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ObjectMapper.toJsonNode() Collector Stream Support #4691

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38 changes: 38 additions & 0 deletions src/main/java/tools/jackson/databind/util/JacksonCollectors.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
package tools.jackson.databind.util;

import java.util.stream.Collector;
import tools.jackson.databind.JsonNode;
import tools.jackson.databind.node.ArrayNode;
import tools.jackson.databind.node.JsonNodeCreator;
import tools.jackson.databind.node.JsonNodeFactory;

/**
* Utility class that provides custom {@link Collector} implementations to support Stream operations.
* <p>
* This class is not meant to be instantiated and serves only as a utility class.
* </p>
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*
* @since 2.18
*/
public abstract class JacksonCollectors {
/**
* Creates a {@link Collector} that collects {@link JsonNode} elements into an {@link ArrayNode}.
* <p>
* This method uses a {@link JsonNodeFactory} to create an empty {@link ArrayNode} and then adds each
* {@link JsonNode} to it.
* </p>
*
* @return a {@link Collector} that collects {@link JsonNode} elements into an {@link ArrayNode}
*/
public static Collector<JsonNode, ArrayNode, ArrayNode> toJsonNode() {
return toJsonNode(JsonNodeFactory.instance);
}

public static Collector<JsonNode, ArrayNode, ArrayNode> toJsonNode(JsonNodeCreator nodeCreator) {
return Collector.of(
nodeCreator::arrayNode, // supplier
ArrayNode::add, // accumulator
ArrayNode::addAll // combiner
);
}
}
Original file line number Diff line number Diff line change
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package tools.jackson.databind.util;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;

import java.util.stream.IntStream;
import org.junit.jupiter.api.Test;
import tools.jackson.databind.JsonNode;
import tools.jackson.databind.ObjectMapper;
import tools.jackson.databind.node.ObjectNode;

public class JacksonCollectorsTest {

@Test
public void testToJsonNode()
{
final ObjectMapper objectMapper = new ObjectMapper();

final JsonNode jsonNodeResult = IntStream.range(0, 10)
.mapToObj(i -> {
ObjectNode objectNode = objectMapper.createObjectNode();
objectNode.put("testString", "example");
objectNode.put("testNumber", i);
objectNode.put("testBoolean", true);

return objectNode;
})
.collect(JacksonCollectors.toJsonNode());

assertEquals(10, jsonNodeResult.size());
jsonNodeResult.forEach(jsonNode -> assertFalse(jsonNode.isEmpty()));
}
}