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SerialClassInfo.java
499 lines (414 loc) · 15.1 KB
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SerialClassInfo.java
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package net.kotek.jdbm;
import net.kotek.jdbm.Serialization.FastArrayList;
import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This class stores information about serialized classes and fields.
*/
abstract class SerialClassInfo {
static final Serializer<ArrayList<ClassInfo>> serializer = new Serializer<ArrayList<ClassInfo>>() {
public void serialize(DataOutput out, ArrayList<ClassInfo> obj) throws IOException {
LongPacker.packInt(out, obj.size());
for (ClassInfo ci : obj) {
out.writeUTF(ci.getName());
LongPacker.packInt(out, ci.fields.size());
for (FieldInfo fi : ci.fields) {
out.writeUTF(fi.getName());
out.writeBoolean(fi.isPrimitive());
out.writeUTF(fi.getType());
}
}
}
public ArrayList<ClassInfo> deserialize(DataInput in) throws IOException, ClassNotFoundException {
int size = LongPacker.unpackInt(in);
ArrayList<ClassInfo> ret = new ArrayList<ClassInfo>(size);
for (int i = 0; i < size; i++) {
String className = in.readUTF();
int fieldsNum = LongPacker.unpackInt(in);
FieldInfo[] fields = new FieldInfo[fieldsNum];
for (int j = 0; j < fieldsNum; j++) {
fields[j] = new FieldInfo(in.readUTF(), in.readBoolean(), in.readUTF(), Class.forName(className));
}
ret.add(new ClassInfo(className, fields));
}
return ret;
}
};
long serialClassInfoRecid;
public SerialClassInfo(DBAbstract db, long serialClassInfoRecid, ArrayList<ClassInfo> registered){
this.db = db;
this.serialClassInfoRecid = serialClassInfoRecid;
this.registered = registered;
}
/**
* Stores info about single class stored in JDBM.
* Roughly corresponds to 'java.io.ObjectStreamClass'
*/
static class ClassInfo {
private final String name;
private final List<FieldInfo> fields = new ArrayList<FieldInfo>();
private final Map<String, FieldInfo> name2fieldInfo = new HashMap<String, FieldInfo>();
private final Map<String, Integer> name2fieldId = new HashMap<String, Integer>();
private ObjectStreamField[] objectStreamFields;
// Is this class an enumeration?
// 0 - if it is not an enum, 1 - if it is an enum, <0 if not initialized yet
private int isEnum = -1;
ClassInfo(String name, FieldInfo[] fields) {
this.name = name;
for (FieldInfo f : fields) {
this.name2fieldId.put(f.getName(), this.fields.size());
this.fields.add(f);
this.name2fieldInfo.put(f.getName(), f);
}
}
public String getName() {
return name;
}
public FieldInfo[] getFields() {
return (FieldInfo[]) fields.toArray();
}
public FieldInfo getField(String name) {
return name2fieldInfo.get(name);
}
public int getFieldId(String name) {
Integer fieldId = name2fieldId.get(name);
if(fieldId != null)
return fieldId;
return -1;
}
public FieldInfo getField(int serialId) {
return fields.get(serialId);
}
public int addFieldInfo(FieldInfo field) {
name2fieldId.put(field.getName(), fields.size());
name2fieldInfo.put(field.getName(), field);
fields.add(field);
return fields.size() - 1;
}
public ObjectStreamField[] getObjectStreamFields() {
return objectStreamFields;
}
public void setObjectStreamFields(ObjectStreamField[] objectStreamFields) {
this.objectStreamFields = objectStreamFields;
}
public int getEnum() {
return isEnum;
}
public void setEnum(boolean isEnum) {
this.isEnum = isEnum?1:0;
}
}
/**
* Stores info about single field stored in JDBM.
