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Serialization.java
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Serialization.java
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/*******************************************************************************
* Copyright 2010 Cees De Groot, Alex Boisvert, Jan Kotek
*
* 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.apache.jdbm;
import java.io.*;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import static org.apache.jdbm.SerializationHeader.*;
/**
* Serialization util. It reduces serialized data size for most common java types.
* <p/>
* Common pattern is one byte header which identifies data type, then size is written (if required) and
* data.
* <p/>
* On unknown types normal java serialization is used
* <p/>
* <p/>
* Header byte values bellow 180 are reserved by author for future use. If you want to customize
* this class, use values over 180, to be compatible with future updates.
*
* @author Jan Kotek
*/
@SuppressWarnings("unchecked")
public class Serialization extends SerialClassInfo implements Serializer {
/**
* print statistics to STDOUT
*/
static final boolean DEBUG = false;
private static final String UTF8 = "UTF-8";
Serialization(DBAbstract db, long serialClassInfoRecid, ArrayList<ClassInfo> info) throws IOException {
super(db, serialClassInfoRecid,info);
}
public Serialization() {
super(null,0L,new ArrayList<ClassInfo>());
// Add java.lang.Object as registered class
registered.add(new ClassInfo(Object.class.getName(), new FieldInfo[]{},false,false));
}
/**
* Serialize the object into a byte array.
*/
public byte[] serialize(Object obj)
throws IOException {
DataInputOutput ba = new DataInputOutput();
serialize(ba, obj);
return ba.toByteArray();
}
boolean isSerializable(Object obj) {
//TODO suboptimal code
try {
serialize(new DataOutputStream(new ByteArrayOutputStream()), obj);
return true;
} catch (Exception e) {
return false;
}
}
public void serialize(final DataOutput out, final Object obj) throws IOException {
serialize(out, obj, null);
}
public void serialize(final DataOutput out, final Object obj, FastArrayList objectStack) throws IOException {
/**try to find object on stack if it exists*/
if (objectStack != null) {
int indexInObjectStack = objectStack.identityIndexOf(obj);
if (indexInObjectStack != -1) {
//object was already serialized, just write reference to it and return
out.write(OBJECT_STACK);
LongPacker.packInt(out, indexInObjectStack);
return;
}
//add this object to objectStack
objectStack.add(obj);
}
final Class clazz = obj != null ? obj.getClass() : null;
/** first try to serialize object without initializing object stack*/
if (obj == null) {
out.write(NULL);
return;
} else if (clazz == Boolean.class) {
if (((Boolean) obj).booleanValue())
out.write(BOOLEAN_TRUE);
else
out.write(BOOLEAN_FALSE);
return;
} else if (clazz == Integer.class) {
final int val = (Integer) obj;
writeInteger(out, val);
return;
} else if (clazz == Double.class) {
double v = (Double) obj;
if (v == -1d)
out.write(DOUBLE_MINUS_1);
else if (v == 0d)
out.write(DOUBLE_0);
else if (v == 1d)
out.write(DOUBLE_1);
else if (v >= 0 && v <= 255 && (int) v == v) {
out.write(DOUBLE_255);
out.write((int) v);
} else if (v >= Short.MIN_VALUE && v <= Short.MAX_VALUE && (short) v == v) {
out.write(DOUBLE_SHORT);
