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'rapiddweller Common' is an open source Java library forked from Databene Commons 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 com.rapiddweller.common.bean;

import com.rapiddweller.common.ArrayUtil;
import com.rapiddweller.common.ConversionException;
import com.rapiddweller.common.converter.AnyConverter;
import com.rapiddweller.common.converter.ThreadSafeConverter;

/**
 * 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 final String propertyName;
  private final Class propertyType;

  /**
   * Instantiates a new Array property extractor.
   *
   * @param propertyName the property name
   * @param propertyType the property type
   */
  @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);
  }

  /**
   * Convert t [ ].
   *
   * @param           the type parameter
   * @param sourceValue  the source value
   * @param propertyName the property name
   * @param propertyType the property type
   * @return the t [ ]
   * @throws ConversionException the conversion exception
   */
  @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;
  }

}