/* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.camunda.bpm.engine.impl.el;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.delegate.VariableScope;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.delegate.ExpressionGetInvocation;
import org.camunda.bpm.engine.impl.delegate.ExpressionSetInvocation;
import org.camunda.bpm.engine.impl.javax.el.ELContext;
import org.camunda.bpm.engine.impl.javax.el.ELException;
import org.camunda.bpm.engine.impl.javax.el.MethodNotFoundException;
import org.camunda.bpm.engine.impl.javax.el.PropertyNotFoundException;
import org.camunda.bpm.engine.impl.javax.el.ValueExpression;
/**
* Expression implementation backed by a JUEL {@link ValueExpression}.
*
* @author Frederik Heremans
* @author Joram Barrez
*/
public class JuelExpression implements Expression {
protected String expressionText;
protected ValueExpression valueExpression;
protected ExpressionManager expressionManager;
public JuelExpression(ValueExpression valueExpression, ExpressionManager expressionManager, String expressionText) {
this.valueExpression = valueExpression;
this.expressionManager = expressionManager;
this.expressionText = expressionText;
}
public Object getValue(VariableScope<?> variableScope) {
ELContext elContext = expressionManager.getElContext(variableScope);
try {
ExpressionGetInvocation invocation = new ExpressionGetInvocation(valueExpression, elContext);
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(invocation);
return invocation.getInvocationResult();
} catch (PropertyNotFoundException pnfe) {
throw new ProcessEngineException("Unknown property used in expression: " + expressionText+". Cause: "+pnfe.getMessage(), pnfe);
} catch (MethodNotFoundException mnfe) {
throw new ProcessEngineException("Unknown method used in expression: " + expressionText+". Cause: "+mnfe.getMessage(), mnfe);
} catch(ELException ele) {
throw new ProcessEngineException("Error while evaluating expression: " + expressionText+". Cause: "+ele.getMessage(), ele);
} catch (Exception e) {
throw new ProcessEngineException("Error while evaluating expression: " + expressionText+". Cause: "+e.getMessage(), e);
}
}
public void setValue(Object value, VariableScope<?> variableScope) {
ELContext elContext = expressionManager.getElContext(variableScope);
try {
ExpressionSetInvocation invocation = new ExpressionSetInvocation(valueExpression, elContext, value);
Context.getProcessEngineConfiguration()
.getDelegateInterceptor()
.handleInvocation(invocation);
} catch (Exception e) {
throw new ProcessEngineException("Error while evaluating expression: " + expressionText+". Cause: "+e.getMessage(), e);
}
}
@Override
public String toString() {
if(valueExpression != null) {
return valueExpression.getExpressionString();
}
return super.toString();
}
public String getExpressionText() {
return expressionText;
}
}