org.hibernate.property.PropertyAccessorFactory Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
* third-party contributors as indicated by either @author tags or express
* copyright attribution statements applied by the authors. All
* third-party contributions are distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.property;
import java.util.Map;
import org.hibernate.EntityMode;
import org.hibernate.MappingException;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.mapping.Property;
import org.hibernate.metamodel.binding.AttributeBinding;
/**
* A factory for building/retrieving PropertyAccessor instances.
*
* @author Gavin King
* @author Steve Ebersole
*/
public final class PropertyAccessorFactory {
private static final PropertyAccessor BASIC_PROPERTY_ACCESSOR = new BasicPropertyAccessor();
private static final PropertyAccessor DIRECT_PROPERTY_ACCESSOR = new DirectPropertyAccessor();
private static final PropertyAccessor MAP_ACCESSOR = new MapAccessor();
private static final PropertyAccessor NOOP_ACCESSOR = new NoopAccessor();
private static final PropertyAccessor EMBEDDED_PROPERTY_ACCESSOR = new EmbeddedPropertyAccessor();
//TODO: ideally we need the construction of PropertyAccessor to take the following:
// 1) EntityMode
// 2) EntityMode-specific data (i.e., the classname for pojo entities)
// 3) Property-specific data based on the EntityMode (i.e., property-name or dom4j-node-name)
// The easiest way, with the introduction of the new runtime-metamodel classes, would be the
// the following predicates:
// 1) PropertyAccessorFactory.getPropertyAccessor() takes references to both a
// org.hibernate.metadata.EntityModeMetadata and org.hibernate.metadata.Property
// 2) What is now termed a "PropertyAccessor" stores any values needed from those two
// pieces of information
// 3) Code can then simply call PropertyAccess.getGetter() with no parameters; likewise with
// PropertyAccessor.getSetter()
/**
* Retrieves a PropertyAccessor instance based on the given property definition and
* entity mode.
*
* @param property The property for which to retrieve an accessor.
* @param mode The mode for the resulting entity.
* @return An appropriate accessor.
* @throws MappingException
*/
public static PropertyAccessor getPropertyAccessor(Property property, EntityMode mode) throws MappingException {
//TODO: this is temporary in that the end result will probably not take a Property reference per-se.
if ( null == mode || EntityMode.POJO.equals( mode ) ) {
return getPojoPropertyAccessor( property.getPropertyAccessorName() );
}
else if ( EntityMode.MAP.equals( mode ) ) {
return getDynamicMapPropertyAccessor();
}
else {
throw new MappingException( "Unknown entity mode [" + mode + "]" );
}
}
/**
* Retrieves a PropertyAccessor instance based on the given property definition and
* entity mode.
*
* @param property The property for which to retrieve an accessor.
* @param mode The mode for the resulting entity.
* @return An appropriate accessor.
* @throws MappingException
*/
public static PropertyAccessor getPropertyAccessor(AttributeBinding property, EntityMode mode) throws MappingException {
//TODO: this is temporary in that the end result will probably not take a Property reference per-se.
if ( null == mode || EntityMode.POJO.equals( mode ) ) {
return getPojoPropertyAccessor( property.getPropertyAccessorName() );
}
else if ( EntityMode.MAP.equals( mode ) ) {
return getDynamicMapPropertyAccessor();
}
else {
throw new MappingException( "Unknown entity mode [" + mode + "]" );
}
}
/**
* Retreives a PropertyAccessor specific for a PojoRepresentation with the given access strategy.
*
* @param pojoAccessorStrategy The access strategy.
* @return An appropriate accessor.
*/
private static PropertyAccessor getPojoPropertyAccessor(String pojoAccessorStrategy) {
if ( StringHelper.isEmpty( pojoAccessorStrategy ) || "property".equals( pojoAccessorStrategy ) ) {
return BASIC_PROPERTY_ACCESSOR;
}
else if ( "field".equals( pojoAccessorStrategy ) ) {
return DIRECT_PROPERTY_ACCESSOR;
}
else if ( "embedded".equals( pojoAccessorStrategy ) ) {
return EMBEDDED_PROPERTY_ACCESSOR;
}
else if ( "noop".equals(pojoAccessorStrategy) ) {
return NOOP_ACCESSOR;
}
else {
return resolveCustomAccessor( pojoAccessorStrategy );
}
}
public static PropertyAccessor getDynamicMapPropertyAccessor() throws MappingException {
return MAP_ACCESSOR;
}
private static PropertyAccessor resolveCustomAccessor(String accessorName) {
Class accessorClass;
try {
accessorClass = ReflectHelper.classForName( accessorName );
}
catch (ClassNotFoundException cnfe) {
throw new MappingException("could not find PropertyAccessor class: " + accessorName, cnfe);
}
try {
return (PropertyAccessor) accessorClass.newInstance();
}
catch (Exception e) {
throw new MappingException("could not instantiate PropertyAccessor class: " + accessorName, e);
}
}
private PropertyAccessorFactory() {}
// todo : this eventually needs to be removed
public static PropertyAccessor getPropertyAccessor(Class optionalClass, String type) throws MappingException {
if ( type==null ) type = optionalClass==null || optionalClass==Map.class ? "map" : "property";
return getPropertyAccessor(type);
}
// todo : this eventually needs to be removed
public static PropertyAccessor getPropertyAccessor(String type) throws MappingException {
if ( type==null || "property".equals(type) ) return BASIC_PROPERTY_ACCESSOR;
if ( "field".equals(type) ) return DIRECT_PROPERTY_ACCESSOR;
if ( "map".equals(type) ) return MAP_ACCESSOR;
if ( "embedded".equals(type) ) return EMBEDDED_PROPERTY_ACCESSOR;
if ( "noop".equals(type)) return NOOP_ACCESSOR;
return resolveCustomAccessor(type);
}
}