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/*
*
* 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.qpid.server.model;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public abstract class Model
{
<X extends ConfiguredObject<X>> Collection<X> getReachableObjects(final ConfiguredObject<?> object,
final Class<X> clazz)
{
Class<? extends ConfiguredObject> category = ConfiguredObjectTypeRegistry.getCategory(object.getClass());
Class<? extends ConfiguredObject> ancestorClass = getAncestorClassWithGivenDescendant(category, clazz);
if(ancestorClass != null)
{
ConfiguredObject ancestor = getAncestor(ancestorClass, category, object);
if(ancestor != null)
{
return getAllDescendants(ancestor, ancestorClass, clazz);
}
}
return null;
}
<X extends ConfiguredObject<X>> Collection<X> getAllDescendants(final ConfiguredObject ancestor,
final Class<? extends ConfiguredObject> ancestorClass,
final Class<X> clazz)
{
Set<X> descendants = new HashSet<X>();
for(Class<? extends ConfiguredObject> childClass : getChildTypes(ancestorClass))
{
Collection<? extends ConfiguredObject> children = ancestor.getChildren(childClass);
if(childClass == clazz)
{
if(children != null)
{
descendants.addAll((Collection<X>)children);
}
}
else
{
if(children != null)
{
for(ConfiguredObject child : children)
{
descendants.addAll(getAllDescendants(child, childClass, clazz));
}
}
}
}
return descendants;
}
<C extends ConfiguredObject> C getAncestor(final Class<C> ancestorClass,
final Class<? extends ConfiguredObject> category,
final ConfiguredObject<?> object)
{
if(ancestorClass.isInstance(object))
{
return (C) object;
}
else
{
for(Class<? extends ConfiguredObject> parentClass : object.getModel().getParentTypes(category))
{
ConfiguredObject<?> parent = object.getParent(parentClass);
ConfiguredObject<?> ancestor = getAncestor(ancestorClass, parentClass, parent);
if(ancestor != null)
{
return (C) ancestor;
}
}
}
return null;
}
public Class<? extends ConfiguredObject> getAncestorClassWithGivenDescendant(
final Class<? extends ConfiguredObject> category,
final Class<? extends ConfiguredObject> descendantClass)
{
Collection<Class<? extends ConfiguredObject>> candidateClasses =
Collections.<Class<? extends ConfiguredObject>>singleton(category);
while(!candidateClasses.isEmpty())
{
for(Class<? extends ConfiguredObject> candidate : candidateClasses)
{
if(hasDescendant(candidate, descendantClass))
{
return candidate;
}
}
Set<Class<? extends ConfiguredObject>> previous = new HashSet<>(candidateClasses);
candidateClasses = new HashSet<>();
for(Class<? extends ConfiguredObject> prev : previous)
{
candidateClasses.addAll(getParentTypes(prev));
}
}
return null;
}
private boolean hasDescendant(final Class<? extends ConfiguredObject> candidate,
final Class<? extends ConfiguredObject> descendantClass)
{
int oldSize = 0;
Set<Class<? extends ConfiguredObject>> allDescendants = new HashSet<>(getChildTypes(candidate));
while(allDescendants.size() > oldSize)
{
oldSize = allDescendants.size();
Set<Class<? extends ConfiguredObject>> prev = new HashSet<>(allDescendants);
for(Class<? extends ConfiguredObject> clazz : prev)
{
allDescendants.addAll(getChildTypes(clazz));
}
if(allDescendants.contains(descendantClass))
{
break;
}
}
return allDescendants.contains(descendantClass);
}
public abstract Collection<Class<? extends ConfiguredObject>> getSupportedCategories();
public abstract Collection<Class<? extends ConfiguredObject>> getChildTypes(Class<? extends ConfiguredObject> parent);
public abstract Class<? extends ConfiguredObject> getRootCategory();
public abstract Collection<Class<? extends ConfiguredObject>> getParentTypes(Class<? extends ConfiguredObject> child);
public abstract int getMajorVersion();
public abstract int getMinorVersion();
public abstract ConfiguredObjectFactory getObjectFactory();
public abstract ConfiguredObjectTypeRegistry getTypeRegistry();
}
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