org.databene.commons.bean.ArrayPropertyExtractor Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of databene-commons Show documentation
Show all versions of databene-commons Show documentation
'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) 2004-2015 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.bean;
import org.databene.commons.ArrayUtil;
import org.databene.commons.ConversionException;
import org.databene.commons.converter.ThreadSafeConverter;
import org.databene.commons.converter.AnyConverter;
/**
* Extracts property values from an array of JavaBeans in a way that
* processing n beans results in an array of n elements with the property values.
* @param the bean type to access
* Created: 02.08.2007 20:47:35
* @author Volker Bergmann
*/
public class ArrayPropertyExtractor extends ThreadSafeConverter {
private String propertyName;
private Class propertyType;
@SuppressWarnings("unchecked")
public ArrayPropertyExtractor(String propertyName, Class propertyType) {
super(Object[].class, ArrayUtil.arrayType(propertyType));
this.propertyName = propertyName;
this.propertyType = propertyType;
}
@Override
public E[] convert(Object[] sourceValue) throws ConversionException {
return convert(sourceValue, propertyName, propertyType);
}
@SuppressWarnings("unchecked")
public static T[] convert(Object[] sourceValue, String propertyName, Class propertyType)
throws ConversionException {
T[] array = ArrayUtil.newInstance(propertyType, sourceValue.length);
PropertyAccessor propertyAccessor = PropertyAccessorFactory.getAccessor(propertyName);
for (int i = 0; i < sourceValue.length; i++) {
Object value = propertyAccessor.getValue(sourceValue[i]);
array[i] = AnyConverter.convert(value, propertyType);
}
return array;
}
}