| 1 |
|
|
| 2 |
|
|
| 3 |
|
|
| 4 |
|
|
| 5 |
|
|
| 6 |
|
|
| 7 |
|
|
| 8 |
|
|
| 9 |
|
|
| 10 |
|
|
| 11 |
|
|
| 12 |
|
|
| 13 |
|
|
| 14 |
|
|
| 15 |
|
|
| 16 |
|
|
| 17 |
|
package org.apache.camel.language.juel; |
| 18 |
|
|
| 19 |
|
import javax.el.ELContext; |
| 20 |
|
import javax.el.ExpressionFactory; |
| 21 |
|
import javax.el.ValueExpression; |
| 22 |
|
|
| 23 |
|
import de.odysseus.el.util.SimpleContext; |
| 24 |
|
|
| 25 |
|
import org.apache.camel.Exchange; |
| 26 |
|
import org.apache.camel.Message; |
| 27 |
|
import org.apache.camel.impl.ExpressionSupport; |
| 28 |
|
|
| 29 |
|
|
| 30 |
|
|
| 31 |
|
|
| 32 |
|
public class JuelExpression extends ExpressionSupport<Exchange> { |
| 33 |
|
|
| 34 |
|
private final String expression; |
| 35 |
|
private final Class<?> type; |
| 36 |
|
private ExpressionFactory expressionFactory; |
| 37 |
|
|
| 38 |
3 |
public JuelExpression(String expression, Class<?> type) { |
| 39 |
3 |
this.expression = expression; |
| 40 |
3 |
this.type = type; |
| 41 |
3 |
} |
| 42 |
|
|
| 43 |
|
public static JuelExpression el(String expression) { |
| 44 |
0 |
return new JuelExpression(expression, Object.class); |
| 45 |
|
} |
| 46 |
|
|
| 47 |
|
public Object evaluate(Exchange exchange) { |
| 48 |
|
|
| 49 |
|
|
| 50 |
3 |
ELContext context = populateContext(createContext(), exchange); |
| 51 |
3 |
ValueExpression valueExpression = getExpressionFactory().createValueExpression(context, expression, type); |
| 52 |
3 |
return valueExpression.getValue(context); |
| 53 |
|
} |
| 54 |
|
|
| 55 |
|
public ExpressionFactory getExpressionFactory() { |
| 56 |
12 |
if (expressionFactory == null) { |
| 57 |
3 |
expressionFactory = ExpressionFactory.newInstance(); |
| 58 |
|
} |
| 59 |
12 |
return expressionFactory; |
| 60 |
|
} |
| 61 |
|
|
| 62 |
|
public void setExpressionFactory(ExpressionFactory expressionFactory) { |
| 63 |
0 |
this.expressionFactory = expressionFactory; |
| 64 |
0 |
} |
| 65 |
|
|
| 66 |
|
protected ELContext populateContext(ELContext context, Exchange exchange) { |
| 67 |
3 |
setVariable(context, "exchange", exchange, Exchange.class); |
| 68 |
3 |
setVariable(context, "in", exchange.getIn(), Message.class); |
| 69 |
3 |
setVariable(context, "out", exchange.getOut(), Message.class); |
| 70 |
3 |
return context; |
| 71 |
|
} |
| 72 |
|
|
| 73 |
|
protected void setVariable(ELContext context, String name, Object value, Class<?> type) { |
| 74 |
9 |
ValueExpression valueExpression = getExpressionFactory().createValueExpression(value, type); |
| 75 |
9 |
SimpleContext simpleContext = (SimpleContext) context; |
| 76 |
9 |
simpleContext.setVariable(name, valueExpression); |
| 77 |
9 |
} |
| 78 |
|
|
| 79 |
|
|
| 80 |
|
|
| 81 |
|
|
| 82 |
|
protected ELContext createContext() { |
| 83 |
3 |
return new SimpleContext(); |
| 84 |
|
} |
| 85 |
|
|
| 86 |
|
protected String assertionFailureMessage(Exchange exchange) { |
| 87 |
0 |
return expression; |
| 88 |
|
} |
| 89 |
|
} |