/* 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.application.ProcessApplicationInterface;
import org.camunda.bpm.application.ProcessApplicationReference;
import org.camunda.bpm.application.ProcessApplicationUnavailableException;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.javax.el.BeanELResolver;
import org.camunda.bpm.engine.impl.javax.el.ELResolver;
/**
* <p>Resolves a {@link BeanELResolver} from the current process application.
* This allows to cache resolvers on the process application level. Such a resolver
* cannot be cached globally as {@link BeanELResolver} keeps a cache of classes
* involved in expressions.</p>
*
* <p>If resolution is attempted outside the context of a process application,
* then always a new resolver instance is returned (i.e. no caching in these cases).</p>
*
* @author Thorben Lindhauer
*/
public class ProcessApplicationBeanElResolverDelegate extends AbstractElResolverDelegate {
protected ELResolver getElResolverDelegate() {
ProcessApplicationReference processApplicationReference = Context.getCurrentProcessApplication();
if(processApplicationReference != null) {
try {
ProcessApplicationInterface processApplication = processApplicationReference.getProcessApplication();
return processApplication.getBeanElResolver();
} catch (ProcessApplicationUnavailableException e) {
throw new ProcessEngineException("Cannot access process application '"+processApplicationReference.getName()+"'", e);
}
} else {
return new BeanELResolver();
}
}
}