/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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.jbpm.services.api.query;
import java.util.Map;
/**
* A delegate mapper that will delay look up of actual mapper to the time its
* <code>map</code> method is invoked. Especially useful for EJB remote usage when dependency
* to api only is preferred and the actual implementations will be found on server side.
*
* @param <T> the result type expected to be returned
*/
public class NamedQueryMapper<T> implements QueryResultMapper<T> {
private static final long serialVersionUID = -5975192042647431269L;
private String mapperName;
/**
* Creates new instance with actual mapper name
* @param mapperName unique name of the mapper that will be used to produce results.
*/
public NamedQueryMapper(String mapperName) {
this.mapperName = mapperName;
}
@SuppressWarnings("unchecked")
@Override
public T map(Object result) {
QueryResultMapper<T> actualMapper = (QueryResultMapper<T>) QueryMapperRegistry.get().mapperFor(mapperName, null);
return actualMapper.map(result);
}
@Override
public String getName() {
return "NamedQueryMapper";
}
@SuppressWarnings("unchecked")
@Override
public Class<?> getType() {
QueryResultMapper<T> actualMapper = (QueryResultMapper<T>) QueryMapperRegistry.get().mapperFor(mapperName, null);
return actualMapper.getType();
}
@Override
public QueryResultMapper<T> forColumnMapping(Map<String, String> columnMapping) {
return new NamedQueryMapper<T>(mapperName);
}
}