package org.springframework.core.convert.support;
import java.lang.reflect.Array;
import java.util.Collections;
import java.util.Set;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.ConditionalGenericConverter;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
final class StringToArrayConverter implements ConditionalGenericConverter {
private final ConversionService conversionService;
public StringToArrayConverter(ConversionService conversionService) {
this.conversionService = conversionService;
}
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(String.class, Object[].class));
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(),
this.conversionService);
}
@Override
@Nullable
public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (source == null) {
return null;
}
String string = (String) source;
String[] fields = StringUtils.commaDelimitedListToStringArray(string);
TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
Assert.state(targetElementType != null, "No target element type");
Object target = Array.newInstance(targetElementType.getType(), fields.length);
for (int i = 0; i < fields.length; i++) {
String sourceElement = fields[i];
Object targetElement = this.conversionService.convert(sourceElement.trim(), sourceType, targetElementType);
Array.set(target, i, targetElement);
}
return target;
}
}