out.writeShort((int) v);
} else {
out.write(DOUBLE_FULL);
out.writeDouble(v);
}
return;
} else if (clazz == Float.class) {
float v = (Float) obj;
if (v == -1f)
out.write(FLOAT_MINUS_1);
else if (v == 0f)
out.write(FLOAT_0);
else if (v == 1f)
out.write(FLOAT_1);
else if (v >= 0 && v <= 255 && (int) v == v) {
out.write(FLOAT_255);
out.write((int) v);
} else if (v >= Short.MIN_VALUE && v <= Short.MAX_VALUE && (short) v == v) {
out.write(FLOAT_SHORT);
out.writeShort((int) v);
} else {
out.write(FLOAT_FULL);
out.writeFloat(v);
}
return;
} else if (clazz == BigInteger.class) {
out.write(BIGINTEGER);
byte[] buf = ((BigInteger) obj).toByteArray();
serializeByteArrayInt(out, buf);
return;
} else if (clazz == BigDecimal.class) {
out.write(BIGDECIMAL);
BigDecimal d = (BigDecimal) obj;
serializeByteArrayInt(out, d.unscaledValue().toByteArray());
LongPacker.packInt(out, d.scale());
return;
} else if (clazz == Long.class) {
final long val = (Long) obj;
writeLong(out, val);
return;
} else if (clazz == Short.class) {
short val = (Short) obj;
if (val == -1)
out.write(SHORT_MINUS_1);
else if (val == 0)
out.write(SHORT_0);
else if (val == 1)
out.write(SHORT_1);
else if (val > 0 && val < 255) {
out.write(SHORT_255);
out.write(val);
} else {
out.write(SHORT_FULL);
out.writeShort(val);
}
return;
} else if (clazz == Byte.class) {
byte val = (Byte) obj;
if (val == -1)
out.write(BYTE_MINUS_1);
else if (val == 0)
out.write(BYTE_0);
else if (val == 1)
out.write(BYTE_1);
else {
out.write(SHORT_FULL);
out.writeByte(val);
}
return;
} else if (clazz == Character.class) {
out.write(CHAR);
out.writeChar((Character) obj);
return;
} else if (clazz == String.class) {
String s = (String) obj;
if (s.length() == 0) {
out.write(STRING_EMPTY);
} else {
out.write(STRING);
serializeString(out, s);
}
return;
} else if (obj instanceof Class) {
out.write(CLASS);
serialize(out, ((Class) obj).getName());
return;
} else if (obj instanceof int[]) {
writeIntArray(out, (int[]) obj);
return;
} else if (obj instanceof long[]) {
writeLongArray(out, (long[]) obj);
return;
} else if (obj instanceof short[]) {
out.write(SHORT_ARRAY);
short[] a = (short[]) obj;
LongPacker.packInt(out,a.length);
for(short s:a) out.writeShort(s);
return;
} else if (obj instanceof boolean[]) {
out.write(BOOLEAN_ARRAY);
boolean[] a = (boolean[]) obj;
LongPacker.packInt(out,a.length);
for(boolean s:a) out.writeBoolean(s); //TODO pack 8 booleans to single byte
return;
} else if (obj instanceof double[]) {
out.write(DOUBLE_ARRAY);
double[] a = (double[]) obj;
LongPacker.packInt(out,a.length);
for(double s:a) out.writeDouble(s);
return;
} else if (obj instanceof float[]) {
out.write(FLOAT_ARRAY);
float[] a = (float[]) obj;
LongPacker.packInt(out,a.length);
for(float s:a) out.writeFloat(s);
return;
} else if (obj instanceof char[]) {
out.write(CHAR_ARRAY);
char[] a = (char[]) obj;
LongPacker.packInt(out,a.length);
for(char s:a) out.writeChar(s);
return;
} else if (obj instanceof byte[]) {
byte[] b = (byte[]) obj;
out.write(ARRAY_BYTE_INT);
serializeByteArrayInt(out, b);
return;
} else if (clazz == Date.class) {
out.write(DATE);
out.writeLong(((Date) obj).getTime());
return;
} else if (clazz == BTree.class) {
out.write(BTREE);
((BTree) obj).writeExternal(out);
return;
} else if (clazz == HTree.class) {
out.write(HTREE);
((HTree) obj).serialize(out);
return;
