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/*
* Copyright 2017 Google 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.google.firebase.database.utilities.encoding;
import static com.google.firebase.database.utilities.Utilities.hardAssert;
import com.google.firebase.database.DatabaseException;
import com.google.firebase.database.Exclude;
import com.google.firebase.database.GenericTypeIndicator;
import com.google.firebase.database.IgnoreExtraProperties;
import com.google.firebase.database.PropertyName;
import com.google.firebase.database.ThrowOnExtraProperties;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Helper class to convert to/from custom POJO classes and plain Java types. */
public class CustomClassMapper {
private static final Logger logger = LoggerFactory.getLogger(CustomClassMapper.class);
private static final ConcurrentMap, BeanMapper>> mappers = new ConcurrentHashMap<>();
/**
* Converts a Java representation of JSON data to standard library Java data types: Map, Array,
* String, Double, Integer and Boolean. POJOs are converted to Java Maps.
*
* @param object The representation of the JSON data
* @return JSON representation containing only standard library Java types
*/
public static Object convertToPlainJavaTypes(Object object) {
return serialize(object);
}
@SuppressWarnings("unchecked")
public static Map convertToPlainJavaTypes(Map update) {
Object converted = serialize(update);
hardAssert(converted instanceof Map);
return (Map) converted;
}
/**
* Converts a standard library Java representation of JSON data to an object of the provided
* class.
*
* @param object The representation of the JSON data
* @param clazz The class of the object to convert to
* @return The POJO object.
*/
public static T convertToCustomClass(Object object, Class clazz) {
return deserializeToClass(object, clazz);
}
/**
* Converts a standard library Java representation of JSON data to an object of the class provided
* through the GenericTypeIndicator
*
* @param object The representation of the JSON data
* @param typeIndicator The indicator providing class of the object to convert to
* @return The POJO object.
*/
public static T convertToCustomClass(Object object, GenericTypeIndicator typeIndicator) {
Class> clazz = typeIndicator.getClass();
Type genericTypeIndicatorType = clazz.getGenericSuperclass();
if (genericTypeIndicatorType instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) genericTypeIndicatorType;
if (!parameterizedType.getRawType().equals(GenericTypeIndicator.class)) {
throw new DatabaseException(
"Not a direct subclass of GenericTypeIndicator: " + genericTypeIndicatorType);
}
// We are guaranteed to have exactly one type parameter
Type type = parameterizedType.getActualTypeArguments()[0];
return deserializeToType(object, type);
} else {
throw new DatabaseException(
"Not a direct subclass of GenericTypeIndicator: " + genericTypeIndicatorType);
}
}
@SuppressWarnings("unchecked")
private static Object serialize(T obj) {
if (obj == null) {
return null;
} else if (obj instanceof Number) {
if (obj instanceof Float || obj instanceof Double) {
double doubleValue = ((Number) obj).doubleValue();
if (doubleValue <= Long.MAX_VALUE
&& doubleValue >= Long.MIN_VALUE
&& Math.floor(doubleValue) == doubleValue) {
return ((Number) obj).longValue();
}
return doubleValue;
} else if (obj instanceof Long || obj instanceof Integer) {
return obj;
} else {
throw new DatabaseException(
String.format(
"Numbers of type %s are not supported, please use an int, long, float or double",
obj.getClass().getSimpleName()));
}
} else if (obj instanceof String) {
return obj;
} else if (obj instanceof Boolean) {
return obj;
