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EntityLifecycleListenerManager.java
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EntityLifecycleListenerManager.java
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package cz.cvut.kbss.jopa.model.metamodel;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.model.lifecycle.LifecycleEvent;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.*;
public class EntityLifecycleListenerManager {
private static final EntityLifecycleListenerManager EMPTY = new EntityLifecycleListenerManager();
private EntityLifecycleListenerManager parent;
private final Map<LifecycleEvent, Method> lifecycleCallbacks = new EnumMap<>(LifecycleEvent.class);
private List<Object> entityListeners;
private Map<Object, Map<LifecycleEvent, Method>> entityListenerCallbacks;
/**
* Gets default instance of this manager, which contains no listeners and does nothing on invocation.
*
* @return Default {@link EntityLifecycleListenerManager} instance
*/
public static EntityLifecycleListenerManager empty() {
return EMPTY;
}
/**
* Calls pre-persist listeners for the specified instance.
*
* @param instance The instance for persist
*/
public void invokePrePersistListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.PRE_PERSIST);
}
private void invokeListeners(Object instance, LifecycleEvent lifecycleEvent) {
if (lifecycleCallbacks.containsKey(lifecycleEvent)) {
final Method listener = lifecycleCallbacks.get(lifecycleEvent);
if (!listener.isAccessible()) {
listener.setAccessible(true);
}
try {
listener.invoke(instance);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new OWLPersistenceException("Unable to invoke method lifecycle listener " + listener, e);
}
}
if (parent != null) {
parent.invokeListeners(instance, lifecycleEvent);
}
}
/**
* Calls pre-remove listeners for the specified instance.
*
* @param instance The instance for removal
*/
public void invokePreRemoveListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.PRE_REMOVE);
}
/**
* Calls post-persist listeners for the specified instance.
*
* @param instance The newly persisted instance
*/
public void invokePostPersistListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.POST_PERSIST);
}
/**
* Calls post-remove listeners for the specified instance.
*
* @param instance The removed instance
*/
public void invokePostRemoveListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.POST_REMOVE);
}
/**
* Calls post-load listeners for the specified instance.
*
* @param instance The loaded instance
*/
public void invokePostLoadListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.POST_LOAD);
}
/**
* Calls pre-update listeners for the specified instance.
*
* @param instance The updated instance
*/
public void invokePreUpdateListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.PRE_UPDATE);
}
/**
* Calls post-update listeners for the specified instance.
*
* @param instance The updated instance
*/
public void invokePostUpdateListeners(Object instance) {
invokeListeners(instance, LifecycleEvent.POST_UPDATE);
}
public void setParent(EntityLifecycleListenerManager parent) {
this.parent = parent;
}
public void addEntityListener(Object entityListener) {
Objects.requireNonNull(entityListener);
if (entityListeners == null) {
this.entityListeners = new ArrayList<>();
}
entityListeners.add(entityListener);
}
public void addLifecycleCallback(LifecycleEvent event, Method callback) {
assert event != null;
assert callback != null;
lifecycleCallbacks.put(event, callback);
}
public Map<LifecycleEvent, Method> getLifecycleCallbacks() {
return Collections.unmodifiableMap(lifecycleCallbacks);
}
public boolean hasLifecycleCallback(LifecycleEvent event) {
return lifecycleCallbacks.containsKey(event);
}
List<Object> getEntityListeners() {
return entityListeners != null ? Collections.unmodifiableList(entityListeners) : Collections.emptyList();
}
Map<Object, Map<LifecycleEvent, Method>> getEntityListenerCallbacks() {
return Collections.unmodifiableMap(entityListenerCallbacks);
}
}