} else if (clazz == LinkedList2.class) {
out.write(JDBMLINKEDLIST);
((LinkedList2) obj).serialize(out);
return;
}
/** classes bellow need object stack, so initialize it if not alredy initialized*/
if (objectStack == null) {
objectStack = new FastArrayList();
objectStack.add(obj);
}
if (obj instanceof Object[]) {
Object[] b = (Object[]) obj;
boolean packableLongs = b.length <= 255;
if (packableLongs) {
//check if it contains packable longs
for (Object o : b) {
if (o != null && (o.getClass() != Long.class || (((Long) o).longValue() < 0 && ((Long) o).longValue() != Long.MAX_VALUE))) {
packableLongs = false;
break;
}
}
}
if (packableLongs) {
//packable Longs is special case, it is often used in JDBM to reference fields
out.write(ARRAY_OBJECT_PACKED_LONG);
out.write(b.length);
for (Object o : b) {
if (o == null)
LongPacker.packLong(out, 0);
else
LongPacker.packLong(out, ((Long) o).longValue() + 1);
}
} else {
out.write(ARRAY_OBJECT);
LongPacker.packInt(out, b.length);
// Write class id for components
Class<?> componentType = obj.getClass().getComponentType();
registerClass(componentType);
//write class header
int classId = getClassId(componentType);
LongPacker.packInt(out, classId);
for (Object o : b)
serialize(out, o, objectStack);
}
} else if (clazz == ArrayList.class) {
ArrayList l = (ArrayList) obj;
boolean packableLongs = l.size() < 255;
if (packableLongs) {
//packable Longs is special case, it is often used in JDBM to reference fields
for (Object o : l) {
if (o != null && (o.getClass() != Long.class || (((Long) o).longValue() < 0 && ((Long) o).longValue() != Long.MAX_VALUE))) {
packableLongs = false;
break;
}
}
}
if (packableLongs) {
out.write(ARRAYLIST_PACKED_LONG);
out.write(l.size());
for (Object o : l) {
if (o == null)
LongPacker.packLong(out, 0);
else
LongPacker.packLong(out, ((Long) o).longValue() + 1);
}
} else {
serializeCollection(ARRAYLIST, out, obj, objectStack);
}
} else if (clazz == java.util.LinkedList.class) {
serializeCollection(LINKEDLIST, out, obj, objectStack);
} else if (clazz == Vector.class) {
serializeCollection(VECTOR, out, obj, objectStack);
} else if (clazz == TreeSet.class) {
TreeSet l = (TreeSet) obj;
out.write(TREESET);
LongPacker.packInt(out, l.size());
serialize(out, l.comparator(), objectStack);
for (Object o : l)
serialize(out, o, objectStack);
} else if (clazz == HashSet.class) {
serializeCollection(HASHSET, out, obj, objectStack);
} else if (clazz == LinkedHashSet.class) {
serializeCollection(LINKEDHASHSET, out, obj, objectStack);
} else if (clazz == TreeMap.class) {
TreeMap l = (TreeMap) obj;
out.write(TREEMAP);
LongPacker.packInt(out, l.size());
serialize(out, l.comparator(), objectStack);
for (Object o : l.keySet()) {
serialize(out, o, objectStack);
serialize(out, l.get(o), objectStack);
}
} else if (clazz == HashMap.class) {
serializeMap(HASHMAP, out, obj, objectStack);
} else if (clazz == IdentityHashMap.class) {
serializeMap(IDENTITYHASHMAP, out, obj, objectStack);
} else if (clazz == LinkedHashMap.class) {
serializeMap(LINKEDHASHMAP, out, obj, objectStack);
} else if (clazz == Hashtable.class) {
serializeMap(HASHTABLE, out, obj, objectStack);
} else if (clazz == Properties.class) {
serializeMap(PROPERTIES, out, obj, objectStack);
} else if (clazz == Locale.class){
out.write(LOCALE);
Locale l = (Locale) obj;
out.writeUTF(l.getLanguage());
