/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* 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.ogm.datastore.infinispan.dialect.impl;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collections;
import java.util.Set;
import org.hibernate.ogm.datastore.infinispan.InfinispanDialect;
import org.hibernate.ogm.datastore.infinispan.impl.InfinispanDatastoreProvider;
import org.hibernate.ogm.model.key.spi.AssociationKey;
import org.hibernate.ogm.model.key.spi.AssociationKeyMetadata;
import org.infinispan.commons.marshall.AdvancedExternalizer;
/**
* An externalizer for serializing and de-serializing {@link AssociationKey} instances. Implicitly used by
* {@link InfinispanDialect} which stores keys as is in the Infinispan data store.
* <p>
* This externalizer is automatically registered with the cache manager when starting the
* {@link InfinispanDatastoreProvider}, so it's not required to configure the externalizer in the Infinispan
* configuration file.
*
* @author Gunnar Morling
*/
// As an implementation of AdvancedExternalizer this is never serialized according to the Externalizer docs
@SuppressWarnings("serial")
public class AssociationKeyExternalizer implements AdvancedExternalizer<AssociationKey> {
public static final AssociationKeyExternalizer INSTANCE = new AssociationKeyExternalizer();
/**
* Format version of the key type; allows to apply version dependent deserialization logic in the future if
* required; to be incremented when adding new fields to the serialized structure
*/
private static final int VERSION = 1;
private static final Set<Class<? extends AssociationKey>> TYPE_CLASSES = Collections.<Class<? extends AssociationKey>>singleton( AssociationKey.class );
private AssociationKeyExternalizer() {
}
@Override
public void writeObject(ObjectOutput output, AssociationKey key) throws IOException {
output.writeInt( VERSION );
output.writeUTF( key.getTable() );
output.writeObject( key.getColumnNames() );
output.writeObject( key.getColumnValues() );
}
@Override
public AssociationKey readObject(ObjectInput input) throws IOException, ClassNotFoundException {
// version
input.readInt();
String tableName = input.readUTF();
String[] columnNames = (String[]) input.readObject();
Object[] values = (Object[]) input.readObject();
AssociationKeyMetadata associationKeyMetadata = new AssociationKeyMetadata.Builder()
.table( tableName )
.columnNames( columnNames )
.build();
// the engine never accesses deserialized key instances so it's ok to leave the additional attributes
// null; we should still consider extract these attributes to avoid potential confusion
return new AssociationKey( associationKeyMetadata, values, null );
}
@Override
public Set<Class<? extends AssociationKey>> getTypeClasses() {
return TYPE_CLASSES;
}
@Override
public Integer getId() {
return ExternalizerIds.ASSOCIATION_KEY;
}
}