| /* |
| * |
| * 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.ArrayList; |
| 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; |
| } |
| |
| public <C> C getAncestor(final Class<C> ancestorClass, |
| final ConfiguredObject<?> object) |
| { |
| return getAncestor(ancestorClass, object.getCategoryClass(), object); |
| } |
| |
| public <C> 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 : getParentTypes(category)) |
| { |
| ConfiguredObject<?> parent = object.getParent(parentClass); |
| C ancestor = getAncestor(ancestorClass, parentClass, parent); |
| if(ancestor != null) |
| { |
| return 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 final Collection<Class<? extends ConfiguredObject>> getDescendantCategories(Class<? extends ConfiguredObject> parent) |
| { |
| Set<Class<? extends ConfiguredObject>> allDescendants = new HashSet<>(); |
| for(Class<? extends ConfiguredObject> clazz : getChildTypes(parent)) |
| { |
| if(allDescendants.add(clazz)) |
| { |
| allDescendants.addAll(getDescendantCategories(clazz)); |
| } |
| } |
| |
| return allDescendants; |
| } |
| |
| public final Collection<Class<? extends ConfiguredObject>> getAncestorCategories(Class<? extends ConfiguredObject> category) |
| { |
| Set<Class<? extends ConfiguredObject>> allAncestors = new HashSet<>(); |
| for(Class<? extends ConfiguredObject> clazz : getParentTypes(category)) |
| { |
| if(allAncestors.add(clazz)) |
| { |
| allAncestors.addAll(getAncestorCategories(clazz)); |
| } |
| } |
| |
| return allAncestors; |
| } |
| |
| 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(); |
| |
| public static boolean isSpecialization(final Model model, |
| final Model specialization, |
| final Class<? extends ConfiguredObject> specializationPoint) |
| { |
| if(model.getSupportedCategories().contains(specializationPoint) |
| && specialization.getSupportedCategories().containsAll(model.getSupportedCategories()) |
| && model.getChildTypes(specializationPoint).isEmpty()) |
| { |
| final Collection<Class<? extends ConfiguredObject>> modelSupportedCategories = new ArrayList<>(model.getSupportedCategories()); |
| modelSupportedCategories.remove(specializationPoint); |
| for(Class<? extends ConfiguredObject> category : modelSupportedCategories) |
| { |
| if(!model.getChildTypes(category).equals(specialization.getChildTypes(category))) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| } |