content: /*
   * Copyright 2012-2019 the original author or authors.
   *
   * 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
   *
   *      https://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.springframework.boot.convert;
  
  import java.util.Collections;
  import java.util.Set;
  
  import org.springframework.core.convert.TypeDescriptor;
  import org.springframework.core.convert.converter.Converter;
  import org.springframework.core.convert.converter.GenericConverter;
  import org.springframework.util.ObjectUtils;
  import org.springframework.util.unit.DataSize;
  import org.springframework.util.unit.DataUnit;
  
  /**
   * {@link Converter} to convert from a {@link String} to a {@link DataSize}. Supports
   * {@link DataSize#parse(CharSequence)}.
   *
   * @author Stephane Nicoll
   * @see DataSizeUnit
   */
  final class StringToDataSizeConverter implements GenericConverter {
  
  	@Override
  	public Set<ConvertiblePair> getConvertibleTypes() {
  		return Collections.singleton(new ConvertiblePair(String.class, DataSize.class));
  	}
  
  	@Override
  	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
  		if (ObjectUtils.isEmpty(source)) {
  			return null;
  		}
  		return convert(source.toString(), getDataUnit(targetType));
  	}
  
  	private DataUnit getDataUnit(TypeDescriptor targetType) {
  		DataSizeUnit annotation = targetType.getAnnotation(DataSizeUnit.class);
  		return (annotation != null) ? annotation.value() : null;
  	}
  
  	private DataSize convert(String source, DataUnit unit) {
  		return DataSize.parse(source, unit);
  	}
  
  }
  