* Roughly corresponds to 'java.io.ObjectFieldClass'
*/
static class FieldInfo {
private final String name;
private final boolean primitive;
private final String type;
private Class typeClass;
// Class containing this field
private final Class clazz;
private Object setter;
private int setterIndex;
private Object getter;
private int getterIndex;
public FieldInfo(String name, boolean primitive, String type, Class clazz) {
this.name = name;
this.primitive = primitive;
this.type = type;
this.clazz = clazz;
try {
this.typeClass = Class.forName(type);
} catch (ClassNotFoundException e) {
this.typeClass = null;
}
initSetter();
initGetter();
}
private void initSetter() {
// Set setter
String setterName = "set" + firstCharCap(name);
String fieldSetterName = clazz.getName() + "#" + setterName;
Class aClazz = clazz;
// iterate over class hierarchy, until root class
while (aClazz != Object.class) {
// check if there is getMethod
try {
Method m = aClazz.getMethod(setterName, typeClass);
if (m != null) {
setter = m;
return;
}
} catch (Exception e) {
// e.printStackTrace();
}
// no get method, access field directly
try {
Field f = aClazz.getDeclaredField(name);
// security manager may not be happy about this
if (!f.isAccessible())
f.setAccessible(true);
setter = f;
return;
} catch (Exception e) {
// e.printStackTrace();
}
// move to superclass
aClazz = aClazz.getSuperclass();
}
}
private void initGetter() {
// Set setter
String getterName = "get" + firstCharCap(name);
String fieldSetterName = clazz.getName() + "#" + getterName;
Class aClazz = clazz;
// iterate over class hierarchy, until root class
while (aClazz != Object.class) {
// check if there is getMethod
try {
Method m = aClazz.getMethod(getterName);
if (m != null) {
getter = m;
return;
}
} catch (Exception e) {
// e.printStackTrace();
}
// no get method, access field directly
try {
Field f = aClazz.getDeclaredField(name);
// security manager may not be happy about this
if (!f.isAccessible())
f.setAccessible(true);
getter = f;
return;
} catch (Exception e) {
// e.printStackTrace();
}
// move to superclass
aClazz = aClazz.getSuperclass();
}
}
public FieldInfo(ObjectStreamField sf, Class clazz) {
this(sf.getName(), sf.isPrimitive(), sf.getType().getName(), clazz);
}
public String getName() {
return name;
}
public boolean isPrimitive() {
return primitive;
}
public String getType() {
return type;
}
private String firstCharCap(String s) {
return Character.toUpperCase(s.charAt(0)) + s.substring(1);
}
}
ArrayList<ClassInfo> registered;
Map<Class, Integer> class2classId = new HashMap<Class, Integer>();
Map<Integer, Class> classId2class = new HashMap<Integer, Class>();
final DBAbstract db;
public void registerClass(Class clazz) throws IOException {
if(clazz != Object.class)
assertClassSerializable(clazz);
if (containsClass(clazz))
return;
ObjectStreamField[] streamFields = getFields(clazz);
FieldInfo[] fields = new FieldInfo[streamFields.length];
for (int i = 0; i < fields.length; i++) {
ObjectStreamField sf = streamFields[i];
fields[i] = new FieldInfo(sf, clazz);
}
ClassInfo i = new ClassInfo(clazz.getName(), fields);
class2classId.put(clazz, registered.size());
classId2class.put(registered.size(), clazz);
registered.add(i);
i.setEnum(clazz.isEnum());
if (db != null)
db.update(serialClassInfoRecid, (Serialization) this, db.defaultSerializationSerializer);
}
private ObjectStreamField[] getFields(Class clazz) {
ObjectStreamField[] fields = null;
ClassInfo classInfo = null;
Integer classId = class2classId.get(clazz);
if (classId != null) {
classInfo = registered.get(classId);
fields = classInfo.getObjectStreamFields();
}
if (fields == null) {
ObjectStreamClass streamClass = ObjectStreamClass.lookup(clazz);
FastArrayList<ObjectStreamField> fieldsList = new FastArrayList<ObjectStreamField>();
while (streamClass != null) {
for (ObjectStreamField f : streamClass.getFields()) {
fieldsList.add(f);
}
clazz = clazz.getSuperclass();
streamClass = ObjectStreamClass.lookup(clazz);
}
fields = new ObjectStreamField[fieldsList
.size()];
for (int i = 0; i < fields.length; i++) {
fields[i] = fieldsList.get(i);
}
if(classInfo != null)
classInfo.setObjectStreamFields(fields);
}
return fields;
}
private void assertClassSerializable(Class clazz) throws NotSerializableException, InvalidClassException {
if(containsClass(clazz))
return;
if (!Serializable.class.isAssignableFrom(clazz))
throw new NotSerializableException(clazz.getName());
}
public Object getFieldValue(String fieldName, Object object) {
try {
registerClass(object.getClass());
} catch (IOException e) {
