all registered enrichers from the manager. | |
210 | */ | |
211 | public void clearEnrichers(); | |
212 | ||
213 | /** | |
214 | * Determines if the expression is valid or not. This method will validate a single expression or | |
215 | * expressions embedded in a string. the expression must be well formed i.e. #[bean:user] | |
216 | * | |
217 | * @param expression the expression to validate | |
218 | * @return true if the expression evaluator is recognised | |
219 | */ | |
220 | public boolean isValidExpression(String expression); | |
221 | ||
222 | /** | |
223 | * Determines if the expression is valid or not. This method will validate a single expression or | |
224 | * expressions embedded in a string. the expression must be well formed i.e. #[bean:user] | |
225 | * | |
226 | * @param expression the expression to validate | |
227 | * @throws InvalidExpressionException if the expression is invalid, including information about the position and fault | |
228 | * | |
229 | * @since 3.0 | |
230 | */ | |
231 | public void validateExpression(String expression) throws InvalidExpressionException; | |
232 | ||
233 | /** | |
234 | * Determines if the string is an expression. This method will validate that the string contains either the expression | |
235 | * prefix (malformed) or a full expression. This isn't full proof but catches most error cases | |
236 | * | |
237 | * @param string is this string an expression string | |
238 | * @return true if the string contains an expression | |
239 | * | |
240 | * @since 3.0 | |
241 | */ | |
242 | public boolean isExpression(String string); | |
243 | ||
244 | } |