/**
* This file is part of ObjectFabric (http://objectfabric.org).
*
* ObjectFabric is licensed under the Apache License, Version 2.0, the terms
* of which may be found at http://www.apache.org/licenses/LICENSE-2.0.html.
*
* Copyright ObjectFabric Inc.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
package org.objectfabric;
import org.objectfabric.ThreadAssert.SingleThreaded;
@SingleThreaded
class ImmutableReader extends Continuation {
private Buff _buff;
private byte _serializationVersion;
private char[] _chars = new char[16];
private int _charCount;
protected ImmutableReader(List<Object> interruptionStack) {
super(interruptionStack);
}
final Buff getBuff() {
return _buff;
}
final void setBuff(Buff buff) {
_buff = buff;
}
//
void reset() {
if (Debug.COMMUNICATIONS)
ThreadAssert.getOrCreateCurrent().resetReaderDebugCounter(this);
}
void clean() {
_chars = null;
_charCount = 0;
}
private final int remaining() {
/*
* TODO: always say 0 the first time to test all interruption sites.
*/
return _buff.limit() - _buff.position();
}
void startRead() {
_serializationVersion = _buff.getByte();
}
private final boolean getBoolean() {
return _buff.getByte() != 0;
}
/*
* Fixed lengths.
*/
private static final int BYTE_LENGTH = 1;
public final boolean canReadByte() {
int needed = BYTE_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.BYTE_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final byte readByte() {
return readByte(0);
}
public final byte readByte(int tag) {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.BYTE_INDEX, tag);
return _buff.getByte();
}
public final boolean canReadByteBoxed() {
int needed = BOOLEAN_LENGTH + BYTE_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.BYTE_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Byte readByteBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.BYTE_BOXED_INDEX, 0);
if (getBoolean()) {
byte value = _buff.getByte();
return new Byte(value);
}
return null; // Marker Byte
}
//
private static final int BOOLEAN_LENGTH = 1;
public final boolean canReadBoolean() {
int needed = BOOLEAN_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.BOOLEAN_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final boolean readBoolean() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.BOOLEAN_INDEX, 0);
return getBoolean();
}
public final boolean canReadBooleanBoxed() {
int needed = BOOLEAN_LENGTH + BOOLEAN_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.BOOLEAN_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Boolean readBooleanBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.BOOLEAN_BOXED_INDEX, 0);
if (getBoolean())
return new Boolean(getBoolean());
return null; // Marker Boolean
}
//
private static final int SHORT_LENGTH = Short.SIZE / 8;
public final boolean canReadShort() {
int needed = SHORT_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.SHORT_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final short readShort() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.SHORT_INDEX, 0);
return _buff.getShort();
}
public final boolean canReadShortBoxed() {
int needed = BOOLEAN_LENGTH + SHORT_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.SHORT_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Short readShortBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.SHORT_BOXED_INDEX, 0);
if (getBoolean())
return new Short(_buff.getShort());
return null; // Marker Short
}
//
private static final int CHARACTER_LENGTH = Character.SIZE / 8;
public final boolean canReadCharacter() {
int needed = CHARACTER_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.CHARACTER_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final char readCharacter() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.CHARACTER_INDEX, 0);
return _buff.getChar();
}
public final boolean canReadCharacterBoxed() {
int needed = BOOLEAN_LENGTH + CHARACTER_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.CHARACTER_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Character readCharacterBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.CHARACTER_BOXED_INDEX, 0);
if (getBoolean())
