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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.flags;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.Collection;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicReference;
import static com.yahoo.yolean.Exceptions.uncheck;
/**
* {@link RawFlag} using Jackson's {@link JsonNode}.
*
* @author hakonhall
*/
public class JsonNodeRawFlag implements RawFlag {
private static final AtomicReference<ObjectMapper> mapper = new AtomicReference<>();
private final JsonNode jsonNode;
private JsonNodeRawFlag(JsonNode jsonNode) {
this.jsonNode = jsonNode;
}
public static JsonNodeRawFlag fromJson(String json) {
return new JsonNodeRawFlag(uncheck(() -> objectMapper().readTree(json)));
}
public static JsonNodeRawFlag fromJsonNode(JsonNode jsonNode) {
return new JsonNodeRawFlag(jsonNode);
}
public static <T> JsonNodeRawFlag fromJacksonClass(T value) {
return new JsonNodeRawFlag(uncheck(() -> objectMapper().valueToTree(value)));
}
public <T> T toJacksonClass(Class<T> jacksonClass) {
return uncheck(() -> objectMapper().treeToValue(jsonNode, jacksonClass));
}
public <T> T toJacksonClass(JavaType jacksonClass) {
return uncheck(() -> objectMapper().readValue(jsonNode.toString(), jacksonClass));
}
@SuppressWarnings("rawtypes")
public static JavaType constructCollectionType(Class<? extends Collection> collectionClass, Class<?> elementClass) {
return objectMapper().getTypeFactory().constructCollectionType(collectionClass, elementClass);
}
@Override
public JsonNode asJsonNode() {
return jsonNode;
}
@Override
public String asJson() {
return jsonNode.toString();
}
@Override
public String toString() {
return "JsonNodeRawFlag{" +
"jsonNode=" + jsonNode +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
JsonNodeRawFlag that = (JsonNodeRawFlag) o;
return jsonNode.equals(that.jsonNode);
}
@Override
public int hashCode() {
return Objects.hash(jsonNode);
}
/** Initialize object mapper lazily */
private static ObjectMapper objectMapper() {
// ObjectMapper is a heavy-weight object so we construct it only when we need it
return mapper.updateAndGet((objectMapper) -> {
if (objectMapper != null) return objectMapper;
return new ObjectMapper();
});
}
}
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