/** This method emits this delta rec to a file */
public void emit(DataOutput out) throws IOException {
DBObjectBase baseDef;
DBObjectBaseField fieldDef;
/* -- */
// write the object id
baseDef = Ganymede.db.getObjectBase(invid.getType());
if (debug) {
System.err.println("Emitting delta rec for invid " + invid.toString());
}
invid.emit(out);
// write the fieldrec count
out.writeInt(fieldRecs.size());
if (debug) {
System.err.println(
"Emitting " + fieldRecs.size() + " field records for invid " + invid.toString());
}
// now let's write out the fields
fieldDeltaRec fdRec;
Object value;
for (int i = 0; i < fieldRecs.size(); i++) {
fdRec = (fieldDeltaRec) fieldRecs.elementAt(i);
// write out our field code.. this will be used by the loader
// code to determine what kind of field this is, and what
// kind of data types need to be loaded.
if (debug) {
System.err.println("Emitting fieldDeltaRec:\n\t" + fdRec.toString());
}
out.writeShort(fdRec.fieldcode);
// are we deleting?
if (!fdRec.vector && fdRec.scalarValue == null) {
// yes, we're deleting this field
out.writeBoolean(true);
continue;
}
// no, we're redefining this field
out.writeBoolean(false);
// write out our field type code.. this will be used by the loader
// to verify that the schema hasn't undergone an incompatible
// change since the journal was written.
fieldDef = (DBObjectBaseField) baseDef.getField(fdRec.fieldcode);
out.writeShort(fieldDef.getType());
if (fdRec.scalarValue != null) {
out.writeBoolean(true); // scalar redefinition
fdRec.scalarValue.emit(out);
continue;
}
out.writeBoolean(false); // vector mod
// write out what is being added to this vector
if (debug) {
System.err.println("====== Emitting " + fdRec.addValues.size() + " addition elements");
}
if (fdRec.addValues == null) {
out.writeInt(0);
} else {
out.writeInt(fdRec.addValues.size());
for (int j = 0; j < fdRec.addValues.size(); j++) {
value = fdRec.addValues.elementAt(j);
// we only support 3 vector field types
if (value instanceof String) {
out.writeUTF((String) value);
} else if (value instanceof Invid) {
((Invid) value).emit(out);
} else if (value instanceof IPwrap) {
Byte[] bytes = ((IPwrap) value).address;
out.writeByte(bytes.length);
for (int k = 0; k < bytes.length; k++) {
out.writeByte(bytes[k].byteValue());
}
} else {
Ganymede.debug("DBObjectDeltaRec.emit(): Error! Unrecognized element in vector!");
}
}
}
// write out what is being removed from this vector
if (fdRec.delValues == null) {
out.writeInt(0);
} else {
out.writeInt(fdRec.delValues.size());
for (int j = 0; j < fdRec.delValues.size(); j++) {
value = fdRec.delValues.elementAt(j);
// we only support 3 vector field types
if (value instanceof String) {
out.writeUTF((String) value);
} else if (value instanceof Invid) {
Invid invid = (Invid) value;
out.writeShort(invid.getType());
out.writeInt(invid.getNum());
} else if (value instanceof IPwrap) {
Byte[] bytes = ((IPwrap) value).address;
out.writeByte(bytes.length);
for (int k = 0; k < bytes.length; k++) {
out.writeByte(bytes[k].byteValue());
}
}
}
}
}
}
/** This DBObjectDeltaRec constructor is used to load a delta record from a Journal stream. */
public DBObjectDeltaRec(DataInput in) throws IOException {
short fieldcode;
short typecode;
boolean scalar;
DBObjectBase baseDef;
DBObjectBaseField fieldDef;
String fieldName = null;
String status = null;
DBObject obj = null;
/* -- */
status = "Reading invid";
boolean debug = true;
try {
invid = Invid.createInvid(in);
baseDef = Ganymede.db.getObjectBase(invid.getType());
obj = Ganymede.db.viewDBObject(invid);
if (debug) {
System.err.println(
"\n>*> Reading delta rec for " + baseDef.getName() + " <" + invid.getNum() + ">");
}
status = "Reading field count";
int fieldcount = in.readInt();
if (debug) {
System.err.println(
">> DBObjectDeltaRec(): " + fieldcount + " fields in on-disk delta rec.");
}
for (int i = 0; i < fieldcount; i++) {
status = "\nReading field code for field " + i;
if (debug) {
System.err.println(status);
}
fieldcode = in.readShort();
fieldDef = (DBObjectBaseField) baseDef.getField(fieldcode);
typecode = fieldDef.getType();
fieldName = fieldDef.getName();
status = "Reading deletion boolean for field " + i;
if (in.readBoolean()) {
// we're deleting this field
if (debug) {
System.err.println(
"Reading field deletion record field ("
+ fieldName
+ ":"
+ fieldcode
+ ") for field "
+ i);
}
fieldRecs.addElement(new fieldDeltaRec(fieldcode, null));
continue;
}
// okay, we've got a field redefinition.. check the type
// code to make sure we don't have an incompatible journal
// entry
status = "Reading type code for field " + i;
if (in.readShort() != typecode) {
throw new RuntimeException("Error, field type mismatch in journal file");
}
// ok.. now, is it a total redefinition, or a vector delta record?
