org.hibernate.type.descriptor.java.SerializableTypeDescriptor Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @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.type.descriptor.java;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Serializable;
import java.sql.Blob;
import java.sql.SQLException;
import org.hibernate.HibernateException;
import org.hibernate.engine.jdbc.BinaryStream;
import org.hibernate.engine.jdbc.internal.BinaryStreamImpl;
import org.hibernate.internal.util.SerializationHelper;
import org.hibernate.type.descriptor.WrapperOptions;
/**
* Descriptor for general {@link Serializable} handling.
*
* @author Steve Ebersole
* @author Brett meyer
*/
public class SerializableTypeDescriptor extends AbstractTypeDescriptor {
// unfortunately the param types cannot be the same so use something other than 'T' here to make that obvious
public static class SerializableMutabilityPlan extends MutableMutabilityPlan {
private final Class type;
public static final SerializableMutabilityPlan INSTANCE
= new SerializableMutabilityPlan( Serializable.class );
public SerializableMutabilityPlan(Class type) {
this.type = type;
}
@Override
@SuppressWarnings({ "unchecked" })
public S deepCopyNotNull(S value) {
return (S) SerializationHelper.clone( value );
}
}
@SuppressWarnings({ "unchecked" })
public SerializableTypeDescriptor(Class type) {
super(
type,
Serializable.class.equals( type )
? (MutabilityPlan) SerializableMutabilityPlan.INSTANCE
: new SerializableMutabilityPlan( type )
);
}
public String toString(T value) {
return PrimitiveByteArrayTypeDescriptor.INSTANCE.toString( toBytes( value ) );
}
public T fromString(String string) {
return fromBytes( PrimitiveByteArrayTypeDescriptor.INSTANCE.fromString( string ) );
}
@Override
public boolean areEqual(T one, T another) {
if ( one == another ) {
return true;
}
if ( one == null || another == null ) {
return false;
}
return one.equals( another )
|| PrimitiveByteArrayTypeDescriptor.INSTANCE.areEqual( toBytes( one ), toBytes( another ) );
}
@Override
public int extractHashCode(T value) {
return PrimitiveByteArrayTypeDescriptor.INSTANCE.extractHashCode( toBytes( value ) );
}
@SuppressWarnings({ "unchecked" })
public X unwrap(T value, Class type, WrapperOptions options) {
if ( value == null ) {
return null;
}
else if ( type.isInstance( value ) ) {
return (X) value;
}
else if ( byte[].class.isAssignableFrom( type ) ) {
return (X) toBytes( value );
}
else if ( InputStream.class.isAssignableFrom( type ) ) {
return (X) new ByteArrayInputStream( toBytes( value ) );
}
else if ( BinaryStream.class.isAssignableFrom( type ) ) {
return (X) new BinaryStreamImpl( toBytes( value ) );
}
else if ( Blob.class.isAssignableFrom( type )) {
return (X) options.getLobCreator().createBlob( toBytes(value) );
}
throw unknownUnwrap( type );
}
@SuppressWarnings("unchecked")
public T wrap(X value, WrapperOptions options) {
if ( value == null ) {
return null;
}
else if ( byte[].class.isInstance( value ) ) {
return fromBytes( (byte[]) value );
}
else if ( InputStream.class.isInstance( value ) ) {
return fromBytes( DataHelper.extractBytes( (InputStream) value ) );
}
else if ( Blob.class.isInstance( value )) {
try {
return fromBytes( DataHelper.extractBytes( ( (Blob) value ).getBinaryStream() ) );
}
catch ( SQLException e ) {
throw new HibernateException(e);
}
}
else if ( getJavaTypeClass().isInstance( value ) ) {
return (T) value;
}
throw unknownWrap( value.getClass() );
}
protected byte[] toBytes(T value) {
return SerializationHelper.serialize( value );
}
@SuppressWarnings({ "unchecked" })
protected T fromBytes(byte[] bytes) {
return (T) SerializationHelper.deserialize( bytes, getJavaTypeClass().getClassLoader() );
}
}