org.hibernate.property.access.internal.PropertyAccessStrategyBackRefImpl Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.property.access.internal;
import java.io.Serializable;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Map;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.property.access.spi.Getter;
import org.hibernate.property.access.spi.PropertyAccess;
import org.hibernate.property.access.spi.PropertyAccessStrategy;
import org.hibernate.property.access.spi.Setter;
/**
* @author Gavin King
* @author Steve Ebersole
*/
public class PropertyAccessStrategyBackRefImpl implements PropertyAccessStrategy {
/**
* A placeholder for a property value, indicating that
* we don't know the value of the back reference
*/
public static final Serializable UNKNOWN = new Serializable() {
@Override
public String toString() {
return "";
}
public Object readResolve() {
return UNKNOWN;
}
};
private final String entityName;
private final String propertyName;
public PropertyAccessStrategyBackRefImpl(String collectionRole, String entityName) {
this.entityName = entityName;
this.propertyName = collectionRole.substring( entityName.length() + 1 );
}
@Override
public PropertyAccess buildPropertyAccess(Class containerJavaType, String propertyName) {
return new PropertyAccessBackRefImpl( this );
}
private static class PropertyAccessBackRefImpl implements PropertyAccess {
private PropertyAccessStrategyBackRefImpl strategy;
private final GetterImpl getter;
public PropertyAccessBackRefImpl(PropertyAccessStrategyBackRefImpl strategy) {
this.strategy = strategy;
this.getter = new GetterImpl( strategy.entityName, strategy.propertyName );
}
@Override
public PropertyAccessStrategy getPropertyAccessStrategy() {
return strategy;
}
@Override
public Getter getGetter() {
return getter;
}
@Override
public Setter getSetter() {
return SetterImpl.INSTANCE;
}
}
private static class GetterImpl implements Getter {
private final String entityName;
private final String propertyName;
public GetterImpl(String entityName, String propertyName) {
this.entityName = entityName;
this.propertyName = propertyName;
}
@Override
public Object get(Object owner) {
return UNKNOWN;
}
@Override
public Object getForInsert(Object owner, Map mergeMap, SharedSessionContractImplementor session) {
if ( session == null ) {
return UNKNOWN;
}
else {
return session.getPersistenceContext().getOwnerId( entityName, propertyName, owner, mergeMap );
}
}
@Override
public Class getReturnType() {
return Object.class;
}
@Override
public Member getMember() {
return null;
}
@Override
public String getMethodName() {
return null;
}
@Override
public Method getMethod() {
return null;
}
}
private static class SetterImpl implements Setter {
/**
* Singleton access
*/
public static final SetterImpl INSTANCE = new SetterImpl();
@Override
public void set(Object target, Object value, SessionFactoryImplementor factory) {
// this page intentionally left blank :)
}
@Override
public String getMethodName() {
return null;
}
@Override
public Method getMethod() {
return null;
}
}
}