status = "Reading scalar/vector delta boolean for field " + i;
scalar = in.readBoolean();
if (scalar) {
fieldDeltaRec f_r = null;
status = "Reading field (" + fieldName + ":" + fieldcode + ") for field " + i;
if (debug) {
System.err.println(status);
}
f_r = new fieldDeltaRec(fieldcode, DBField.readField(obj, in, fieldDef));
fieldRecs.addElement(f_r);
if (debug) {
System.err.println("Value: " + f_r.toString());
}
} else {
// ok, we have a vector delta chunk
fieldDeltaRec fieldRec = new fieldDeltaRec(fieldcode);
Object value = null;
// read in the additions
status = "Reading vector addition count for field " + fieldName + "(" + i + ")";
if (debug) {
System.err.println(status);
}
int size = in.readInt();
if (debug) {
System.err.println(">> DBObjectDeltaRec(): reading " + size + " additions.");
}
for (int j = 0; j < size; j++) {
// we only support 3 vector field types
switch (typecode) {
case STRING:
status = "Reading string addition " + j + " for field " + i + ":" + fieldName;
if (debug) {
System.err.println(status);
}
value = in.readUTF();
break;
case INVID:
status = "Reading invid addition " + j + " for field " + i + ":" + fieldName;
if (debug) {
System.err.println(status);
}
value = Invid.createInvid(in);
break;
case IP:
status = "Reading ip addition " + j + " for field " + i + ":" + fieldName;
if (debug) {
System.err.println(status);
}
byte bytelength = in.readByte();
Byte[] bytes = new Byte[bytelength];
for (int k = 0; k < bytelength; k++) {
bytes[k] = Byte.valueOf(in.readByte());
}
value = bytes;
}
fieldRec.addValue(value);
}
// read in the deletions
status = "Reading vector deletion count for field " + i;
if (debug) {
System.err.println(status);
}
size = in.readInt();
if (debug) {
System.err.println(">> DBObjectDeltaRec(): reading " + size + " deletions.");
}
for (int j = 0; j < size; j++) {
// we only support 3 vector field types
switch (typecode) {
case STRING:
status = "Reading string deletion " + j + " for field " + i + ":" + fieldName;
value = in.readUTF();
break;
case INVID:
status = "Reading invid deletion " + j + " for field " + i + ":" + fieldName;
value = Invid.createInvid(in);
break;
case IP:
status = "Reading IP deletion " + j + " for field " + i + ":" + fieldName;
byte bytelength = in.readByte();
Byte[] bytes = new Byte[bytelength];
for (int k = 0; k < bytelength; k++) {
bytes[k] = Byte.valueOf(in.readByte());
}
value = bytes;
}
fieldRec.delValue(value);
}
// and save this field
fieldRecs.addElement(fieldRec);
}
}
} catch (IOException ex) {
System.err.println("DBObjectDeltaRec constructor: IOException in state " + status);
Ganymede.logError(ex);
throw ex;
}
}