return new Character(_buff.getChar());
return null; // Marker Character
}
//
private static final int INTEGER_LENGTH = Integer.SIZE / 8;
public final boolean canReadInteger() {
int needed = INTEGER_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.INTEGER_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final int readInteger() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.INTEGER_INDEX, 0);
return _buff.getInt();
}
public final boolean canReadIntegerBoxed() {
int needed = BOOLEAN_LENGTH + INTEGER_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.INTEGER_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Integer readIntegerBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.INTEGER_BOXED_INDEX, 0);
if (getBoolean())
return new Integer(_buff.getInt());
return null; // Marker Integer
}
//
private static final int LONG_LENGTH = Long.SIZE / 8;
public final boolean canReadLong() {
int needed = LONG_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.LONG_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final long readLong() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.LONG_INDEX, 0);
return _buff.getLong();
}
public final boolean canReadLongBoxed() {
int needed = BOOLEAN_LENGTH + LONG_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.LONG_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Long readLongBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.LONG_BOXED_INDEX, 0);
if (getBoolean())
return new Long(_buff.getLong());
return null; // Marker Long
}
//
private static final int FLOAT_LENGTH = INTEGER_LENGTH;
public final boolean canReadFloat() {
int needed = FLOAT_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.FLOAT_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final float readFloat() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.FLOAT_INDEX, 0);
int value = _buff.getInt();
return Platform.get().intToFloat(value);
}
public final boolean canReadFloatBoxed() {
int needed = BOOLEAN_LENGTH + FLOAT_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.FLOAT_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Float readFloatBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.FLOAT_BOXED_INDEX, 0);
if (getBoolean()) {
int bits = _buff.getInt();
float value = Platform.get().intToFloat(bits);
return new Float(value); // Converter
}
return null; // Marker Float
}
//
private static final int DOUBLE_LENGTH = LONG_LENGTH;
public final boolean canReadDouble() {
int needed = DOUBLE_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.DOUBLE_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final double readDouble() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.DOUBLE_INDEX, 0);
long value = _buff.getLong();
return Platform.get().longToDouble(value);
}
public final boolean canReadDoubleBoxed() {
int needed = BOOLEAN_LENGTH + DOUBLE_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.DOUBLE_BOXED_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final Double readDoubleBoxed() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.DOUBLE_BOXED_INDEX, 0);
if (getBoolean()) {
long bits = _buff.getLong();
double value = Platform.get().longToDouble(bits);
return new Double(value); // Converter
}
return null; // Marker Double
}
//
private static final int DATE_LENGTH = LONG_LENGTH;
public final boolean canReadDate() {
int needed = DATE_LENGTH;
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
Helper.instance().setExpectedClass(Immutable.DATE_INDEX);
needed += ImmutableWriter.DEBUG_OVERHEAD;
}
return remaining() >= needed;
}
public final java.util.Date readDate() {
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
assertDebugInfo(Immutable.DATE_INDEX, 0);
long ticks = _buff.getLong();
if (ticks >= 0)
return new java.util.Date((ticks - 621355968000000000L) / 10000);
return null; // Marker Date
}
/*
* Non fixed lengths.
*/
public final String readString() {
return readString(true, 0);
}
public final String readString(boolean debug, int tag) {
int value;
if (interrupted())
value = resumeInt();
else {
value = Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications() && debug ? -2 : -1;
