Package de.xima.fc.converter.json

Class MultiValuedToFlatMapConverter

java.lang.Object

de.xima.fc.converter.json.MultiValuedToFlatMapConverter

public class MultiValuedToFlatMapConverter
extends Object

Converts between a flat map Map<String, V> with compound keys and a multivalued map Map<String, List<V>>.

The flat map uses keys in the format "key.index" to represent lists, where "key" is the base key and "index" is the zero-based index of the value in the list.

For example, the multivalued map:

     Map.of("key", List.of("value1", "value2", "value3"));
 

corresponds to the flat map:

     Map.of("key.0", "value1", "key.1", "value2", "key.2", "value3");
 

Since:

8.5.0

Method Summary

Modifier and Type	Method	Description
static <V> Map<String,List<V>>	fromFlatMap(Map<String,V> flatMap)	Converts a flat map with compound keys into a multivalued map.
static <V> Map<String,V>	toFlatMap(Map<String,List<V>> multiValuedMap)	Converts a multivalued map into a flat map with compound keys.
static <V> void	toFlatMap(Map<String,List<V>> multiValuedMap, Map<String,V> target)	Converts a multivalued map into a flat map with compound keys, writing the result into the provided target map.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

fromFlatMap

public static <V> Map<String,List<V>> fromFlatMap(Map<String,V> flatMap)

Converts a flat map with compound keys into a multivalued map.

Type Parameters:

V - the type of values in the map.

Parameters:

flatMap - The flat map to convert, where keys are in the format "key.index".

Returns:

A multivalued map where each key maps to a list of values.

toFlatMap

public static <V> Map<String,V> toFlatMap(Map<String,List<V>> multiValuedMap)

Converts a multivalued map into a flat map with compound keys.

Type Parameters:

V - the type of values in the map.

Parameters:

multiValuedMap - The multivalued map to convert, where each key maps to a list of values.

Returns:

A flat map where keys are in the format "key.index".

toFlatMap

public static <V> void toFlatMap(Map<String,List<V>> multiValuedMap,
                                 Map<String,V> target)

Converts a multivalued map into a flat map with compound keys, writing the result into the provided target map.

Type Parameters:

V - the type of values in the map.

Parameters:

multiValuedMap - The multivalued map to convert, where each key maps to a list of values.

target - The target flat map where the result will be written.