/*
* 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.cloudstack.spring.module.factory;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.apache.cloudstack.spring.module.model.ModuleDefinition;
import org.apache.cloudstack.spring.module.model.ModuleDefinitionSet;
import org.apache.cloudstack.spring.module.model.impl.DefaultModuleDefinitionSet;
public class ModuleBasedContextFactory {
public ModuleDefinitionSet loadModules(Collection<ModuleDefinition> defs, String root) throws IOException {
Map<String, ModuleDefinition> modules = wireUpModules(root, defs);
DefaultModuleDefinitionSet moduleSet = new DefaultModuleDefinitionSet(modules, root);
moduleSet.load();
return moduleSet;
}
protected Map<String, ModuleDefinition> wireUpModules(String root, Collection<ModuleDefinition> defs) throws IOException {
Map<String, ModuleDefinition> modules = new HashMap<String, ModuleDefinition>();
for (ModuleDefinition def : defs) {
modules.put(def.getName(), def);
}
ModuleDefinition rootDef = null;
Map<String, ModuleDefinition> result = new HashMap<String, ModuleDefinition>();
for (ModuleDefinition def : modules.values()) {
if (def.getName().equals(root)) {
rootDef = def;
}
if (def.getParentName() != null) {
ModuleDefinition parentDef = modules.get(def.getParentName());
if (parentDef != null)
parentDef.addChild(def);
}
}
return traverse(rootDef, result);
}
protected Map<String, ModuleDefinition> traverse(ModuleDefinition base, Map<String, ModuleDefinition> result) {
if (base == null)
return result;
if (result.containsKey(base.getName())) {
throw new RuntimeException("Circular dependency to [" + base.getName() + "] from current set " + result.keySet());
}
result.put(base.getName(), base);
for (ModuleDefinition childDef : base.getChildren())
traverse(childDef, result);
return result;
}
}