private static Object readValue(InputStream is, ClassLoader loader) throws Exception {
byte type = (byte) is.read();
if (type == -1) {
return null;
}
Class vClass = null;
if (type == 2) {
int length = PDataStream.readInt(is);
Vector v = new Vector(length);
for (int i = 0; i < length; i++) {
v.insertElementAt(readValue(is, loader), i);
}
return v;
} else if (type == 0) {
return readRealObject((byte) is.read(), is, loader);
} else {
int length = PDataStream.readInt(is);
boolean primitive = PDataStream.readBoolean(is);
if (primitive) {
return readPrimitiveArray(length, is);
}
vClass =
loader == null
? Class.forName(PDataStream.readUTF(is))
: loader.loadClass(PDataStream.readUTF(is));
Object array = Array.newInstance(vClass, length);
for (int i = 0; i < length; i++) {
Array.set(array, i, readValue(is, loader));
}
return array;
}
}
/**
* Writes this object to the stream passed. The object can be loaded again via its readObject
* method.
*
* @param os strream to write data to.
* @exception Exception if error of any kind occurs
*/
public synchronized void writeObject(OutputStream os) throws Exception {
Enumeration keys = keys();
Enumeration values = elements();
PDataStream.writeInt(size(), os);
// dictionary is never empty:
// it either has elements or is null
while (keys.hasMoreElements()) {
PDataStream.writeUTF((String) keys.nextElement(), os);
writeValue(values.nextElement(), os);
}
}
/**
* Reads the data from the InputStream and loads the data in the table.
*
* @param is stream to read dictionary's data from
* @exception Exception if an error of any kind occurs while reading
*/
public synchronized void readObject(InputStream is) throws Exception {
try {
int size = PDataStream.readInt(is);
if (table == null) {
if (size > 0) {
initTable(size);
} else initTable(MIN_CAPACITY);
}
for (int i = 0; i < size; i++) {
put(PDataStream.readUTF(is), readValue(is, loader));
}
} catch (Exception e) {
throw e;
}
}
private static Object readRealObject(byte type, InputStream is, ClassLoader loader)
throws IOException {
try {
if (type == 0) {
return PDataStream.readUTF(is);
} else if (type == 1) {
return new Integer(PDataStream.readInt(is));
} else if (type == 2) {
return new Long(PDataStream.readLong(is));
} else if (type == 3) {
return new Byte((byte) is.read());
} else if (type == 4) {
return PDataStream.readBoolean(is) ? Boolean.TRUE : Boolean.FALSE;
} else if (type == 5) {
return new Character(PDataStream.readChar(is));
} else if (type == 6) {
return new Short(PDataStream.readShort(is));
} else if (type == 7) {
return new Float(PDataStream.readFloat(is));
} else if (type == 8) {
return new Double(PDataStream.readDouble(is));
} else if (type == 11) {
String name = PDataStream.readUTF(is);
Class c = loader == null ? Class.forName(name) : loader.loadClass(name);
if (Externalizable.class.isAssignableFrom(c)) {
Externalizable obj = (Externalizable) c.newInstance();
obj.readObject(is);
return obj;
}
throw new IOException("Could not read object " + name);
} else if (type == 12) {
ObjectInputStream in =
loader == null
? new ObjectInputStream(is)
: (ObjectInputStream) new XObjectInputStream(loader, is);
return in.readObject();
}
} catch (ClassNotFoundException cnfe) {
throw new IOException("Could not find class " + cnfe.toString());
} catch (Exception exc) {
throw exc instanceof IOException
? (IOException) exc
: new IOException("Could not read object " + exc.toString());
}
throw new IllegalArgumentException("Unsupported Typed Object: " + type);
}
// only if this is an object (not primitive) and non null!
