Serialization.java
/*
* Copyright 2020 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.keycloak.models.map.common;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreType;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
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.SerializationFeature;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.datatype.jdk8.StreamSerializer;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Stream;
/**
*
* @author hmlnarik
*/
public class Serialization {
public static final ObjectMapper MAPPER = new ObjectMapper()
.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
.enable(SerializationFeature.INDENT_OUTPUT)
.setSerializationInclusion(JsonInclude.Include.NON_NULL)
.setVisibility(PropertyAccessor.ALL, Visibility.NONE)
.setVisibility(PropertyAccessor.FIELD, Visibility.ANY)
.activateDefaultTyping(new LaissezFaireSubTypeValidator() /* TODO - see javadoc */, ObjectMapper.DefaultTyping.NON_CONCRETE_AND_ARRAYS, JsonTypeInfo.As.PROPERTY)
.addMixIn(UpdatableEntity.class, IgnoreUpdatedMixIn.class)
.addMixIn(DeepCloner.class, IgnoredTypeMixIn.class)
;
public static final ConcurrentHashMap<Class<?>, ObjectReader> READERS = new ConcurrentHashMap<>();
public static final ConcurrentHashMap<Class<?>, ObjectWriter> WRITERS = new ConcurrentHashMap<>();
@JsonIgnoreType
public class IgnoredTypeMixIn {}
public abstract class IgnoreUpdatedMixIn {
@JsonIgnore public abstract boolean isUpdated();
}
static {
JavaType type = TypeFactory.unknownType();
JavaType streamType = MAPPER.getTypeFactory().constructParametricType(Stream.class, type);
SimpleModule module = new SimpleModule().addSerializer(new StreamSerializer(streamType, type));
MAPPER.registerModule(module);
}
public static <T> T from(T orig) {
if (orig == null) {
return null;
}
@SuppressWarnings("unchecked")
final Class<T> origClass = (Class<T>) orig.getClass();
// Naive solution but will do.
try {
ObjectReader reader = READERS.computeIfAbsent(origClass, MAPPER::readerFor);
ObjectWriter writer = WRITERS.computeIfAbsent(origClass, MAPPER::writerFor);
final T res;
res = reader.readValue(writer.writeValueAsBytes(orig));
return res;
} catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
public static <T> T from(T orig, T target) {
if (orig == null) {
return null;
}
@SuppressWarnings("unchecked")
final Class<T> origClass = (Class<T>) orig.getClass();
// Naive solution but will do.
try {
ObjectReader reader = MAPPER.readerForUpdating(target);
ObjectWriter writer = WRITERS.computeIfAbsent(origClass, MAPPER::writerFor);
final T res;
res = reader.readValue(writer.writeValueAsBytes(orig));
if (res != target) {
throw new IllegalStateException("Should clone into desired target");
}
return res;
} catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
}