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extensions/net.sf.basedb.meludi/trunk/src/net/sf/basedb/meludi/converter/LookupConverter.java

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Rev	Date	Author	Line
2933	14 Nov 14	olle	1	package net.sf.basedb.meludi.converter;
2933	14 Nov 14	olle	2
2933	14 Nov 14	olle	3	import java.util.Map;
2933	14 Nov 14	olle	4
2933	14 Nov 14	olle	5	import net.sf.basedb.core.InvalidDataException;
2933	14 Nov 14	olle	6
2933	14 Nov 14	olle	7
2933	14 Nov 14	olle	8	/**
2933	14 Nov 14	olle	9	Value converter implementation for looking up values in
2933	14 Nov 14	olle	10	a map if given a key. If an error message template is
2933	14 Nov 14	olle	11	given, the converter will throw an {@link InvalidDataException}
2933	14 Nov 14	olle	12	when no value exists for a key. The template may contain the
2933	14 Nov 14	olle	13	marker '{KEY}' which is replaced with the string representation of
2933	14 Nov 14	olle	14	the current key value.
2933	14 Nov 14	olle	15
2933	14 Nov 14	olle	16	@author Nicklas
2933	14 Nov 14	olle	17	@since 2.12
2933	14 Nov 14	olle	18	*/
2933	14 Nov 14	olle	19	public class LookupConverter<F, T>
2933	14 Nov 14	olle	20	implements ValueConverter<F, T>
2933	14 Nov 14	olle	21	{
2933	14 Nov 14	olle	22
2933	14 Nov 14	olle	23	private final Map<F, T> map;
2933	14 Nov 14	olle	24	private final Map<F, String> errors;
2933	14 Nov 14	olle	25
2933	14 Nov 14	olle	26	public LookupConverter(Map<F, T> map, Map<F, String> errors)
2933	14 Nov 14	olle	27	{
2933	14 Nov 14	olle	28	this.map = map;
2933	14 Nov 14	olle	29	this.errors = errors;
2933	14 Nov 14	olle	30	}
2933	14 Nov 14	olle	31
2933	14 Nov 14	olle	32	@Override
2933	14 Nov 14	olle	33	public T convert(F key)
2933	14 Nov 14	olle	34	{
2933	14 Nov 14	olle	35	T value = map.get(key);
2933	14 Nov 14	olle	36	if (value == null && errors != null && errors.containsKey(key))
2933	14 Nov 14	olle	37	{
2933	14 Nov 14	olle	38	throw new InvalidDataException(errors.get(key));
2933	14 Nov 14	olle	39	}
2933	14 Nov 14	olle	40	return value;
2933	14 Nov 14	olle	41	}
2933	14 Nov 14	olle	42
2933	14 Nov 14	olle	43	}