001/* -*- mode: Java; c-basic-offset: 2; indent-tabs-mode: nil; coding: utf-8-unix -*-
002 *
003 * Copyright © 2017 MicroBean.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
014 * implied.  See the License for the specific language governing
015 * permissions and limitations under the License.
016 */
017package org.microbean.configuration.spi.converter;
018
019import java.util.Arrays;
020
021import org.microbean.configuration.spi.Converter;
022
023public final class StringToIntArrayConverter extends Converter<int[]> {
024
025  private static final long serialVersionUID = 1L;
026
027  private static final int[] EMPTY_INT_ARRAY = new int[0];
028
029  private static final StringToIntegerConverter scalarConverter = new StringToIntegerConverter();
030  
031  @Override
032  public final int[] convert(final String value) {
033    int[] returnValue = null;
034    if (value != null) {
035      if (value.isEmpty()) {
036        returnValue = EMPTY_INT_ARRAY;
037      } else {
038        returnValue = Arrays.stream(value.split(","))
039          .map(String::trim)
040          .filter(s -> !s.isEmpty())
041          .mapToInt(scalarConverter::convert)
042          .toArray();
043      }
044    }
045    return returnValue;
046  }
047  
048}