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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2018 Couchbase, Inc.
*
* 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.couchbase.client.core.json;
import com.couchbase.client.core.annotation.Stability;
import com.couchbase.client.core.deps.com.fasterxml.jackson.core.StreamReadConstraints;
import com.couchbase.client.core.deps.com.fasterxml.jackson.core.type.TypeReference;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.JsonNode;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.ObjectMapper;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.ObjectReader;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.ObjectWriter;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.node.ArrayNode;
import com.couchbase.client.core.deps.com.fasterxml.jackson.databind.node.ObjectNode;
import static com.couchbase.client.core.logging.RedactableArgument.redactUser;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Provides utilities for encoding and decoding JSON data.
*
* @since 2.0.0
*/
@Stability.Internal
public class Mapper {
private Mapper() {
throw new AssertionError("not instantiable");
}
// ObjectMapper is mutable. To prevent it from being accidentally (or maliciously) reconfigured,
// don't expose the ObjectMapper outside this class.
private static final ObjectMapper mapper = newObjectMapper();
public static ObjectMapper newObjectMapper() {
ObjectMapper mapper = new ObjectMapper();
mapper.getFactory().setStreamReadConstraints(
StreamReadConstraints.defaults().rebuild()
.maxStringLength(20 * 1024 * 1024) // increase from 5 MB to 20 MiB
.build()
);
return mapper;
}
// Instead, expose immutable reader and writer for advanced use cases.
private static final ObjectReader reader = mapper.reader();
private static final ObjectWriter writer = mapper.writer();
/**
* Encodes the given input into a byte array, formatted non-pretty.
*
* @param input the java object as input
* @return the json encoded byte array.
*/
public static byte[] encodeAsBytes(final Object input) {
try {
return mapper.writeValueAsBytes(input);
} catch (Exception ex) {
throw new MapperException("Could not encode into JSON: " + redactUser(input), ex);
}
}
/**
* Encodes the given input into a byte array, formatted pretty.
*
* @param input the java object as input
* @return the json encoded byte array.
*/
public static byte[] encodeAsBytesPretty(final Object input) {
try {
return mapper.writerWithDefaultPrettyPrinter().writeValueAsBytes(input);
} catch (Exception ex) {
throw new MapperException("Could not encode into JSON: " + redactUser(input), ex);
}
}
/**
* Encodes the given input into a String, formatted non-pretty.
*
* @param input the java object as input
* @return the json encoded String.
*/
public static String encodeAsString(final Object input) {
try {
return mapper.writeValueAsString(input);
} catch (Exception ex) {
throw new MapperException("Could not encode into JSON: " + redactUser(input), ex);
}
}
/**
* Encodes the given input into a String, formatted pretty.
*
* @param input the java object as input
* @return the json encoded String.
*/
public static String encodeAsStringPretty(final Object input) {
try {
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(input);
} catch (Exception ex) {
throw new MapperException("Could not encode into JSON: " + redactUser(input), ex);
}
}
/**
* Decodes a byte array into the given class.
*
* @param input the input byte array.
* @param clazz the clazz which should be decoded into.
* @param generic type used for inference.
* @return the created instance.
*/
public static T decodeInto(byte[] input, Class clazz) {
try {
return mapper.readValue(input, clazz);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(new String(input, UTF_8)), ex);
}
}
/**
* Decodes a String into the given class.
*
* @param input the input byte array.
* @param clazz the clazz which should be decoded into.
* @param generic type used for inference.
* @return the created instance.
*/
public static T decodeInto(String input, Class clazz) {
try {
return mapper.readValue(input, clazz);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(input), ex);
}
}
/**
* Decodes a byte array into the given type.
*
* @param input the input byte array.
* @param type the type which should be decoded into.
* @param generic type used for inference.
* @return the created instance.
*/
public static T decodeInto(byte[] input, TypeReference type) {
try {
return mapper.readValue(input, type);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(new String(input, UTF_8)), ex);
}
}
/**
* Decodes a String into the given type.
*
* @param input the input byte array.
* @param type the type which should be decoded into.
* @param generic type used for inference.
* @return the created instance.
*/
public static T decodeInto(String input, TypeReference type) {
try {
return mapper.readValue(input, type);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(input), ex);
}
}
/**
* Decodes a byte array into a tree of JSON nodes.
*
* @param input the input byte array.
* @return the created node.
*/
public static JsonNode decodeIntoTree(byte[] input) {
try {
return mapper.readTree(input);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(new String(input, UTF_8)), ex);
}
}
/**
* Decodes a string into a tree of JSON nodes.
*
* @param input the input byte array.
* @return the created node.
*/
public static JsonNode decodeIntoTree(String input) {
try {
return mapper.readTree(input);
} catch (Exception ex) {
throw new MapperException("Could not decode from JSON: " + redactUser(input), ex);
}
}
/**
* Converts an object to the requested type using
* {@link ObjectMapper#convertValue(Object, Class)}.
*/
public static T convertValue(Object fromValue, Class toValueType) {
return mapper.convertValue(fromValue, toValueType);
}
/**
* Converts an object to the requested type using
* {@link ObjectMapper#convertValue(Object, TypeReference)}.
*/
public static T convertValue(Object fromValue, TypeReference toValueTypeRef) {
return mapper.convertValue(fromValue, toValueTypeRef);
}
/**
* Returns an ObjectReader for advanced use cases.
*/
public static ObjectReader reader() {
return reader;
}
/**
* Returns an ObjectWriter for advanced use cases.
*/
public static ObjectWriter writer() {
return writer;
}
/**
* Returns a new empty ObjectNode.
*/
public static ObjectNode createObjectNode() {
return mapper.createObjectNode();
}
/**
* Returns a new empty ArrayNode.
*/
public static ArrayNode createArrayNode() {
return mapper.createArrayNode();
}
}