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/*
* Copyright 2001-present Stephen Colebourne
*
* 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.joda.beans.ser.bin;
import static java.util.Collections.reverseOrder;
import static java.util.Comparator.comparingInt;
import static java.util.stream.Collectors.toList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.StreamSupport;
import org.joda.beans.Bean;
import org.joda.beans.ImmutableBean;
import org.joda.beans.MetaBean;
import org.joda.beans.MetaProperty;
import org.joda.beans.ser.JodaBeanSer;
import org.joda.beans.ser.SerCategory;
import org.joda.beans.ser.SerIterator;
import org.joda.beans.ser.SerOptional;
/**
* Stores information on the references in a bean.
*/
final class BeanReferences {
/**
* The settings.
*/
private final JodaBeanSer settings;
/**
* The classes that are being serialized.
*/
private final Map, ClassInfo> classes = new HashMap<>();
/**
* The amount of time each class needs to have its type serialized, linked for stability.
*/
private final Map, Integer> classSerializationCount = new LinkedHashMap<>();
/**
* The sorted class infos.
*/
private final List classInfoList = new ArrayList<>();
/**
* The serialized objects that are repeated and require references.
*/
private final Map refs = new HashMap<>();
// finds
static BeanReferences find(ImmutableBean root, JodaBeanSer settings) {
BeanReferences references = new BeanReferences(settings);
references.findReferences(root);
return references;
}
// creates an instance
private BeanReferences(JodaBeanSer settings) {
this.settings = settings;
}
//-----------------------------------------------------------------------
// finds classes and references within the bean
private void findReferences(ImmutableBean root) {
// handle root bean
classes.put(root.getClass(), classInfoFromMetaBean(root.metaBean()));
classSerializationCount.put(root.getClass(), 1);
// recursively check object graph
Map objects = new LinkedHashMap<>();
findReferencesBean(root, root.getClass(), objects, null);
// build up the list of references, but only for those instances that are repeated
List> refEntries = objects.entrySet().stream()
.sorted(reverseOrder(comparingInt(Map.Entry::getValue)))
.filter(entry -> entry.getValue() > 1)
.collect(toList());
for (Map.Entry entry : refEntries) {
Object value = entry.getKey();
Class realType = value.getClass();
// simple types do not need references
if (realType != Integer.class &&
realType != Double.class &&
realType != Float.class &&
realType != Boolean.class &&
realType != Long.class &&
realType != Short.class &&
realType != Byte.class &&
realType != byte[].class) {
refs.put(value, new Ref(false, refs.size()));
}
}
// reorder classes so the most repeated serialized names have the lowest number (hence the shortest extension)
this.classInfoList.addAll(classSerializationCount.entrySet().stream()
.sorted(reverseOrder(comparingInt(Map.Entry::getValue)))
.map(entry -> classes.get(entry.getKey()))
.collect(toList()));
// adjust the position in the ClassInfo instance
for (int position = 0; position < classInfoList.size(); position++) {
ClassInfo classInfo = classInfoList.get(position);
classInfo.position = position;
}
}
// recursively find the references
private void findReferencesBean(
Object base,
Class declaredClass,
Map objects,
SerIterator parentIterator) {
if (base == null) {
return;
}
// has this object been seen before, if so no need to check it again
int result = objects.compute(base, BeanReferences::incrementOrOne);
if (result > 1) {
return;
}
if (base instanceof Bean) {
addClassInfo(base, declaredClass);
Bean bean = (Bean) base;
if (settings.getConverter().isConvertible(bean.getClass())) {
return;
}
for (MetaProperty prop : bean.metaBean().metaPropertyIterable()) {
if (settings.isSerialized(prop)) {
Object value = prop.get(bean);
Class type = SerOptional.extractType(prop, base.getClass());
if (value != null) {
SerIterator itemIterator = settings.getIteratorFactory().create(value, prop, bean.getClass());
if (itemIterator != null) {
if (itemIterator.metaTypeRequired()) {
objects.compute(itemIterator.metaTypeName(), BeanReferences::incrementOrOne);
}
findReferencesIterable(itemIterator, objects);
} else {
findReferencesBean(value, type, objects, null);
}
}
}
}
} else if (parentIterator != null) {
SerIterator childIterator = settings.getIteratorFactory().createChild(base, parentIterator);
if (childIterator != null) {
findReferencesIterable(childIterator, objects);
} else {
addClassInfo(base, declaredClass);
}
} else {
addClassInfo(base, declaredClass);
}
}
// recursively find the references in an iterable
private void findReferencesIterable(SerIterator itemIterator, Map objects) {
if (itemIterator.category() == SerCategory.MAP) {
while (itemIterator.hasNext()) {
itemIterator.next();
findReferencesBean(itemIterator.key(), itemIterator.keyType(), objects, null);
findReferencesBean(itemIterator.value(), itemIterator.valueType(), objects, itemIterator);
}
} else if (itemIterator.category() == SerCategory.COUNTED) {
while (itemIterator.hasNext()) {
