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LazyAttributeLoader.java
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LazyAttributeLoader.java
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/*
* 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.bytecode.enhance.spi.interceptor;
import java.util.Set;
import org.hibernate.LazyInitializationException;
import org.hibernate.bytecode.enhance.internal.tracker.SimpleDirtyTracker;
import org.hibernate.bytecode.instrumentation.spi.LazyPropertyInitializer;
import org.hibernate.engine.spi.PersistentAttributeInterceptor;
import org.hibernate.engine.spi.SessionImplementor;
/**
* Interceptor that loads attributes lazily
*
* @author Luis Barreiro
*/
public class LazyAttributeLoader implements PersistentAttributeInterceptor {
private final transient SessionImplementor session;
private final Set<String> lazyFields;
private final String entityName;
private final SimpleDirtyTracker initializedFields = new SimpleDirtyTracker();
public LazyAttributeLoader(SessionImplementor session, Set<String> lazyFields, String entityName) {
this.session = session;
this.lazyFields = lazyFields;
this.entityName = entityName;
}
protected final Object intercept(Object target, String fieldName, Object value) {
if ( lazyFields != null && lazyFields.contains( fieldName ) && !initializedFields.contains( fieldName ) ) {
if ( session == null ) {
throw new LazyInitializationException( "entity with lazy properties is not associated with a session" );
}
else if ( !session.isOpen() || !session.isConnected() ) {
throw new LazyInitializationException( "session is not connected" );
}
Object loadedValue = ( (LazyPropertyInitializer) session.getFactory()
.getEntityPersister( entityName ) ).initializeLazyProperty(
fieldName,
target,
session
);
initializedFields.add( fieldName );
return loadedValue;
}
else {
return value;
}
}
@Override
public String toString() {
return "LazyAttributeLoader(entityName=" + entityName + " ,lazyFields=" + lazyFields + ')';
}
/* --- */
@Override
public boolean readBoolean(Object obj, String name, boolean oldValue) {
return (Boolean) intercept( obj, name, oldValue );
}
@Override
public boolean writeBoolean(Object obj, String name, boolean oldValue, boolean newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public byte readByte(Object obj, String name, byte oldValue) {
return (Byte) intercept( obj, name, oldValue );
}
@Override
public byte writeByte(Object obj, String name, byte oldValue, byte newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public char readChar(Object obj, String name, char oldValue) {
return (Character) intercept( obj, name, oldValue );
}
@Override
public char writeChar(Object obj, String name, char oldValue, char newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public short readShort(Object obj, String name, short oldValue) {
return (Short) intercept( obj, name, oldValue );
}
@Override
public short writeShort(Object obj, String name, short oldValue, short newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public int readInt(Object obj, String name, int oldValue) {
return (Integer) intercept( obj, name, oldValue );
}
@Override
public int writeInt(Object obj, String name, int oldValue, int newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public float readFloat(Object obj, String name, float oldValue) {
return (Float) intercept( obj, name, oldValue );
}
@Override
public float writeFloat(Object obj, String name, float oldValue, float newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public double readDouble(Object obj, String name, double oldValue) {
return (Double) intercept( obj, name, oldValue );
}
@Override
public double writeDouble(Object obj, String name, double oldValue, double newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public long readLong(Object obj, String name, long oldValue) {
return (Long) intercept( obj, name, oldValue );
}
@Override
public long writeLong(Object obj, String name, long oldValue, long newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
@Override
public Object readObject(Object obj, String name, Object oldValue) {
return intercept( obj, name, oldValue );
}
@Override
public Object writeObject(Object obj, String name, Object oldValue, Object newValue) {
if ( lazyFields != null && lazyFields.contains( name ) ) {
initializedFields.add( name );
}
return newValue;
}
}