} else if (obj instanceof Character) {
throw new DatabaseException("Characters are not supported, please use Strings");
} else if (obj instanceof Map) {
Map result = new HashMap<>();
for (Map.Entry entry : ((Map) obj).entrySet()) {
Object key = entry.getKey();
if (key instanceof String) {
String keyString = (String) key;
result.put(keyString, serialize(entry.getValue()));
} else {
throw new DatabaseException("Maps with non-string keys are not supported");
}
}
return result;
} else if (obj instanceof Collection) {
if (obj instanceof List) {
List list = (List) obj;
List result = new ArrayList<>(list.size());
for (Object object : list) {
result.add(serialize(object));
}
return result;
} else {
throw new DatabaseException(
"Serializing Collections is not supported, please use Lists instead");
}
} else if (obj.getClass().isArray()) {
throw new DatabaseException(
"Serializing Arrays is not supported, please use Lists instead");
} else if (obj instanceof Enum) {
return ((Enum>) obj).name();
} else {
Class clazz = (Class) obj.getClass();
BeanMapper mapper = loadOrCreateBeanMapperForClass(clazz);
return mapper.serialize(obj);
}
}
@SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
private static T deserializeToType(Object obj, Type type) {
if (obj == null) {
return null;
} else if (type instanceof ParameterizedType) {
return deserializeToParameterizedType(obj, (ParameterizedType) type);
} else if (type instanceof Class) {
return deserializeToClass(obj, (Class) type);
} else if (type instanceof WildcardType) {
throw new DatabaseException("Generic wildcard types are not supported");
} else if (type instanceof GenericArrayType) {
throw new DatabaseException(
"Generic Arrays are not supported, please use Lists instead");
} else {
throw new IllegalStateException("Unknown type encountered: " + type);
}
}
@SuppressWarnings("unchecked")
private static T deserializeToClass(Object obj, Class clazz) {
if (obj == null) {
return null;
} else if (clazz.isPrimitive()
|| Number.class.isAssignableFrom(clazz)
|| Boolean.class.isAssignableFrom(clazz)
|| Character.class.isAssignableFrom(clazz)) {
return deserializeToPrimitive(obj, clazz);
} else if (String.class.isAssignableFrom(clazz)) {
return (T) convertString(obj);
} else if (clazz.isArray()) {
throw new DatabaseException(
"Converting to Arrays is not supported, please use Lists instead");
} else if (clazz.getTypeParameters().length > 0) {
throw new DatabaseException(
"Class "
+ clazz.getName()
+ " has generic type "
+ "parameters, please use GenericTypeIndicator instead");
} else if (clazz.equals(Object.class)) {
return (T) obj;
} else if (clazz.isEnum()) {
return deserializeToEnum(obj, clazz);
} else {
return convertBean(obj, clazz);
}
}
@SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
private static T deserializeToParameterizedType(Object obj, ParameterizedType type) {
// getRawType should always return a Class>
Class> rawType = (Class>) type.getRawType();
if (List.class.isAssignableFrom(rawType)) {
Type genericType = type.getActualTypeArguments()[0];
if (obj instanceof List) {
List list = (List) obj;
List result = new ArrayList<>(list.size());
for (Object object : list) {
result.add(deserializeToType(object, genericType));
}
return (T) result;
} else {
throw new DatabaseException(
"Expected a List while deserializing, but got a " + obj.getClass());
}
} else if (Map.class.isAssignableFrom(rawType)) {
Type keyType = type.getActualTypeArguments()[0];
Type valueType = type.getActualTypeArguments()[1];
if (!keyType.equals(String.class)) {
throw new DatabaseException(
"Only Maps with string keys are supported, "
+ "but found Map with key type "
+ keyType);
}
Map map = expectMap(obj);
HashMap result = new HashMap<>();
