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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.converter;
import org.databene.commons.CollectionUtil;
import org.databene.commons.ConversionException;
import java.util.Collection;
import java.util.List;
/**
* Converts arrays and collections to collections of same content, everything else is converted to a collection of size 1.
*
* Created: 26.08.2007 16:16:15
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public class ToCollectionConverter extends ThreadSafeConverter {
public ToCollectionConverter() {
this((Class) List.class);
}
public ToCollectionConverter(Class targetType) {
super(Object.class, targetType);
}
@Override
public C convert(Object sourceValue) throws ConversionException {
return (C) convert(sourceValue, targetType);
}
public static Collection convert(Object sourceValue, Class targetType) {
if (sourceValue == null)
return null;
if (sourceValue.getClass() == targetType)
return (Collection) sourceValue;
Collection collection = CollectionUtil.newInstance(targetType);
if (sourceValue instanceof Collection)
collection.addAll((Collection) sourceValue);
else if (sourceValue.getClass().isArray()) {
Object[] array = (Object[]) sourceValue;
for (Object o : array)
collection.add(o);
} else
collection.add(sourceValue);
return collection;
}
}