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LocaleTypeDescriptor.java
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LocaleTypeDescriptor.java
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/*
* 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.util.Comparator;
import java.util.Locale;
import org.hibernate.type.descriptor.WrapperOptions;
/**
* Descriptor for {@link Locale} handling.
*
* @author Steve Ebersole
*/
public class LocaleTypeDescriptor extends AbstractTypeDescriptor<Locale> {
public static final LocaleTypeDescriptor INSTANCE = new LocaleTypeDescriptor();
public static class LocaleComparator implements Comparator<Locale> {
public static final LocaleComparator INSTANCE = new LocaleComparator();
public int compare(Locale o1, Locale o2) {
return o1.toString().compareTo( o2.toString() );
}
}
public LocaleTypeDescriptor() {
super( Locale.class );
}
@Override
public Comparator<Locale> getComparator() {
return LocaleComparator.INSTANCE;
}
public String toString(Locale value) {
return value.toString();
}
public Locale fromString(String string) {
// TODO : Ultimately switch to Locale.Builder for this. However, Locale.Builder is Java 7
if ( string == null || string.isEmpty() ) {
return null;
}
boolean separatorFound = false;
int position = 0;
char[] chars = string.toCharArray();
for ( int i = 0; i < chars.length; i++ ) {
// We just look for separators
if ( chars[i] == '_' ) {
if ( !separatorFound ) {
// On the first separator we know that we have at least a language
string = new String( chars, position, i - position );
position = i + 1;
}
else {
// On the second separator we have to check whether there are more chars available for variant
if ( chars.length > i + 1 ) {
// There is a variant so add it to the constructor
return new Locale( string, new String( chars, position, i - position ), new String( chars,
i + 1, chars.length - i - 1 ) );
}
else {
// No variant given, we just have language and country
return new Locale( string, new String( chars, position, i - position ), "" );
}
}
separatorFound = true;
}
}
if ( !separatorFound ) {
// No separator found, there is only a language
return new Locale( string );
}
else {
// Only one separator found, there is a language and a country
return new Locale( string, new String( chars, position, chars.length - position ) );
}
}
@SuppressWarnings({ "unchecked" })
public <X> X unwrap(Locale value, Class<X> type, WrapperOptions options) {
if ( value == null ) {
return null;
}
if ( String.class.isAssignableFrom( type ) ) {
return (X) value.toString();
}
throw unknownUnwrap( type );
}
public <X> Locale wrap(X value, WrapperOptions options) {
if ( value == null ) {
return null;
}
if ( String.class.isInstance( value ) ) {
return fromString( (String) value );
}
throw unknownWrap( value.getClass() );
}
}