/*
* 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.isis.core.runtime.services;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.collect.Collections2;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class ServicesInstallerUtils {
private static final Logger LOG = LoggerFactory.getLogger(ServicesInstallerFromConfiguration.class);
private static final char DELIMITER = '#';
private ServicesInstallerUtils (){}
static <V extends Comparable<V>> LinkedHashSet<V> flatten(SortedMap<String, SortedSet<V>> positionedServices) {
final LinkedHashSet<V> serviceList = Sets.newLinkedHashSet();
final Set<String> keys = positionedServices.keySet();
for (String position : keys) {
final SortedSet<V> list = positionedServices.get(position);
serviceList.addAll(list);
}
return serviceList;
}
static <V> void appendInPosition(SortedMap<String, SortedSet<String>> positionedServices, String position, String service) {
if(service == null) {
return;
}
SortedSet<String> serviceList = positionedServices.get(position);
if(serviceList == null) {
serviceList = Sets.newTreeSet();
positionedServices.put(position, serviceList);
}
serviceList.add(service);
}
static Object instantiateService(String serviceName, ServiceInstantiator serviceInstantiator) {
final int pos = serviceName.indexOf(DELIMITER);
if( pos == 0) {
// a commented out line, in other words...
return null;
}
final String type;
if (pos != -1) {
type = serviceName.substring(0, pos);
// disregard, assume the stuff after the delimiter (#) was a comment
} else {
type = serviceName;
}
return serviceInstantiator.createInstance(type);
}
static List<Object> instantiateServicesFrom(SortedMap<String, SortedSet<String>> positionedServices, final ServiceInstantiator serviceInstantiator) {
LinkedHashSet<String> serviceNameList = flatten(positionedServices);
final Collection<Object> filter = Collections2.filter(
Collections2.transform(serviceNameList, instantiator(serviceInstantiator)), Predicates.notNull());
return Lists.newArrayList(filter);
}
private static Function<String, Object> instantiator(final ServiceInstantiator serviceInstantiator) {
return new Function<String, Object>() {
@Override
public Object apply(String serviceName) {
return instantiateService(serviceName, serviceInstantiator);
}
};
}
}