/*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* 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,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.search.query.fieldcache;
import org.hibernate.search.bridge.NullEncodingTwoWayFieldBridge;
import org.hibernate.search.bridge.TwoWayFieldBridge;
import org.hibernate.search.bridge.TwoWayString2FieldBridgeAdaptor;
import org.hibernate.search.bridge.TwoWayStringBridge;
import org.hibernate.search.bridge.builtin.DoubleNumericFieldBridge;
import org.hibernate.search.bridge.builtin.FloatNumericFieldBridge;
import org.hibernate.search.bridge.builtin.IntegerNumericFieldBridge;
import org.hibernate.search.bridge.builtin.LongNumericFieldBridge;
/**
* A {@code FieldCacheCollectorFactory} requires two parameters which are inferred from
* the type of field and it's applied bridges. Not all cases can be covered.
* This class contains helpers to extract the proper parameters to create such a factory.
*
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2011 Red Hat Inc.
*/
public class ClassLoadingStrategySelector {
public static FieldCacheLoadingType guessAppropriateCollectorType(TwoWayFieldBridge fieldBridge) {
if ( fieldBridge instanceof NullEncodingTwoWayFieldBridge ) {
NullEncodingTwoWayFieldBridge encoding = (NullEncodingTwoWayFieldBridge) fieldBridge;
return guessAppropriateCollectorType( encoding.unwrap() );
}
else if ( fieldBridge instanceof TwoWayString2FieldBridgeAdaptor ) {
return FieldCacheLoadingType.STRING;
}
else if ( fieldBridge instanceof IntegerNumericFieldBridge ) {
return FieldCacheLoadingType.INT;
}
else if ( fieldBridge instanceof LongNumericFieldBridge ) {
return FieldCacheLoadingType.LONG;
}
else if ( fieldBridge instanceof DoubleNumericFieldBridge ) {
return FieldCacheLoadingType.DOUBLE;
}
else if ( fieldBridge instanceof FloatNumericFieldBridge ) {
return FieldCacheLoadingType.FLOAT;
}
else {
// we don't know how to extract this: no fieldCache will be available
return null;
}
}
/**
* Extracts (if possible) the two way string bridge from a given two way field bridge
*
* @param fieldBridge the field bridge from which to extract (unwrap) the two way string bridge
*
* @return the underlying string bridge or {@code null} if we can't extract it
*/
public static TwoWayStringBridge getTwoWayStringBridge(TwoWayFieldBridge fieldBridge) {
if ( fieldBridge instanceof NullEncodingTwoWayFieldBridge ) {
NullEncodingTwoWayFieldBridge encoding = (NullEncodingTwoWayFieldBridge) fieldBridge;
return getTwoWayStringBridge( encoding.unwrap() );
}
else if ( fieldBridge instanceof TwoWayString2FieldBridgeAdaptor ) {
TwoWayString2FieldBridgeAdaptor adaptor = (TwoWayString2FieldBridgeAdaptor) fieldBridge;
return adaptor.unwrap();
}
else {
return null;
}
}
}