out.writeUTF(l.getCountry());
out.writeUTF(l.getVariant());
} else {
out.write(NORMAL);
writeObject(out, obj, objectStack);
}
}
static void serializeString(DataOutput out, String obj) throws IOException {
final int len = obj.length();
LongPacker.packInt(out, len);
for (int i = 0; i < len; i++) {
int c = (int) obj.charAt(i); //TODO investigate if c could be negative here
LongPacker.packInt(out, c);
}
}
private void serializeMap(int header, DataOutput out, Object obj, FastArrayList objectStack) throws IOException {
Map l = (Map) obj;
out.write(header);
LongPacker.packInt(out, l.size());
for (Object o : l.keySet()) {
serialize(out, o, objectStack);
serialize(out, l.get(o), objectStack);
}
}
private void serializeCollection(int header, DataOutput out, Object obj, FastArrayList objectStack) throws IOException {
Collection l = (Collection) obj;
out.write(header);
LongPacker.packInt(out, l.size());
for (Object o : l)
serialize(out, o, objectStack);
}
private void serializeByteArrayInt(DataOutput out, byte[] b) throws IOException {
LongPacker.packInt(out, b.length);
out.write(b);
}
private void writeLongArray(DataOutput da, long[] obj) throws IOException {
long max = Long.MIN_VALUE;
long min = Long.MAX_VALUE;
for (long i : obj) {
max = Math.max(max, i);
min = Math.min(min, i);
}
if (0 <= min && max <= 255) {
da.write(ARRAY_LONG_B);
LongPacker.packInt(da, obj.length);
for (long l : obj)
da.write((int) l);
} else if (0 <= min && max <= Long.MAX_VALUE) {
da.write(ARRAY_LONG_PACKED);
LongPacker.packInt(da, obj.length);
for (long l : obj)
LongPacker.packLong(da, l);
} else if (Short.MIN_VALUE <= min && max <= Short.MAX_VALUE) {
da.write(ARRAY_LONG_S);
LongPacker.packInt(da, obj.length);
for (long l : obj)
da.writeShort((short) l);
} else if (Integer.MIN_VALUE <= min && max <= Integer.MAX_VALUE) {
da.write(ARRAY_LONG_I);
LongPacker.packInt(da, obj.length);
for (long l : obj)
da.writeInt((int) l);
} else {
da.write(ARRAY_LONG_L);
LongPacker.packInt(da, obj.length);
for (long l : obj)
da.writeLong(l);
}
}
private void writeIntArray(DataOutput da, int[] obj) throws IOException {
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for (int i : obj) {
max = Math.max(max, i);
min = Math.min(min, i);
}
boolean fitsInByte = 0 <= min && max <= 255;
boolean fitsInShort = Short.MIN_VALUE >= min && max <= Short.MAX_VALUE;
if (obj.length <= 255 && fitsInByte) {
da.write(ARRAY_INT_B_255);
da.write(obj.length);
for (int i : obj)
da.write(i);
} else if (fitsInByte) {
da.write(ARRAY_INT_B_INT);
LongPacker.packInt(da, obj.length);
for (int i : obj)
da.write(i);
} else if (0 <= min && max <= Integer.MAX_VALUE) {
da.write(ARRAY_INT_PACKED);
LongPacker.packInt(da, obj.length);
for (int l : obj)
LongPacker.packInt(da, l);
} else if (fitsInShort) {
da.write(ARRAY_INT_S);
LongPacker.packInt(da, obj.length);
for (int i : obj)
da.writeShort(i);
} else {
da.write(ARRAY_INT_I);
LongPacker.packInt(da, obj.length);
for (int i : obj)
da.writeInt(i);
}
}
private void writeInteger(DataOutput da, final int val) throws IOException {
if (val == -1)
da.write(INTEGER_MINUS_1);
else if (val == 0)
da.write(INTEGER_0);
else if (val == 1)
da.write(INTEGER_1);
else if (val == 2)
da.write(INTEGER_2);
else if (val == 3)
da.write(INTEGER_3);
else if (val == 4)
da.write(INTEGER_4);
else if (val == 5)
da.write(INTEGER_5);
else if (val == 6)
