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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.
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/*
* Copyright (C) 2004-2015 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.ArrayUtil;
import org.databene.commons.ConversionException;
import org.databene.commons.Converter;
/**
* Converts arrays from one component type to arrays of another component type.
* If there are no converters registered, it only transforms the array type.
* If there is a single converter, all elements are converted with the same converter.
* If there are several converters, the number of converters and array elements are
* assumed to be equal and each element is converted with the converter of the same index.
* Created: 07.06.2007 14:35:18
* @param the object type to convert from
* @param the object type to convert to
* @author Volker Bergmann
*/
public class ArrayConverter extends MultiConverterWrapper implements Converter {
private Class targetComponentType;
private Class sourceType;
private Class targetType;
@SuppressWarnings("unchecked")
public ArrayConverter(Class sourceComponentType, Class targetComponentType, Converter ... converters) {
super(converters);
this.targetComponentType = targetComponentType;
this.sourceType = ArrayUtil.arrayType(sourceComponentType);
this.targetType = ArrayUtil.arrayType(targetComponentType);
}
@Override
public Class getSourceType() {
return sourceType;
}
@Override
public Class getTargetType() {
return targetType;
}
/**
* If there are no converters, it only transforms the array type;
* if there is a single converter, all elements are converted with the same converter;
* if there are several converters, the number of converters and array elements are
* assumed to be equal and each element is converted with the converter of the same index.
*/
@Override
public T[] convert(S[] sourceValues) throws ConversionException {
if (sourceValues == null)
return null;
if (components.length == 0)
return convertWith(null, targetComponentType, sourceValues);
else if (components.length == 1)
return convertWith(components[0], targetComponentType, sourceValues);
else {
if (sourceValues.length != components.length)
throw new IllegalArgumentException("Array has a different size than the converter list");
T[] result = ArrayUtil.newInstance(targetComponentType, components.length);
for (int i = 0; i < components.length; i++)
result[i] = components[i].convert(sourceValues[i]);
return result;
}
}
/** Converts all array elements with the same {@link Converter}.
* @param converter the converter to apply
* @param componentType the component type of the result array
* @param sourceValues the source values to convert
* @return an array with the mapped values
* @param the object type to convert from
* @param the object type to convert to
* @throws ConversionException if conversion fails */
public static T[] convertWith(Converter converter, Class componentType, S[] sourceValues) throws ConversionException {
T[] result = ArrayUtil.newInstance(componentType, sourceValues.length);
for (int i = 0; i < sourceValues.length; i++) {
Object tmp = (converter != null ? converter.convert(sourceValues[i]) : sourceValues[i]);
result[i] = AnyConverter.convert(tmp, componentType);
}
return result;
}
}