/*
* Hibernate Search, full-text search for your domain model
*
* 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.search.query.fieldcache.impl;
import org.hibernate.search.bridge.builtin.NumericFieldBridge;
import org.hibernate.search.bridge.builtin.impl.NullEncodingTwoWayFieldBridge;
import org.hibernate.search.bridge.TwoWayFieldBridge;
import org.hibernate.search.bridge.builtin.impl.TwoWayString2FieldBridgeAdaptor;
import org.hibernate.search.bridge.TwoWayStringBridge;
/**
* A {@code FieldCacheCollectorFactory} requires two parameters which are inferred from
* the type of field and its 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 final class ClassLoadingStrategySelector {
private ClassLoadingStrategySelector() {
//not allowed
}
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 NumericFieldBridge ) {
return ((NumericFieldBridge) fieldBridge ).getFieldCacheLoadingType();
}
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;
}
}
}