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apoc.map.unflatten function, fixes #69 #72

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Merged
merged 1 commit into from
May 1, 2020
Merged

apoc.map.unflatten function, fixes #69 #72

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30 changes: 30 additions & 0 deletions src/main/java/apoc/map/Maps.java
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Original file line number Diff line number Diff line change
Expand Up @@ -295,6 +295,36 @@ private void flattenMapRecursively(Map<String, Object> flattenedMap, Map<String,
}
}

@UserFunction
@Description("apoc.map.unflatten(map) yield map - unflattens dot notated nested items in map")
public Map<String,Object> unflatten( @Name( "flatMap" ) Map<String,Object> flatMap ) {
Map<String,Object> unflattenedMap = new HashMap<>();

for ( Map.Entry<String, Object> entry : flatMap.entrySet() ) {
String[] keys = entry.getKey().split( "\\." );

Map<String, Object> current = unflattenedMap;

for ( int i = 0; i < keys.length - 1; ++i ) {
String key = keys[i];

Object temp = current.get( key );
if ( temp == null ) {
Map<String, Object> next = new HashMap<>();
current.put( key, next );
current = next;
continue;
}

current = (Map<String, Object>) temp;
}

current.put( keys[keys.length - 1], entry.getValue() );
}

return unflattenedMap;
}

@UserFunction
@Description("apoc.map.sortedProperties(map, ignoreCase:true) - returns a list of key/value list pairs, with pairs sorted by keys alphabetically, with optional case sensitivity")
public List<List<Object>> sortedProperties(@Name("map") Map<String, Object> map, @Name(value="ignoreCase", defaultValue = "true") boolean ignoreCase) {
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16 changes: 16 additions & 0 deletions src/test/java/apoc/map/MapsTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import org.neo4j.graphdb.Node;
import org.neo4j.test.rule.DbmsRule;
import org.neo4j.test.rule.ImpermanentDbmsRule;
import org.neo4j.graphdb.QueryExecutionException;

import java.util.List;
import java.util.Map;
Expand Down Expand Up @@ -317,6 +318,21 @@ public void testFlattenWithDelimiter() {
});
}

@SuppressWarnings("unchecked")
public void testUnflatten() {
Map<String, Object> flatMap = map( "string", "value", "int", 10, "nested.anotherkey", "anotherValue", "nested.nested.somekey", "someValue", "nested.nested.somenumeric", 123 );
TestUtil.testCall( db, "RETURN apoc.map.unflatten($map) AS value", map( "map", flatMap ), (r) -> {
Map<String, Object> resultMap = (Map<String, Object>)r.get( "value" );
assertEquals( map( "string", "value", "int", 10, "nested", map( "anotherkey", "anotherValue", "nested", map( "somekey", "someValue", "somenumeric", 123 ) ) ), resultMap );
} );
}

@Test (expected = QueryExecutionException.class)
public void testUnflattenConflictingKeys() {
Map<String, Object> flatMap = map( "key", "value", "key.nested", "anotherValue" );
TestUtil.testCall( db, "RETURN apoc.map.unflatten($map) AS value", map( "map", flatMap ), (r) -> {} );
}

@Test
public void testSortedProperties() {
TestUtil.testCall(db, "WITH {b:8, d:3, a:2, E: 12, C:9} as map RETURN apoc.map.sortedProperties(map, false) AS sortedProperties", (r) -> {
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