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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/JacksonUtil.java
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|---|---|---|
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 org.apache.hadoop.util; | ||
|
|
||
| import com.fasterxml.jackson.core.JsonFactory; | ||
| import com.fasterxml.jackson.databind.JavaType; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.databind.ObjectReader; | ||
| import com.fasterxml.jackson.databind.ObjectWriter; | ||
| import com.fasterxml.jackson.databind.json.JsonMapper; | ||
|
|
||
| /** | ||
| * Utility for sharing code related to Jackson usage in Hadoop. | ||
| * | ||
| * @since 3.5.0 | ||
| */ | ||
| public class JacksonUtil { | ||
|
|
||
| private static final JsonFactory DEFAULT_JSON_FACTORY = createBasicJsonFactory(); | ||
| private static final ObjectMapper DEFAULT_OBJECT_MAPPER = createBasicObjectMapper(); | ||
|
|
||
| /** | ||
| * Creates a new {@link JsonFactory} instance with basic configuration. | ||
| * | ||
| * @return an {@link JsonFactory} with basic configuration | ||
| */ | ||
| public static JsonFactory createBasicJsonFactory() { | ||
| // do not expose DEFAULT_JSON_FACTORY because we don't want anyone to access it and modify it | ||
| return new JsonFactory(); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new {@link ObjectMapper} instance with basic configuration. | ||
| * | ||
| * @return an {@link ObjectMapper} with basic configuration | ||
| */ | ||
| public static ObjectMapper createBasicObjectMapper() { | ||
| // do not expose DEFAULT_OBJECT_MAPPER because we don't want anyone to access it and modify it | ||
| return JsonMapper.builder(DEFAULT_JSON_FACTORY).build(); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new {@link ObjectMapper} instance based on the configuration | ||
| * in the input {@link JsonFactory}. | ||
| * | ||
| * @param jsonFactory a pre-configured {@link JsonFactory} | ||
| * @return an {@link ObjectMapper} with configuration set by the input {@link JsonFactory}. | ||
| */ | ||
| public static ObjectMapper createObjectMapper(final JsonFactory jsonFactory) { | ||
| return JsonMapper.builder(jsonFactory).build(); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new {@link ObjectReader} for the provided type. | ||
| * | ||
| * @param type a class instance | ||
| * @return an {@link ObjectReader} with basic configuration | ||
| */ | ||
| public static ObjectReader createReaderFor(final Class<?> type) { | ||
| return DEFAULT_OBJECT_MAPPER.readerFor(type); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new {@link ObjectReader} for the provided type. | ||
| * | ||
| * @param type a {@link JavaType} instance | ||
| * @return an {@link ObjectReader} with basic configuration | ||
| */ | ||
| public static ObjectReader createReaderFor(final JavaType type) { | ||
| return DEFAULT_OBJECT_MAPPER.readerFor(type); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new {@link ObjectWriter} with basic configuration. | ||
| * | ||
| * @return an {@link ObjectWriter} with basic configuration | ||
| */ | ||
| public static ObjectWriter createBasicWriter() { | ||
| return DEFAULT_OBJECT_MAPPER.writer(); | ||
| } | ||
| } |
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