da.write(INTEGER_6);
else if (val == 7)
da.write(INTEGER_7);
else if (val == 8)
da.write(INTEGER_8);
else if (val == Integer.MIN_VALUE)
da.write(INTEGER_MINUS_MAX);
else if (val > 0 && val < 255) {
da.write(INTEGER_255);
da.write(val);
} else if (val < 0) {
da.write(INTEGER_PACK_NEG);
LongPacker.packInt(da, -val);
} else {
da.write(INTEGER_PACK);
LongPacker.packInt(da, val);
}
}
private void writeLong(DataOutput da, final long val) throws IOException {
if (val == -1)
da.write(LONG_MINUS_1);
else if (val == 0)
da.write(LONG_0);
else if (val == 1)
da.write(LONG_1);
else if (val == 2)
da.write(LONG_2);
else if (val == 3)
da.write(LONG_3);
else if (val == 4)
da.write(LONG_4);
else if (val == 5)
da.write(LONG_5);
else if (val == 6)
da.write(LONG_6);
else if (val == 7)
da.write(LONG_7);
else if (val == 8)
da.write(LONG_8);
else if (val == Long.MIN_VALUE)
da.write(LONG_MINUS_MAX);
else if (val > 0 && val < 255) {
da.write(LONG_255);
da.write((int) val);
} else if (val < 0) {
da.write(LONG_PACK_NEG);
LongPacker.packLong(da, -val);
} else {
da.write(LONG_PACK);
LongPacker.packLong(da, val);
}
}
/**
* Deserialize an object from a byte array
*
* @throws IOException
* @throws ClassNotFoundException
*/
public Object deserialize(byte[] buf) throws ClassNotFoundException, IOException {
DataInputOutput bs = new DataInputOutput(buf);
Object ret = deserialize(bs);
if (bs.available() != 0)
throw new InternalError("bytes left: " + bs.available());
return ret;
}
static String deserializeString(DataInput buf) throws IOException {
int len = LongPacker.unpackInt(buf);
char[] b = new char[len];
for (int i = 0; i < len; i++)
b[i] = (char) LongPacker.unpackInt(buf);
return new String(b);
}
public Object deserialize(DataInput is) throws IOException, ClassNotFoundException {
return deserialize(is, null);
}
public Object deserialize(DataInput is, FastArrayList objectStack) throws IOException, ClassNotFoundException {
Object ret = null;
final int head = is.readUnsignedByte();
/** first try to deserialize object without allocating object stack*/
switch (head) {
case NULL:
break;
case BOOLEAN_TRUE:
ret = Boolean.TRUE;
break;
case BOOLEAN_FALSE:
ret = Boolean.FALSE;
break;
case INTEGER_MINUS_1:
ret = Integer.valueOf(-1);
break;
case INTEGER_0:
ret = Integer.valueOf(0);
break;
case INTEGER_1:
ret = Integer.valueOf(1);
break;
case INTEGER_2:
ret = Integer.valueOf(2);
break;
case INTEGER_3:
ret = Integer.valueOf(3);
break;
case INTEGER_4:
ret = Integer.valueOf(4);
break;
case INTEGER_5:
ret = Integer.valueOf(5);
break;
case INTEGER_6:
ret = Integer.valueOf(6);
break;
case INTEGER_7:
ret = Integer.valueOf(7);
break;
case INTEGER_8:
ret = Integer.valueOf(8);
break;
case INTEGER_MINUS_MAX:
ret = Integer.valueOf(Integer.MIN_VALUE);
break;
case INTEGER_255:
ret = Integer.valueOf(is.readUnsignedByte());
break;
case INTEGER_PACK_NEG:
ret = Integer.valueOf(-LongPacker.unpackInt(is));
break;
case INTEGER_PACK:
ret = Integer.valueOf(LongPacker.unpackInt(is));
break;
case LONG_MINUS_1:
ret = Long.valueOf(-1);
break;
case LONG_0:
ret = Long.valueOf(0);
break;
case LONG_1:
ret = Long.valueOf(1);
break;
case LONG_2:
ret = Long.valueOf(2);
break;
case LONG_3:
ret = Long.valueOf(3);
break;
case LONG_4:
ret = Long.valueOf(4);
break;
case LONG_5:
ret = Long.valueOf(5);
break;
case LONG_6:
ret = Long.valueOf(6);
break;
case LONG_7:
ret = Long.valueOf(7);
break;
case LONG_8:
ret = Long.valueOf(8);
break;
case LONG_255:
ret = Long.valueOf(is.readUnsignedByte());
break;
case LONG_PACK_NEG:
ret = Long.valueOf(-LongPacker.unpackLong(is));
break;
case LONG_PACK:
ret = Long.valueOf(LongPacker.unpackLong(is));
break;
case LONG_MINUS_MAX:
ret = Long.valueOf(Long.MIN_VALUE);
break;
case SHORT_MINUS_1:
ret = Short.valueOf((short) -1);
break;
case SHORT_0:
ret = Short.valueOf((short) 0);
break;
case SHORT_1:
ret = Short.valueOf((short) 1);
break;
case SHORT_255:
ret = Short.valueOf((short) is.readUnsignedByte());
break;
case SHORT_FULL:
ret = Short.valueOf(is.readShort());
break;
case BYTE_MINUS_1:
ret = Byte.valueOf((byte) -1);
break;
case BYTE_0:
ret = Byte.valueOf((byte) 0);
break;
case BYTE_1:
ret = Byte.valueOf((byte) 1);
break;
case BYTE_FULL:
ret = Byte.valueOf(is.readByte());
break;
case SHORT_ARRAY:
int size = LongPacker.unpackInt(is);
ret = new short[size];
for(int i=0;i<size;i++) ((short[])ret)[i] = is.readShort();
break;
case BOOLEAN_ARRAY:
size = LongPacker.unpackInt(is);
ret = new boolean[size];
for(int i=0;i<size;i++) ((boolean[])ret)[i] = is.readBoolean();
break;
case DOUBLE_ARRAY:
size = LongPacker.unpackInt(is);
ret = new double[size];
for(int i=0;i<size;i++) ((double[])ret)[i] = is.readDouble();
break;
case FLOAT_ARRAY:
size = LongPacker.unpackInt(is);
ret = new float[size];
for(int i=0;i<size;i++) ((float[])ret)[i] = is.readFloat();
break;
case CHAR_ARRAY:
size = LongPacker.unpackInt(is);
ret = new char[size];
for(int i=0;i<size;i++) ((char[])ret)[i] = is.readChar();
break;
case CHAR:
ret = Character.valueOf(is.readChar());
break;
case FLOAT_MINUS_1:
ret = Float.valueOf(-1);
break;
case FLOAT_0:
ret = Float.valueOf(0);
break;
case FLOAT_1:
ret = Float.valueOf(1);
break;
case FLOAT_255:
ret = Float.valueOf(is.readUnsignedByte());
break;
case FLOAT_SHORT:
ret = Float.valueOf(is.readShort());
break;
case FLOAT_FULL:
ret = Float.valueOf(is.readFloat());
break;
case DOUBLE_MINUS_1:
ret = Double.valueOf(-1);
break;
case DOUBLE_0:
ret = Double.valueOf(0);
break;
case DOUBLE_1:
ret = Double.valueOf(1);
break;
case DOUBLE_255:
ret = Double.valueOf(is.readUnsignedByte());
break;
case DOUBLE_SHORT:
ret = Double.valueOf(is.readShort());
break;
case DOUBLE_FULL:
ret = Double.valueOf(is.readDouble());
break;
case BIGINTEGER:
ret = new BigInteger(deserializeArrayByteInt(is));
break;
case BIGDECIMAL:
ret = new BigDecimal(new BigInteger(deserializeArrayByteInt(is)), LongPacker.unpackInt(is));
break;
case STRING:
ret = deserializeString(is);
break;
case STRING_EMPTY:
ret = Utils.EMPTY_STRING;
break;
case CLASS:
ret = deserializeClass(is);
break;
case DATE:
ret = new Date(is.readLong());
break;
case ARRAY_INT_B_255:
ret = deserializeArrayIntB255(is);
break;
case ARRAY_INT_B_INT:
ret = deserializeArrayIntBInt(is);
break;
case ARRAY_INT_S:
ret = deserializeArrayIntSInt(is);
break;
case ARRAY_INT_I:
ret = deserializeArrayIntIInt(is);
break;
case ARRAY_INT_PACKED:
ret = deserializeArrayIntPack(is);
break;
case ARRAY_LONG_B:
ret = deserializeArrayLongB(is);
break;
case ARRAY_LONG_S:
ret = deserializeArrayLongS(is);
break;
case ARRAY_LONG_I:
ret = deserializeArrayLongI(is);
break;
case ARRAY_LONG_L:
ret = deserializeArrayLongL(is);
break;
case ARRAY_LONG_PACKED:
ret = deserializeArrayLongPack(is);
break;
case ARRAYLIST_PACKED_LONG:
