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package org.apache.cayenne.map;

import java.util.HashMap;
import java.util.Map;

import org.apache.cayenne.property.ClassDescriptor;
import org.apache.cayenne.property.ClassDescriptorFactory;

/**
 * A caching descriptor factory that creates ClassDescriptors based on Cayenne mapping
 * information.
 * 

* Synchronization note: This implementation is NOT synchronized, and requires external * synchronization if used in a multi-threaded environment. *

* * @since 1.2 * @author Andrus Adamchik */ public class EntityDescriptorFactory implements ClassDescriptorFactory { protected EntityResolver resolver; protected Map classDescriptors; public EntityDescriptorFactory(EntityResolver resolver) { this.resolver = resolver; } public ClassDescriptor getDescriptor(String entityName) { if (classDescriptors == null) { classDescriptors = new HashMap(); } else { ClassDescriptor descriptor = (ClassDescriptor) classDescriptors .get(entityName); if (descriptor != null) { return descriptor; } } EntityDescriptor entityDescriptor = createDescriptor(entityName); if (entityDescriptor == null) { return null; } classDescriptors.put(entityName, entityDescriptor); // compile after caching to avoid infinite loops during ArcProperty compilation entityDescriptor.compile(resolver); return entityDescriptor; } /** * Creates a new descriptor that is not compiled. Compilation is intentionally * deferred until after the descriptor is cached, as it triggers creation of related * entity descriptors and may result in an endless loop. */ protected EntityDescriptor createDescriptor(String entityName) { ObjEntity entity = resolver.getObjEntity(entityName); if (entity == null) { return null; } String superEntityName = entity.getSuperEntityName(); ClassDescriptor superDescriptor = (superEntityName != null) ? resolver .getClassDescriptor(superEntityName) : null; // return uncompiled return new EntityDescriptor(entity, superDescriptor); } }




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