for (Map.Entry entry : map.entrySet()) {
result.put(entry.getKey(), deserializeToType(entry.getValue(), valueType));
}
return (T) result;
} else if (Collection.class.isAssignableFrom(rawType)) {
throw new DatabaseException("Collections are not supported, please use Lists instead");
} else {
Map map = expectMap(obj);
BeanMapper mapper = (BeanMapper) loadOrCreateBeanMapperForClass(rawType);
HashMap>, Type> typeMapping = new HashMap<>();
TypeVariable>[] typeVariables = mapper.clazz.getTypeParameters();
Type[] types = type.getActualTypeArguments();
if (types.length != typeVariables.length) {
throw new IllegalStateException("Mismatched lengths for type variables and actual types");
}
for (int i = 0; i < typeVariables.length; i++) {
typeMapping.put(typeVariables[i], types[i]);
}
return mapper.deserialize(map, typeMapping);
}
}
@SuppressWarnings("unchecked")
private static T deserializeToPrimitive(Object obj, Class clazz) {
if (Integer.class.isAssignableFrom(clazz) || int.class.isAssignableFrom(clazz)) {
return (T) convertInteger(obj);
} else if (Boolean.class.isAssignableFrom(clazz) || boolean.class.isAssignableFrom(clazz)) {
return (T) convertBoolean(obj);
} else if (Double.class.isAssignableFrom(clazz) || double.class.isAssignableFrom(clazz)) {
return (T) convertDouble(obj);
} else if (Long.class.isAssignableFrom(clazz) || long.class.isAssignableFrom(clazz)) {
return (T) convertLong(obj);
} else if (Float.class.isAssignableFrom(clazz) || float.class.isAssignableFrom(clazz)) {
return (T) (Float) convertDouble(obj).floatValue();
} else {
throw new DatabaseException(
String.format("Deserializing values to %s is not supported", clazz.getSimpleName()));
}
}
@SuppressWarnings("unchecked")
private static T deserializeToEnum(Object object, Class clazz) {
if (object instanceof String) {
String value = (String) object;
// We cast to Class without generics here since we can't prove the bound
// T extends Enum statically
try {
return (T) Enum.valueOf((Class) clazz, value);
} catch (IllegalArgumentException e) {
throw new DatabaseException(
"Could not find enum value of " + clazz.getName() + " for value \"" + value + "\"");
}
} else {
throw new DatabaseException(
"Expected a String while deserializing to enum "
+ clazz
+ " but got a "
+ object.getClass());
}
}
@SuppressWarnings("unchecked")
private static BeanMapper loadOrCreateBeanMapperForClass(Class clazz) {
BeanMapper mapper = (BeanMapper) mappers.get(clazz);
if (mapper == null) {
mapper = new BeanMapper<>(clazz);
// Inserting without checking is fine because mappers are "pure" and it's okay
// if we create and use multiple by different threads temporarily
mappers.put(clazz, mapper);
}
return mapper;
}
@SuppressWarnings("unchecked")
private static Map expectMap(Object object) {
if (object instanceof Map) {
// TODO: runtime validation of keys?
return (Map) object;
} else {
throw new DatabaseException(
"Expected a Map while deserializing, but got a " + object.getClass());
}
}
private static Integer convertInteger(Object obj) {
if (obj instanceof Integer) {
return (Integer) obj;
} else if (obj instanceof Long || obj instanceof Double) {
double value = ((Number) obj).doubleValue();
if (value >= Integer.MIN_VALUE && value <= Integer.MAX_VALUE) {
return ((Number) obj).intValue();
} else {
throw new DatabaseException(
"Numeric value out of 32-bit integer range: "
+ value
+ ". Did you mean to use a long or double instead of an int?");
}
} else {
throw new DatabaseException(
"Failed to convert a value of type " + obj.getClass().getName() + " to int");
}
}
private static Long convertLong(Object obj) {
if (obj instanceof Integer) {
return ((Integer) obj).longValue();