ret = deserializeArrayListPackedLong(is);
break;
case ARRAY_BYTE_INT:
ret = deserializeArrayByteInt(is);
break;
case LOCALE :
ret = new Locale(is.readUTF(),is.readUTF(),is.readUTF());
break;
case JDBMLINKEDLIST:
ret = LinkedList2.deserialize(is, this);
break;
case HTREE:
ret = HTree.deserialize(is,this);
break;
case BTREE:
ret = BTree.readExternal(is,this);
break;
case BTREE_NODE_LEAF:
throw new InternalError("BPage header, wrong serializer used");
case BTREE_NODE_NONLEAF:
throw new InternalError("BPage header, wrong serializer used");
case JAVA_SERIALIZATION:
throw new InternalError("Wrong header, data were probably serialized with OutputStream, not with JDBM serialization");
case -1:
throw new EOFException();
}
if (ret != null || head == NULL) {
if (objectStack != null)
objectStack.add(ret);
return ret;
}
/** something else which needs object stack initialized*/
if (objectStack == null)
objectStack = new FastArrayList();
int oldObjectStackSize = objectStack.size();
switch (head) {
case NORMAL:
ret = readObject(is, objectStack);
break;
case OBJECT_STACK:
ret = objectStack.get(LongPacker.unpackInt(is));
break;
case ARRAYLIST:
ret = deserializeArrayList(is, objectStack);
break;
case ARRAY_OBJECT:
ret = deserializeArrayObject(is, objectStack);
break;
case ARRAY_OBJECT_PACKED_LONG:
ret = deserializeArrayObjectPackedLong(is);
break;
case LINKEDLIST:
ret = deserializeLinkedList(is, objectStack);
break;
case TREESET:
ret = deserializeTreeSet(is, objectStack);
break;
case HASHSET:
ret = deserializeHashSet(is, objectStack);
break;
case LINKEDHASHSET:
ret = deserializeLinkedHashSet(is, objectStack);
break;
case VECTOR:
ret = deserializeVector(is, objectStack);
break;
case TREEMAP:
ret = deserializeTreeMap(is, objectStack);
break;
case HASHMAP:
ret = deserializeHashMap(is, objectStack);
break;
case IDENTITYHASHMAP:
ret = deserializeIdentityHashMap(is, objectStack);
break;
case LINKEDHASHMAP:
ret = deserializeLinkedHashMap(is, objectStack);
break;
case HASHTABLE:
ret = deserializeHashtable(is, objectStack);
break;
case PROPERTIES:
ret = deserializeProperties(is, objectStack);
break;
default:
throw new InternalError("Unknown serialization header: " + head);
}
if (head != OBJECT_STACK && objectStack.size() == oldObjectStackSize) {
//check if object was not already added to stack as part of collection
objectStack.add(ret);
}
return ret;
}
private Class deserializeClass(DataInput is) throws IOException, ClassNotFoundException {
String className = (String) deserialize(is);
Class cls = Class.forName(className);
return cls;
}
private byte[] deserializeArrayByteInt(DataInput is) throws IOException {
int size = LongPacker.unpackInt(is);
byte[] b = new byte[size];
is.readFully(b);
return b;
}
private long[] deserializeArrayLongL(DataInput is) throws IOException {
int size = LongPacker.unpackInt(is);
long[] ret = new long[size];
for (int i = 0; i < size; i++)
ret[i] = is.readLong();
return ret;
}
private long[] deserializeArrayLongI(DataInput is) throws IOException {
int size = LongPacker.unpackInt(is);
long[] ret = new long[size];
for (int i = 0; i < size; i++)
ret[i] = is.readInt();
return ret;
}
private long[] deserializeArrayLongS(DataInput is) throws IOException {
int size = LongPacker.unpackInt(is);
long[] ret = new long[size];
for (int i = 0; i < size; i++)
ret[i] = is.readShort();