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package org.mule.expression; |
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import org.mule.api.MuleMessage; |
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import org.mule.api.expression.RequiredValueException; |
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import org.mule.api.transport.PropertyScope; |
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import org.mule.config.i18n.CoreMessages; |
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import org.mule.routing.filters.WildcardFilter; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import static org.mule.expression.ExpressionConstants.ALL_ARGUMENT; |
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import static org.mule.expression.ExpressionConstants.DELIM; |
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import static org.mule.expression.ExpressionConstants.OPTIONAL_ARGUMENT; |
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public final class ExpressionUtils |
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{ |
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private ExpressionUtils() |
35 | 0 | { |
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37 | 0 | } |
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public static Object getPropertyWithScope(String expression, MuleMessage msg) |
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{ |
41 | 0 | return getPropertyWithScope(expression, msg, Object.class); |
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} |
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@SuppressWarnings("unchecked") |
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public static <T> T getPropertyWithScope(String expression, MuleMessage msg, Class<T> type) |
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{ |
57 | 0 | PropertyScope defaultScope = getScope(expression); |
58 | 0 | if (defaultScope != null) |
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{ |
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|
61 | 0 | expression = expression.substring(defaultScope.getScopeName().length() + 1); |
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} |
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else |
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{ |
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|
66 | 0 | defaultScope = PropertyScope.OUTBOUND; |
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} |
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|
69 | 0 | if (expression.contains(ALL_ARGUMENT)) |
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{ |
71 | 0 | WildcardFilter filter = new WildcardFilter(expression); |
72 | 0 | if (Map.class.isAssignableFrom(type)) |
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{ |
74 | 0 | Map<String, Object> props = new HashMap<String, Object>(); |
75 | 0 | for (String name : msg.getPropertyNames(defaultScope)) |
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{ |
77 | 0 | if (filter.accept(name)) |
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{ |
79 | 0 | props.put(name, msg.getProperty(name, defaultScope)); |
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} |
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} |
82 | 0 | return (T) returnMap(props, defaultScope); |
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} |
84 | 0 | else if (List.class.isAssignableFrom(type)) |
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{ |
86 | 0 | List<Object> values = new ArrayList<Object>(); |
87 | 0 | for (String name : msg.getPropertyNames(defaultScope)) |
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{ |
89 | 0 | if (filter.accept(name)) |
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{ |
91 | 0 | values.add(msg.getProperty(name, defaultScope)); |
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} |
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} |
94 | 0 | return (T) returnList(values, defaultScope); |
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} |
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else |
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{ |
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99 | 0 | throw new IllegalArgumentException("Type specified is not a collection type but '" + ALL_ARGUMENT + "' was specified for all properties. Type is: " + type); |
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} |
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} |
102 | 0 | else if (Map.class.isAssignableFrom(type)) |
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{ |
104 | 0 | String[] names = expression.split(DELIM); |
105 | 0 | Map<String, Object> props = new HashMap<String, Object>(); |
106 | 0 | for (String name : names) |
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{ |
108 | 0 | boolean required = true; |
109 | 0 | name = name.trim(); |
110 | 0 | PropertyScope scope = getScope(name); |
111 | 0 | if (scope != null) |
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{ |
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|
114 | 0 | name = name.substring(scope.getScopeName().length() + 1); |
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} |
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else |
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{ |
118 | 0 | scope = defaultScope; |
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} |
120 | 0 | if (name.endsWith(OPTIONAL_ARGUMENT)) |
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{ |
122 | 0 | name = name.substring(0, name.length() - OPTIONAL_ARGUMENT.length()); |
123 | 0 | required = false; |
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} |
125 | 0 | Object value = msg.getProperty(name, scope); |
126 | 0 | if (value == null && required) |
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{ |
128 | 0 | throw new RequiredValueException(CoreMessages.expressionEvaluatorReturnedNull("headers", scope.getScopeName() + ":" + name)); |
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} |
130 | 0 | else if (value != null) |
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{ |
132 | 0 | props.put(name, value); |
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} |
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} |
135 | 0 | return (T) returnMap(props, defaultScope); |
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} |
137 | 0 | else if (List.class.isAssignableFrom(type)) |
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{ |
139 | 0 | String[] names = expression.split(DELIM); |
140 | 0 | List<Object> values = new ArrayList<Object>(); |
141 | 0 | for (String name : names) |
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{ |
143 | 0 | boolean required = true; |
144 | 0 | name = name.trim(); |
145 | 0 | PropertyScope scope = getScope(name); |
146 | 0 | if (scope != null) |
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{ |
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|
149 | 0 | name = name.substring(scope.getScopeName().length() + 1); |
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} |
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else |
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{ |
153 | 0 | scope = defaultScope; |
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} |
155 | 0 | if (name.endsWith(OPTIONAL_ARGUMENT)) |
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{ |
157 | 0 | name = name.substring(0, name.length() - OPTIONAL_ARGUMENT.length()); |
158 | 0 | required = false; |
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} |
160 | 0 | name = name.trim(); |
161 | 0 | Object value = msg.getProperty(name, scope); |
162 | 0 | if (value == null && required) |
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{ |
164 | 0 | throw new RequiredValueException(CoreMessages.expressionEvaluatorReturnedNull("headers-list", scope.getScopeName() + ":" + name)); |
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} |
166 | 0 | else if (value != null) |
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{ |
168 | 0 | values.add(value); |
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} |
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} |
171 | 0 | return (T) returnList(values, defaultScope); |
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} |
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else |
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{ |
175 | 0 | boolean required = true; |
176 | 0 | if (expression.endsWith(OPTIONAL_ARGUMENT)) |
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{ |
178 | 0 | expression = expression.substring(0, expression.length() - OPTIONAL_ARGUMENT.length()); |
179 | 0 | required = false; |
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} |
181 | 0 | Object result = msg.getProperty(expression.trim(), defaultScope); |
182 | 0 | if (result == null && required) |
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{ |
184 | 0 | throw new RequiredValueException(CoreMessages.expressionEvaluatorReturnedNull("header", defaultScope.getScopeName() + ":" + expression)); |
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} |
187 | 0 | return (T) result; |
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} |
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} |
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private static Map<String, Object> returnMap(Map<String, Object> props, PropertyScope scope) |
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{ |
193 | 0 | Map<String, Object> p = (props.size() == 0 ? Collections.<String, Object>emptyMap() : props); |
194 | 0 | if (scope.equals(PropertyScope.INBOUND)) |
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{ |
196 | 0 | p = Collections.unmodifiableMap(p); |
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} |
198 | 0 | return p; |
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} |
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private static List<Object> returnList(List<Object> values, PropertyScope scope) |
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{ |
203 | 0 | List<Object> l = (values.size() == 0 ? Collections.emptyList() : values); |
204 | 0 | if (scope.equals(PropertyScope.INBOUND)) |
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{ |
206 | 0 | l = Collections.unmodifiableList(l); |
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} |
208 | 0 | return l; |
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} |
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private static PropertyScope getScope(String expression) |
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{ |
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|
214 | 0 | final String[] tokens = expression.split(":", 2); |
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PropertyScope scope; |
216 | 0 | if (tokens.length == 2) |
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{ |
218 | 0 | final String candidate = tokens[0]; |
219 | 0 | scope = PropertyScope.get(candidate.toLowerCase()); |
220 | 0 | if (scope == null) |
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{ |
222 | 0 | throw new IllegalArgumentException(String.format("'%s' is not a valid property scope.", candidate)); |
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} |
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|
225 | 0 | return scope; |
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} |
227 | 0 | return null; |
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} |
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} |