private static void writeRealObject(Object value, Class vClass, OutputStream os)
throws IOException {
try {
if (vClass.equals(String.class)) {
os.write(0);
PDataStream.writeUTF((String) value, os);
} else if (vClass.equals(Integer.class)) {
os.write(1);
PDataStream.writeInt(((Integer) value).intValue(), os);
} else if (vClass.equals(Long.class)) {
os.write(2);
PDataStream.writeLong(((Long) value).longValue(), os);
} else if (vClass.equals(Byte.class)) {
os.write(3);
os.write(((Byte) value).byteValue());
} else if (vClass.equals(Boolean.class)) {
os.write(4);
PDataStream.writeBoolean(((Boolean) value).booleanValue(), os);
} else if (vClass.equals(Character.class)) {
os.write(5);
PDataStream.writeChar(((Character) value).charValue(), os);
} else if (vClass.equals(Short.class)) {
os.write(6);
PDataStream.writeShort(((Short) value).shortValue(), os);
} else if (vClass.equals(Float.class)) {
os.write(7);
PDataStream.writeFloat(((Float) value).floatValue(), os);
} else if (vClass.equals(Double.class)) {
os.write(8);
PDataStream.writeDouble(((Double) value).doubleValue(), os);
} else if (Externalizable.class.isAssignableFrom(vClass)) {
os.write(11);
String name = vClass.getName();
PDataStream.writeUTF(name, os);
Externalizable tmp = (Externalizable) value;
tmp.writeObject(os);
} else {
os.write(12);
ObjectOutputStream out = new ObjectOutputStream(os);
out.writeObject(value);
}
} catch (Exception exc) {
throw new IOException(exc.toString());
}
}
private static void writeValue(Object value, OutputStream os) throws IOException {
if (value == null) {
os.write(-1);
} else {
Class valueClass = value.getClass();
// write 0 for a single value, 1 for array, and 2 for Vector
if (valueClass.isArray()) {
os.write(1);
int length = Array.getLength(value);
PDataStream.writeInt(length, os);
Class componentType = valueClass.getComponentType();
if (componentType.isPrimitive()) {
// primitive
PDataStream.writeBoolean(true, os);
// 1: int;2: long; 3: byte; 4: boolean; 5: character; 6:
// short; 7: float; 8: double
writePrimitiveArray(componentType, value, length, os);
} else {
PDataStream.writeBoolean(false, os);
PDataStream.writeUTF(componentType.getName(), os);
Object[] oArr = (Object[]) value;
for (int i = 0; i < length; i++) {
writeValue(oArr[i], os);
}
}
} else if (valueClass.equals(Vector.class)) {
os.write(2);
int size = ((Vector) value).size();
PDataStream.writeInt(size, os);
for (int i = 0; i < size; i++) {
writeValue(((Vector) value).elementAt(i), os);
}
} else {
os.write(0);
writeRealObject(value, valueClass, os);
}
}
}
private static Object readPrimitiveArray(int length, InputStream is) throws IOException {
byte type = (byte) is.read();
if (type == 1) {
int[] ints = new int[length];
for (int i = 0; i < length; i++) {
ints[i] = PDataStream.readInt(is);
}
return ints;
} else if (type == 2) {
long[] longs = new long[length];
for (int i = 0; i < length; i++) {
longs[i] = PDataStream.readLong(is);
}
return longs;
} else if (type == 3) {
byte[] bytes = new byte[length];
is.read(bytes);
return bytes;
} else if (type == 4) {
boolean[] booleans = new boolean[length];
for (int i = 0; i < length; i++) {
booleans[i] = PDataStream.readBoolean(is);
}
return booleans;
} else if (type == 5) {
char[] chars = new char[length];
for (int i = 0; i < length; i++) {
chars[i] = PDataStream.readChar(is);
}
return chars;
} else if (type == 6) {
short[] shorts = new short[length];
for (int i = 0; i < length; i++) {
shorts[i] = PDataStream.readShort(is);
}
return shorts;
} else if (type == 7) {
float[] floats = new float[length];
for (int i = 0; i < length; i++) {
floats[i] = PDataStream.readFloat(is);
}
return floats;
} else if (type == 8) {
double[] doubles = new double[length];
for (int i = 0; i < length; i++) {
doubles[i] = PDataStream.readDouble(is);
}
return doubles;
} else {
throw new IllegalArgumentException("Trying to read unsupported primitive type: " + type);
}
}
// 1: int;2: long; 3: byte; 4: boolean; 5: character;
// 6: short; 7: float; 8: double
private static void writePrimitiveArray(
Class componentType, Object array, int length, OutputStream os) throws IOException {
if (componentType.equals(Integer.TYPE)) {
int[] ints = (int[]) array;
os.write(1);
for (int i = 0; i < length; i++) {
PDataStream.writeInt(ints[i], os);
}
} else if (componentType.equals(Long.TYPE)) {
os.write(2);
long[] longs = (long[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeLong(longs[i], os);
}
} else if (componentType.equals(Byte.TYPE)) {
os.write(3);
os.write((byte[]) array);
} else if (componentType.equals(Boolean.TYPE)) {
os.write(4);
boolean[] booleans = (boolean[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeBoolean(booleans[i], os);
}
} else if (componentType.equals(Character.TYPE)) {
os.write(5);
char[] chars = (char[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeChar(chars[i], os);
}
} else if (componentType.equals(Short.TYPE)) {
os.write(6);
short[] shorts = (short[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeShort(shorts[i], os);
}
} else if (componentType.equals(Float.TYPE)) {
os.write(7);
float[] floats = (float[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeFloat(floats[i], os);
}
} else if (componentType.equals(Double.TYPE)) {
os.write(8);
double[] doubles = (double[]) array;
for (int i = 0; i < length; i++) {
PDataStream.writeDouble(doubles[i], os);
}
} else {
throw new IllegalArgumentException("Unsupported Primitive Type: " + componentType);
}
}