_charCount = 0;
}
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications() && debug) {
if (value == -2) {
if (!canReadDebugInfo()) {
interruptInt(-2);
return null;
}
Helper.instance().setExpectedClass(Immutable.STRING_INDEX);
assertDebugInfo(Immutable.STRING_INDEX, tag);
}
}
for (;;) {
if (value < 0) {
if (remaining() == 0) {
interruptInt(-1);
return null;
}
value = _buff.getByte() & 0xff;
}
if ((value & ImmutableWriter.STRING_ENC_DOES_NOT_FIT_ON_1_BYTE_MASK) == 0) {
append((char) value);
} else if ((value & ImmutableWriter.STRING_ENC_DOES_NOT_FIT_ON_2_BYTES_MASK) == 0) {
if (remaining() == 0) {
interruptInt(value);
return null;
}
value &= ~ImmutableWriter.STRING_ENC_DOES_NOT_FIT_ON_1_BYTE_MASK;
value = value << 8 | _buff.getByte() & 0xff;
append((char) value);
} else if ((value & ImmutableWriter.STRING_ENC_EOF_MASK) == 0) {
if (remaining() < CHARACTER_LENGTH) {
interruptInt(value);
return null;
}
char c = _buff.getChar();
append(c);
} else if ((value & ImmutableWriter.STRING_ENC_NULL_MASK) == 0)
return new String(_chars, 0, _charCount);
else
return null;
value = -1;
}
}
private final void append(char value) {
if (_charCount >= _chars.length) {
char[] temp = new char[_chars.length << 1];
Platform.arraycopy(_chars, 0, temp, 0, _chars.length);
_chars = temp;
}
_chars[_charCount++] = value;
}
//
public final byte[] readBinary() {
return readBinary(Immutable.BINARY_INDEX);
}
@SuppressWarnings("null")
private final byte[] readBinary(int classId) {
int index = Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications() ? -2 : -1;
byte[] array = null;
if (interrupted()) {
index = resumeInt();
array = (byte[]) resume();
}
if (Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications()) {
if (index == -2) {
if (!canReadDebugInfo()) {
interrupt(null);
interruptInt(-2);
return null;
}
Helper.instance().setExpectedClass(classId);
assertDebugInfo(classId, 0);
}
}
if (index < 0) {
if (remaining() < INTEGER_LENGTH) {
interrupt(null);
interruptInt(-1);
return null;
}
int length = _buff.getInt();
if (length < 0)
return null;
array = new byte[length];
index = 0;
}
// TODO: use get(byte[])
for (; index < array.length; index++) {
if (remaining() == 0) {
interrupt(array);
interruptInt(index);
return null;
}
array[index] = _buff.getByte();
}
return array;
}
//
public final java.math.BigInteger readBigInteger() {
byte[] data = readBinary(Immutable.BIG_INTEGER_INDEX);
if (data != null)
return new java.math.BigInteger(data);
return null; // Marker BigInteger
}
//
public final java.math.BigDecimal readDecimal() {
byte[] a = readBinary(Immutable.DECIMAL_INDEX);
if (a != null) {
byte[] b = new byte[a.length - 4];
Platform.arraycopy(a, 0, b, 0, b.length);
int b0 = a[a.length - 4] & 0x000000ff;
int b1 = (a[a.length - 3] << 8) & 0x0000ff00;
int b2 = (a[a.length - 2] << 16) & 0x00ff0000;
int b3 = (a[a.length - 1] << 24) & 0xff000000;
int scale = b3 | b2 | b1 | b0;
return new java.math.BigDecimal(new java.math.BigInteger(b), scale);
}
return null; // Marker BigDecimal
}
// Debug
public final boolean canReadDebugInfo() {
if (!Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
throw new IllegalStateException();
return remaining() >= ImmutableWriter.DEBUG_OVERHEAD;
}
private final void assertDebugInfo(int classId, int tag) {
if (!Debug.COMMUNICATIONS && ImmutableWriter.getCheckCommunications())
throw new IllegalStateException();
if (Debug.COMMUNICATIONS_LOG_ALL) {
String name = Immutable.ALL.get(classId).toString();
long counter = ThreadAssert.getOrCreateCurrent().getReaderDebugCounter(this);
String c = Platform.get().simpleClassName(this);
Log.write(c + ", " + counter + ", class: " + name + ", tag: " + tag);
}
Debug.assertion(_serializationVersion != 0);
long readDebugCounter = _buff.getLong();
byte readClassId = _buff.getByte();
int readTag = _buff.getInt();
long debugCounter = ThreadAssert.getOrCreateCurrent().getAndIncrementReaderDebugCounter(this);
Debug.assertion(classId == Helper.instance().getExpectedClass());
Debug.assertion(readTag == tag);
Debug.assertion(readClassId == (byte) classId);
Debug.assertion(readDebugCounter == debugCounter);
}
}