} else if (obj instanceof Long) {
return (Long) obj;
} else if (obj instanceof Double) {
Double value = (Double) obj;
if (value >= Long.MIN_VALUE && value <= Long.MAX_VALUE) {
return value.longValue();
} else {
throw new DatabaseException(
"Numeric value out of 64-bit long range: "
+ value
+ ". Did you mean to use a double instead of a long?");
}
} else {
throw new DatabaseException(
"Failed to convert a value of type " + obj.getClass().getName() + " to long");
}
}
private static Double convertDouble(Object obj) {
if (obj instanceof Integer) {
return ((Integer) obj).doubleValue();
} else if (obj instanceof Long) {
Long value = (Long) obj;
Double doubleValue = ((Long) obj).doubleValue();
if (doubleValue.longValue() == value) {
return doubleValue;
} else {
throw new DatabaseException(
"Loss of precision while converting number to "
+ "double: "
+ obj
+ ". Did you mean to use a 64-bit long instead?");
}
} else if (obj instanceof Double) {
return (Double) obj;
} else {
throw new DatabaseException(
"Failed to convert a value of type " + obj.getClass().getName() + " to double");
}
}
private static Boolean convertBoolean(Object obj) {
if (obj instanceof Boolean) {
return (Boolean) obj;
} else {
throw new DatabaseException(
"Failed to convert value of type " + obj.getClass().getName() + " to boolean");
}
}
private static String convertString(Object obj) {
if (obj instanceof String) {
return (String) obj;
} else {
throw new DatabaseException(
"Failed to convert value of type " + obj.getClass().getName() + " to String");
}
}
private static T convertBean(Object obj, Class clazz) {
BeanMapper mapper = loadOrCreateBeanMapperForClass(clazz);
if (obj instanceof Map) {
return mapper.deserialize(expectMap(obj));
} else {
throw new DatabaseException(
"Can't convert object of type "
+ obj.getClass().getName()
+ " to type "
+ clazz.getName());
}
}
private static class BeanMapper {
private final Class clazz;
private final Constructor constructor;
private final boolean throwOnUnknownProperties;
private final boolean warnOnUnknownProperties;
// Case insensitive mapping of properties to their case sensitive versions
private final Map properties;
private final Map getters;
private final Map setters;
private final Map fields;
public BeanMapper(Class clazz) {
this.clazz = clazz;
this.throwOnUnknownProperties = clazz.isAnnotationPresent(ThrowOnExtraProperties.class);
this.warnOnUnknownProperties = !clazz.isAnnotationPresent(IgnoreExtraProperties.class);
this.properties = new HashMap<>();
this.setters = new HashMap<>();
this.getters = new HashMap<>();
this.fields = new HashMap<>();
Constructor constructor = null;
try {
constructor = clazz.getDeclaredConstructor();
constructor.setAccessible(true);
} catch (NoSuchMethodException e) {
// We will only fail at deserialization time if no constructor is present
constructor = null;
}
this.constructor = constructor;
// Add any public getters to properties (including isXyz())
for (Method method : clazz.getMethods()) {
if (shouldIncludeGetter(method)) {
String propertyName = propertyName(method);
addProperty(propertyName);
method.setAccessible(true);
if (getters.containsKey(propertyName)) {
throw new DatabaseException("Found conflicting getters for name: " + method.getName());
}
getters.put(propertyName, method);
}
}
// Add any public fields to properties
for (Field field : clazz.getFields()) {
if (shouldIncludeField(field)) {
String propertyName = propertyName(field);
addProperty(propertyName);
}
}
// We can use private setters and fields for known (public) properties/getters. Since
// getMethods/getFields only returns public methods/fields we need to traverse the
// class hierarchy to find the appropriate setter or field.
