/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.openejb.util;
import org.apache.openejb.OpenEJBRuntimeException;
import org.apache.xbean.recipe.ObjectRecipe;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
public final class ListConfigurator {
private ListConfigurator() {
// no-op
}
public static <T> List<T> getList(final Properties properties, final String key, final ClassLoader classloader, final Class<T> filter) {
if (properties == null) {
return null;
}
final String features = properties.getProperty(key);
if (features == null) {
return null;
}
final List<T> list = new ArrayList<T>();
final String[] split = features.trim().split(",");
for (final String feature : split) {
if (feature == null || feature.trim().isEmpty()) {
continue;
}
final String prefix = key + "." + feature + ".";
final ObjectRecipe recipe = new ObjectRecipe(feature);
for (final Map.Entry<Object, Object> entry : properties.entrySet()) {
final String current = entry.getKey().toString();
if (current.startsWith(prefix)) {
final String property = current.substring(prefix.length());
recipe.setProperty(property, entry.getValue());
}
}
final Object instance = recipe.create(classloader);
if (!filter.isInstance(instance)) {
throw new OpenEJBRuntimeException(feature + " is not an abstract feature");
}
list.add(filter.cast(instance));
}
if (list.isEmpty()) {
return null;
}
return list;
}
}