itemIterator.next();
findReferencesBean(itemIterator.value(), itemIterator.valueType(), objects, itemIterator);
}
} else if (itemIterator.category() == SerCategory.TABLE) {
while (itemIterator.hasNext()) {
itemIterator.next();
findReferencesBean(itemIterator.key(), itemIterator.keyType(), objects, null);
findReferencesBean(itemIterator.column(), itemIterator.columnType(), objects, null);
findReferencesBean(itemIterator.value(), itemIterator.valueType(), objects, itemIterator);
}
} else if (itemIterator.category() == SerCategory.GRID) {
while (itemIterator.hasNext()) {
itemIterator.next();
findReferencesBean(itemIterator.value(), itemIterator.valueType(), objects, itemIterator);
}
} else {
while (itemIterator.hasNext()) {
itemIterator.next();
findReferencesBean(itemIterator.value(), itemIterator.valueType(), objects, itemIterator);
}
}
}
// add to list of known classes
private void addClassInfo(Object value, Class declaredClass) {
if (value instanceof Bean && !(value instanceof ImmutableBean)) {
throw new IllegalArgumentException(
"Can only serialize immutable beans in referencing binary format: " + value.getClass().getName());
}
if (value instanceof ImmutableBean) {
boolean isConvertible = settings.getConverter().isConvertible(value.getClass());
boolean noNeedToSerializeTypeName = declaredClass.equals(value.getClass()) &&
(classes.containsKey(value.getClass()) || isConvertible);
if (noNeedToSerializeTypeName) {
return;
}
ImmutableBean bean = (ImmutableBean) value;
// Don't need metaproperty info if it's a convertible type
ClassInfo classInfo = isConvertible ?
new ClassInfo(value.getClass(), new MetaProperty[0]) :
classInfoFromMetaBean(bean.metaBean());
addClassInfoAndIncrementCount(bean.getClass(), classInfo);
} else if (declaredClass == Object.class && !value.getClass().equals(String.class)) {
Class effectiveType = settings.getConverter().findTypedConverter(value.getClass()).getEffectiveType();
ClassInfo classInfo = new ClassInfo(effectiveType, new MetaProperty[0]);
addClassInfoAndIncrementCount(effectiveType, classInfo);
} else if (!settings.getConverter().isConvertible(declaredClass)) {
ClassInfo classInfo = new ClassInfo(value.getClass(), new MetaProperty[0]);
addClassInfoAndIncrementCount(value.getClass(), classInfo);
}
}
// adds the class, incrementing the number of times it is used
private void addClassInfoAndIncrementCount(Class type, ClassInfo classInfo) {
classes.putIfAbsent(type, classInfo);
classSerializationCount.compute(type, BeanReferences::incrementOrOne);
}
// converts a meta-bean to a ClassInfo
private ClassInfo classInfoFromMetaBean(MetaBean metaBean) {
MetaProperty[] metaProperties = StreamSupport.stream(metaBean.metaPropertyIterable().spliterator(), false)
.filter(metaProp -> settings.isSerialized(metaProp))
.toArray(MetaProperty[]::new);
// Positions get recreated when all classes have been recorded
return new ClassInfo(metaBean.beanType(), metaProperties);
}
// Used in Map#compute so we can initialise all the values to one and then increment
private static int incrementOrOne(@SuppressWarnings("unused") Object k, Integer i) {
return i == null ? 1 : Math.addExact(i, 1);
}
//-----------------------------------------------------------------------
// gets the map of references
Map getReferences() {
return refs;
}
List getClassInfoList() {
return classInfoList;
}
// lookup the class info by type
ClassInfo getClassInfo(Class effectiveType) {
ClassInfo classInfo = classes.get(effectiveType);
if (classInfo == null) {
throw new IllegalStateException(
"Tried to serialise class that wasn't present in bean on first pass: " + effectiveType.getName());
}
return classInfo;
}
// CSOFF
//-----------------------------------------------------------------------
// The info needed serialize instances of a class with a reference to the initially serialized class definition
static final class ClassInfo {
// The class itself - not necessary for serialization but here for easier inspection
final Class type;
// The metaproperties (empty if not a bean) in the order in which they need to be serialized
final MetaProperty[] metaProperties;
// The position in the initial class definition list, lower means serialized more often
int position;
private ClassInfo(Class type, MetaProperty[] metaProperties) {
this.type = type;
this.metaProperties = metaProperties;
this.position = -1;
}
@Override
public String toString() {
return "ClassInfo{" +
"position=" + position +
", type=" + type +
", metaProperties=" + Arrays.toString(metaProperties) +
'}';
}
}
//-----------------------------------------------------------------------
// The reference itself (position) plus whether it has previously been serialized
static final class Ref {
boolean hasBeenSerialized;
final int position;
private Ref(boolean hasBeenSerialized, int position) {
this.hasBeenSerialized = hasBeenSerialized;
this.position = position;
}
void sent() {
hasBeenSerialized = true;
}
@Override
public String toString() {
return "Ref{" +
"hasBeenSerialized=" + hasBeenSerialized +
", position=" + position +
'}';
}
}
}