e.printStackTrace();
}
ClassInfo classInfo = registered.get(class2classId.get(object.getClass()));
return getFieldValue(classInfo.getField(fieldName), object);
}
public Object getFieldValue(FieldInfo fieldInfo, Object object) {
Object fieldAccessor = fieldInfo.getter;
try {
if (fieldAccessor instanceof Method) {
Method m = (Method) fieldAccessor;
return m.invoke(object);
} else {
Field f = (Field) fieldAccessor;
return f.get(object);
}
} catch (Exception e) {
}
throw new NoSuchFieldError(object.getClass() + "." + fieldInfo.getName());
}
public void setFieldValue(String fieldName, Object object, Object value) {
try {
registerClass(object.getClass());
} catch (IOException e) {
e.printStackTrace();
}
ClassInfo classInfo = registered.get(class2classId.get(object.getClass()));
setFieldValue(classInfo.getField(fieldName), object, value);
}
public void setFieldValue(FieldInfo fieldInfo, Object object, Object value) {
Object fieldAccessor = fieldInfo.setter;
try {
if (fieldAccessor instanceof Method) {
Method m = (Method) fieldAccessor;
m.invoke(object, value);
} else {
Field f = (Field) fieldAccessor;
f.set(object, value);
}
return;
} catch (Throwable e) {
e.printStackTrace();
}
throw new NoSuchFieldError(object.getClass() + "." + fieldInfo.getName());
}
public boolean containsClass(Class clazz) {
return (class2classId.get(clazz) != null);
}
public int getClassId(Class clazz) {
Integer classId = class2classId.get(clazz);
if(classId != null) {
return classId;
}
throw new Error("Class is not registered: " + clazz);
}
public void writeObject(DataOutput out, Object obj, FastArrayList objectStack) throws IOException {
registerClass(obj.getClass());
//write class header
int classId = getClassId(obj.getClass());
LongPacker.packInt(out, classId);
ClassInfo classInfo = registered.get(classId);
ObjectStreamField[] fields = getFields(obj.getClass());
if(classInfo.getEnum() > 0) {
int ordinal = ((Enum)obj).ordinal();
LongPacker.packInt(out, ordinal);
}
LongPacker.packInt(out, fields.length);
for (ObjectStreamField f : fields) {
//write field ID
int fieldId = classInfo.getFieldId(f.getName());
if (fieldId == -1) {
//field does not exists in class definition stored in db,
//propably new field was added so add field descriptor
fieldId = classInfo.addFieldInfo(new FieldInfo(f, obj.getClass()));
db.update(serialClassInfoRecid, (Serialization) this, db.defaultSerializationSerializer);
}
LongPacker.packInt(out, fieldId);
//and write value
Object fieldValue = getFieldValue(classInfo.getField(fieldId), obj);
serialize(out, fieldValue, objectStack);
}
}
public Object readObject(DataInput in, FastArrayList objectStack) throws IOException {
//read class header
try {
int classId = LongPacker.unpackInt(in);
ClassInfo classInfo = registered.get(classId);
// Class clazz = Class.forName(classInfo.getName());
Class clazz = classId2class.get(classId);
if(clazz == null)
clazz = Class.forName(classInfo.getName());
assertClassSerializable(clazz);
Object o;
if(classInfo.getEnum() > 0) {
int ordinal = LongPacker.unpackInt(in);
o = clazz.getEnumConstants()[ordinal];
}
else {
o = createInstance(clazz, Object.class);
}
objectStack.add(o);
int fieldCount = LongPacker.unpackInt(in);
for (int i = 0; i < fieldCount; i++) {
int fieldId = LongPacker.unpackInt(in);
FieldInfo f = classInfo.getField(fieldId);
Object fieldValue = deserialize(in, objectStack);
setFieldValue(f, o, fieldValue);
}
return o;
} catch (Exception e) {
throw new Error("Could not instanciate class", e);
}
}
//TODO dependecy on nonpublic JVM API
static private sun.reflect.ReflectionFactory rf =
sun.reflect.ReflectionFactory.getReflectionFactory();
private static Map<Class, Constructor> class2constuctor = new HashMap<Class, Constructor>();
/**
* Little trick to create new instance without using constructor.
* Taken from http://www.javaspecialists.eu/archive/Issue175.html
*/
private static <T> T createInstance(Class<T> clazz, Class<? super T> parent) {
try {
Constructor intConstr = class2constuctor.get(clazz);
if (intConstr == null) {
Constructor objDef = parent.getDeclaredConstructor();
intConstr = rf.newConstructorForSerialization(
clazz, objDef);
class2constuctor.put(clazz, intConstr);
}
return clazz.cast(intConstr.newInstance());
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new IllegalStateException("Cannot create object", e);
}
}
protected abstract Object deserialize(DataInput in, FastArrayList objectStack) throws IOException, ClassNotFoundException;
protected abstract void serialize(DataOutput out, Object fieldValue, FastArrayList objectStack) throws IOException;
}