Class super T> currentClass = clazz;
do {
// Add any setters
for (Method method : currentClass.getDeclaredMethods()) {
if (shouldIncludeSetter(method)) {
String propertyName = propertyName(method);
String existingPropertyName = properties.get(propertyName.toLowerCase());
if (existingPropertyName != null) {
if (!existingPropertyName.equals(propertyName)) {
throw new DatabaseException(
"Found setter with invalid case-sensitive name: " + method.getName());
} else {
Method existingSetter = setters.get(propertyName);
if (existingSetter == null) {
method.setAccessible(true);
setters.put(propertyName, method);
} else if (!isSetterOverride(method, existingSetter)) {
// We require that setters with conflicting property names are
// overrides from a base class
throw new DatabaseException(
"Found a conflicting setters "
+ "with name: "
+ method.getName()
+ " (conflicts with "
+ existingSetter.getName()
+ " defined on "
+ existingSetter.getDeclaringClass().getName()
+ ")");
}
}
}
}
}
for (Field field : currentClass.getDeclaredFields()) {
String propertyName = propertyName(field);
// Case sensitivity is checked at deserialization time
// Fields are only added if they don't exist on a subclass
if (properties.containsKey(propertyName.toLowerCase())
&& !fields.containsKey(propertyName)) {
field.setAccessible(true);
fields.put(propertyName, field);
}
}
// Traverse class hierarchy until we reach java.lang.Object which contains a bunch
// of fields/getters we don't want to serialize
currentClass = currentClass.getSuperclass();
} while (currentClass != null && !currentClass.equals(Object.class));
if (properties.isEmpty()) {
throw new DatabaseException("No properties to serialize found on class " + clazz.getName());
}
}
private static boolean shouldIncludeGetter(Method method) {
if (!method.getName().startsWith("get") && !method.getName().startsWith("is")) {
return false;
}
// Exclude methods from Object.class
if (method.getDeclaringClass().equals(Object.class)) {
return false;
}
// Non-public methods
if (!Modifier.isPublic(method.getModifiers())) {
return false;
}
// Static methods
if (Modifier.isStatic(method.getModifiers())) {
return false;
}
// No return type
if (method.getReturnType().equals(Void.TYPE)) {
return false;
}
// Non-zero parameters
if (method.getParameterTypes().length != 0) {
return false;
}
// Excluded methods
if (method.isAnnotationPresent(Exclude.class)) {
return false;
}
return true;
}
private static boolean shouldIncludeSetter(Method method) {
if (!method.getName().startsWith("set")) {
return false;
}
// Exclude methods from Object.class
if (method.getDeclaringClass().equals(Object.class)) {
return false;
}
// Static methods
if (Modifier.isStatic(method.getModifiers())) {
return false;
}
// Has a return type
if (!method.getReturnType().equals(Void.TYPE)) {
return false;
}
// Methods without exactly one parameters
if (method.getParameterTypes().length != 1) {
return false;
}
// Excluded methods
if (method.isAnnotationPresent(Exclude.class)) {
return false;
}
return true;
}
private static boolean shouldIncludeField(Field field) {
// Exclude methods from Object.class
if (field.getDeclaringClass().equals(Object.class)) {
return false;
}
// Non-public fields
if (!Modifier.isPublic(field.getModifiers())) {
return false;
}
// Static fields
if (Modifier.isStatic(field.getModifiers())) {
return false;
}
// Transient fields
if (Modifier.isTransient(field.getModifiers())) {
return false;
}
// Excluded fields
if (field.isAnnotationPresent(Exclude.class)) {
return false;
}
return true;
}
private static boolean isSetterOverride(Method base, Method override) {
// We expect an overridden setter here
hardAssert(
base.getDeclaringClass().isAssignableFrom(override.getDeclaringClass()),
"Expected override from a base class");
hardAssert(base.getReturnType().equals(Void.TYPE), "Expected void return type");
hardAssert(override.getReturnType().equals(Void.TYPE), "Expected void return type");
Type[] baseParameterTypes = base.getParameterTypes();
Type[] overrideParameterTypes = override.getParameterTypes();
hardAssert(baseParameterTypes.length == 1, "Expected exactly one parameter");
hardAssert(overrideParameterTypes.length == 1, "Expected exactly one parameter");
return base.getName().equals(override.getName())
&& baseParameterTypes[0].equals(overrideParameterTypes[0]);
}
private static String propertyName(Field field) {
