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Julien Ruaux
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subprojects/trino-redisearch/src/main/java/com/redis/trino/JsonTypeUtil.java
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|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.redis.trino; | ||
|
|
||
| import com.fasterxml.jackson.core.JsonFactory; | ||
| import com.fasterxml.jackson.core.JsonFactoryBuilder; | ||
| import com.fasterxml.jackson.core.JsonParser; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import io.airlift.json.ObjectMapperProvider; | ||
| import io.airlift.slice.DynamicSliceOutput; | ||
| import io.airlift.slice.Slice; | ||
| import io.airlift.slice.SliceOutput; | ||
| import io.airlift.slice.Slices; | ||
| import io.trino.spi.TrinoException; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.io.OutputStream; | ||
|
|
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| import static com.fasterxml.jackson.core.JsonFactory.Feature.CANONICALIZE_FIELD_NAMES; | ||
| import static com.fasterxml.jackson.databind.SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS; | ||
| import static com.google.common.base.Preconditions.checkState; | ||
| import static io.trino.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT; | ||
| import static java.lang.String.format; | ||
| import static java.nio.charset.StandardCharsets.UTF_8; | ||
|
|
||
| public final class JsonTypeUtil | ||
| { | ||
| private static final JsonFactory JSON_FACTORY = new JsonFactoryBuilder().disable(CANONICALIZE_FIELD_NAMES).build(); | ||
| private static final ObjectMapper SORTED_MAPPER = new ObjectMapperProvider().get().configure(ORDER_MAP_ENTRIES_BY_KEYS, true); | ||
|
|
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| private JsonTypeUtil() {} | ||
|
|
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| // TODO: this should be available from the engine | ||
| public static Slice jsonParse(Slice slice) | ||
| { | ||
| // cast(json_parse(x) AS t)` will be optimized into `$internal$json_string_to_array/map/row_cast` in ExpressionOptimizer | ||
| // If you make changes to this function (e.g. use parse JSON string into some internal representation), | ||
| // make sure `$internal$json_string_to_array/map/row_cast` is changed accordingly. | ||
| try (JsonParser parser = createJsonParser(JSON_FACTORY, slice)) { | ||
| SliceOutput output = new DynamicSliceOutput(slice.length()); | ||
| SORTED_MAPPER.writeValue((OutputStream) output, SORTED_MAPPER.readValue(parser, Object.class)); | ||
| // At this point, the end of input should be reached. nextToken() has three possible results: | ||
| // - null, if the end of the input was reached | ||
| // - token, if a correct JSON token is found (e.g. '{', 'null', '1') | ||
| // - exception, if there are characters which do not form a valid JSON token (e.g. 'abc') | ||
| checkState(parser.nextToken() == null, "Found characters after the expected end of input"); | ||
| return output.slice(); | ||
| } | ||
| catch (IOException | RuntimeException e) { | ||
| throw new TrinoException(INVALID_FUNCTION_ARGUMENT, format("Cannot convert value to JSON: '%s'", slice.toStringUtf8()), e); | ||
| } | ||
| } | ||
|
|
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| public static Slice toJsonValue(Object value) | ||
| throws IOException | ||
| { | ||
| return Slices.wrappedBuffer(SORTED_MAPPER.writeValueAsBytes(value)); | ||
| } | ||
|
|
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| private static JsonParser createJsonParser(JsonFactory factory, Slice json) | ||
| throws IOException | ||
| { | ||
| // Jackson tries to detect the character encoding automatically when | ||
| // using InputStream, so we pass an InputStreamReader instead. | ||
| return factory.createParser(new InputStreamReader(json.getInput(), UTF_8)); | ||
| } | ||
| } |
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