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/*
* Copyright 2010 Proofpoint, 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 io.airlift.json;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Suppliers;
import com.google.common.reflect.TypeParameter;
import com.google.common.reflect.TypeToken;
import io.airlift.json.LengthLimitedWriter.LengthLimitExceededException;
import java.io.IOException;
import java.io.StringWriter;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Supplier;
import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
import static com.google.common.base.Preconditions.checkArgument;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
public class JsonCodec
{
private static final Supplier OBJECT_MAPPER_SUPPLIER = Suppliers.memoize(
() -> new ObjectMapperProvider().get().enable(INDENT_OUTPUT));
public static JsonCodec jsonCodec(Class type)
{
requireNonNull(type, "type is null");
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), type);
}
public static JsonCodec jsonCodec(TypeToken type)
{
requireNonNull(type, "type is null");
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), type.getType());
}
public static JsonCodec> listJsonCodec(Class type)
{
requireNonNull(type, "type is null");
Type listType = new TypeToken>() {}
.where(new TypeParameter() {}, type)
.getType();
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), listType);
}
public static JsonCodec> listJsonCodec(JsonCodec type)
{
requireNonNull(type, "type is null");
Type listType = new TypeToken>() {}
.where(new TypeParameter() {}, type.getTypeToken())
.getType();
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), listType);
}
public static JsonCodec> mapJsonCodec(Class keyType, Class valueType)
{
requireNonNull(keyType, "keyType is null");
requireNonNull(valueType, "valueType is null");
Type mapType = new TypeToken>() {}
.where(new TypeParameter() {}, keyType)
.where(new TypeParameter() {}, valueType)
.getType();
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), mapType);
}
public static JsonCodec> mapJsonCodec(Class keyType, JsonCodec valueType)
{
requireNonNull(keyType, "keyType is null");
requireNonNull(valueType, "valueType is null");
Type mapType = new TypeToken>() {}
.where(new TypeParameter() {}, keyType)
.where(new TypeParameter() {}, valueType.getTypeToken())
.getType();
return new JsonCodec<>(OBJECT_MAPPER_SUPPLIER.get(), mapType);
}
private final ObjectMapper mapper;
private final Type type;
private final JavaType javaType;
JsonCodec(ObjectMapper mapper, Type type)
{
this.mapper = mapper;
this.type = type;
this.javaType = mapper.getTypeFactory().constructType(type);
}
/**
* Gets the type this codec supports.
*/
public Type getType()
{
return type;
}
/**
* Converts the specified json string into an instance of type T.
*
* @param json the json string to parse
* @return parsed response; never null
* @throws IllegalArgumentException if the json string can not be converted to the type T
*/
public T fromJson(String json)
throws IllegalArgumentException
{
try (JsonParser parser = mapper.createParser(json)) {
T value = mapper.readerFor(javaType).readValue(parser);
checkArgument(parser.nextToken() == null, "Found characters after the expected end of input");
return value;
}
catch (IOException e) {
throw new IllegalArgumentException(format("Invalid JSON string for %s", javaType), e);
}
}
/**
* Converts the specified instance to json.
*
* @param instance the instance to convert to json
* @return json string
* @throws IllegalArgumentException if the specified instance can not be converted to json
*/
public String toJson(T instance)
throws IllegalArgumentException
{
try {
return mapper.writerFor(javaType).writeValueAsString(instance);
}
catch (IOException e) {
throw new IllegalArgumentException(format("%s could not be converted to JSON", instance.getClass().getName()), e);
}
}
/**
* Converts the specified instance to optional json string with a length limit. Returns Optional.empty() if length limit is exceeded.
*
* @param instance the instance to convert to json
* @param lengthLimit the maximum length of the serialized string in characters
* @return json string
* @throws IllegalArgumentException if the specified instance can not be converted to json
*/
public Optional toJsonWithLengthLimit(T instance, int lengthLimit)
{
try (StringWriter stringWriter = new StringWriter();
LengthLimitedWriter lengthLimitedWriter = new LengthLimitedWriter(stringWriter, lengthLimit)) {
mapper.writeValue(lengthLimitedWriter, instance);
return Optional.of(stringWriter.getBuffer().toString());
}
catch (LengthLimitExceededException e) {
return Optional.empty();
}
catch (IOException e) {
throw new IllegalArgumentException(format("%s could not be converted to JSON", instance.getClass().getName()), e);
}
}
/**
* Coverts the specified json bytes (UTF-8) into an instance of type T.
*
* @param json the json bytes (UTF-8) to parse
* @return parsed response; never null
* @throws IllegalArgumentException if the json bytes can not be converted to the type T
*/
public T fromJson(byte[] json)
throws IllegalArgumentException
{
try (JsonParser parser = mapper.createParser(json)) {
T value = mapper.readerFor(javaType).readValue(parser);
checkArgument(parser.nextToken() == null, "Found characters after the expected end of input");
return value;
}
catch (IOException e) {
throw new IllegalArgumentException(format("Invalid JSON bytes for %s", javaType), e);
}
}
/**
* Converts the specified instance to json.
*
* @param instance the instance to convert to json
* @return json bytes (UTF-8)
* @throws IllegalArgumentException if the specified instance can not be converted to json
*/
public byte[] toJsonBytes(T instance)
throws IllegalArgumentException
{
try {
return mapper.writerFor(javaType).writeValueAsBytes(instance);
}
catch (IOException e) {
throw new IllegalArgumentException(format("%s could not be converted to JSON", instance.getClass().getName()), e);
}
}
@SuppressWarnings("unchecked")
TypeToken getTypeToken()
{
return (TypeToken) TypeToken.of(type);
}
}