String annotatedName = annotatedName(field);
return annotatedName != null ? annotatedName : field.getName();
}
private static String propertyName(Method method) {
String annotatedName = annotatedName(method);
return annotatedName != null ? annotatedName : serializedName(method.getName());
}
private static String annotatedName(AccessibleObject obj) {
if (obj.isAnnotationPresent(PropertyName.class)) {
PropertyName annotation = obj.getAnnotation(PropertyName.class);
return annotation.value();
}
return null;
}
private static String serializedName(String methodName) {
String[] prefixes = new String[] {"get", "set", "is"};
String methodPrefix = null;
for (String prefix : prefixes) {
if (methodName.startsWith(prefix)) {
methodPrefix = prefix;
}
}
if (methodPrefix == null) {
throw new IllegalArgumentException("Unknown Bean prefix for method: " + methodName);
}
String strippedName = methodName.substring(methodPrefix.length());
// Make sure the first word or upper-case prefix is converted to lower-case
char[] chars = strippedName.toCharArray();
int pos = 0;
while (pos < chars.length && Character.isUpperCase(chars[pos])) {
chars[pos] = Character.toLowerCase(chars[pos]);
pos++;
}
return new String(chars);
}
private void addProperty(String property) {
String oldValue = this.properties.put(property.toLowerCase(), property);
if (oldValue != null && !property.equals(oldValue)) {
throw new DatabaseException(
"Found two getters or fields with conflicting case "
+ "sensitivity for property: "
+ property.toLowerCase());
}
}
public T deserialize(Map values) {
return deserialize(values, Collections.>, Type>emptyMap());
}
public T deserialize(Map values, Map>, Type> types) {
if (this.constructor == null) {
throw new DatabaseException(
"Class " + this.clazz.getName() + " is missing a constructor with no arguments");
}
T instance;
try {
instance = this.constructor.newInstance();
} catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
for (Map.Entry entry : values.entrySet()) {
String propertyName = entry.getKey();
if (this.setters.containsKey(propertyName)) {
Method setter = this.setters.get(propertyName);
Type[] params = setter.getGenericParameterTypes();
if (params.length != 1) {
throw new IllegalStateException("Setter does not have exactly one parameter");
}
Type resolvedType = resolveType(params[0], types);
Object value = CustomClassMapper.deserializeToType(entry.getValue(), resolvedType);
try {
setter.invoke(instance, value);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
} else if (this.fields.containsKey(propertyName)) {
Field field = this.fields.get(propertyName);
Type resolvedType = resolveType(field.getGenericType(), types);
Object value = CustomClassMapper.deserializeToType(entry.getValue(), resolvedType);
try {
field.set(instance, value);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
} else {
String message =
"No setter/field for "
+ propertyName
+ " found "
+ "on class "
+ this.clazz.getName();
if (this.properties.containsKey(propertyName.toLowerCase())) {
message += " (fields/setters are case sensitive!)";
}
if (this.throwOnUnknownProperties) {
throw new DatabaseException(message);
} else if (this.warnOnUnknownProperties) {
logger.warn(message);
}
}
}
return instance;
}
private Type resolveType(Type type, Map>, Type> types) {
if (type instanceof TypeVariable) {
Type resolvedType = types.get(type);
if (resolvedType == null) {
throw new IllegalStateException("Could not resolve type " + type);
} else {
return resolvedType;
}
} else {
return type;
}
}
public Map serialize(T object) {
if (!clazz.isAssignableFrom(object.getClass())) {
throw new IllegalArgumentException(
"Can't serialize object of class "
+ object.getClass()
+ " with BeanMapper for class "
+ clazz);
}
Map result = new HashMap<>();
for (String property : this.properties.values()) {
Object propertyValue;
if (this.getters.containsKey(property)) {
Method getter = this.getters.get(property);
try {
propertyValue = getter.invoke(object);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
} else {
// Must be a field
Field field = this.fields.get(property);
if (field == null) {
throw new IllegalStateException("Bean property without field or getter:" + property);
}
try {
propertyValue = field.get(object);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
Object serializedValue = CustomClassMapper.serialize(propertyValue);
result.put(property, serializedValue);
}
return result;
}
}
}