org.camunda.bpm.application.ProcessApplicationElResolver Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.application;
import java.util.Comparator;
import java.util.ServiceLoader;
import org.camunda.bpm.impl.juel.jakarta.el.ELResolver;
/**
* SPI interface that allows providing a custom ElResolver implementation.
*
* Implementations of this interface are looked up through the Java SE {@link ServiceLoader} facilities.
* If you want to provide a custom implementation in your application, place a file named
* META-INF/org.camunda.bpm.application.ProcessApplicationElResolver inside your application
* which contains the fully qualified classname of your implementation.
*
* @author Daniel Meyer
*
*/
public interface ProcessApplicationElResolver {
// precedences for known providers
static int SPRING_RESOLVER = 100;
static int CDI_RESOLVER = 200;
/**
* Allows to set a precedence to the ElResolver. Resolver with a lower precedence will be invoked first.
*/
Integer getPrecedence();
/**
* return the Resolver. May be null.
*/
ELResolver getElResolver(AbstractProcessApplication processApplication);
/**
* Comparator used for sorting providers
*
* @see ProcessApplicationElResolver#getPrecedence()
*/
public static class ProcessApplicationElResolverSorter implements Comparator {
public int compare(ProcessApplicationElResolver o1, ProcessApplicationElResolver o2) {
return (-1) * o1.getPrecedence().compareTo(o2.getPrecedence());
}
}
}