/* 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.activiti.engine.impl.el;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.impl.Condition;
/**
* {@link Condition} that resolves an UEL expression at runtime.
*
* @author Joram Barrez
* @author Frederik Heremans
*/
public class UelExpressionCondition implements Condition {
protected Expression expression;
public UelExpressionCondition(Expression expression) {
this.expression = expression;
}
public boolean evaluate(DelegateExecution execution) {
Object result = expression.getValue(execution);
if (result==null) {
throw new ActivitiException("condition expression returns null");
}
if (! (result instanceof Boolean)) {
throw new ActivitiException("condition expression returns non-Boolean: "+result+" ("+result.getClass().getName()+")");
}
return (Boolean) result;
}
}