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JBoss Marshalling River Implementation
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.marshalling.river;
import java.io.InvalidObjectException;
import org.jboss.marshalling.Unmarshaller;
import org.jboss.marshalling.ByteInput;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.UTFUtils;
import static org.jboss.marshalling.Marshalling.createOptionalDataException;
import java.io.IOException;
import java.io.StreamCorruptedException;
import java.io.EOFException;
/**
*
*/
final class BlockUnmarshaller implements Unmarshaller {
private final RiverUnmarshaller riverUnmarshaller;
private int remaining;
BlockUnmarshaller(final RiverUnmarshaller riverUnmarshaller) {
this.riverUnmarshaller = riverUnmarshaller;
}
boolean inBlock() {
return remaining > 0;
}
int remaining() {
return remaining;
}
void endOfStream() {
if (remaining == 0) {
remaining = -1;
} else {
throw new IllegalStateException("Not at end of block");
}
}
int tempEndOfStream() {
try {
return remaining;
} finally {
remaining = -1;
}
}
void restore(int remaining) {
this.remaining = remaining;
}
void unblock() {
if (remaining == -1) {
remaining = 0;
}
}
void readBlockHeader(int leadByte) throws IOException {
switch (leadByte) {
case Protocol.ID_START_BLOCK_SMALL:
remaining = riverUnmarshaller.readUnsignedByte();
return;
case Protocol.ID_START_BLOCK_MEDIUM:
remaining = riverUnmarshaller.readUnsignedShort();
return;
case Protocol.ID_START_BLOCK_LARGE:
final int len = riverUnmarshaller.readInt();
if (len < 0) {
throw new StreamCorruptedException("Invalid block length");
}
remaining = len;
return;
case Protocol.ID_END_BLOCK_DATA:
remaining = -1;
return;
default:
throw badLeadByte(leadByte);
}
}
void readToEndBlockData() throws IOException, ClassNotFoundException {
for (;;) {
while (remaining > 0) {
skipBytes(remaining);
}
final int b = riverUnmarshaller.read();
switch (b) {
case -1:
remaining = -1;
return;
case Protocol.ID_END_BLOCK_DATA:
remaining = -1;
return;
case Protocol.ID_START_BLOCK_SMALL:
case Protocol.ID_START_BLOCK_MEDIUM:
case Protocol.ID_START_BLOCK_LARGE:
readBlockHeader(b);
break;
default:
// consume object... or whatever
riverUnmarshaller.doReadObject(b, false, true);
break;
}
}
}
private StreamCorruptedException badLeadByte(final int leadByte) {
return new StreamCorruptedException("Unexpected lead byte " + leadByte);
}
public Object readObjectUnshared() throws ClassNotFoundException, IOException {
return readObject(true);
}
public Object readObject() throws ClassNotFoundException, IOException {
return readObject(false);
}
private Object readObject(boolean unshared) throws ClassNotFoundException, IOException {
if (remaining > 0) {
throw createOptionalDataException(remaining);
} else if (remaining == -1) {
throw createOptionalDataException(true);
}
final int leadByte = riverUnmarshaller.read();
if (leadByte == -1 || leadByte == Protocol.ID_END_BLOCK_DATA) {
remaining = -1;
throw createOptionalDataException(true);
}
return riverUnmarshaller.doReadObject(leadByte, unshared, false);
}
public int read() throws IOException {
while (remaining == 0) {
final int v = riverUnmarshaller.read();
if (v == -1) {
return -1;
}
readBlockHeader(v);
}
if (remaining == -1) {
return -1;
}
remaining--;
return riverUnmarshaller.read();
}
public int read(final byte[] b) throws IOException {
return read(b, 0, b.length);
}
public int read(final byte[] b, final int off, final int len) throws IOException {
while (remaining == 0) {
final int v = riverUnmarshaller.read();
if (v == -1) {
return -1;
}
readBlockHeader(v);
}
final int remaining = this.remaining;
if (remaining == -1) {
return -1;
}
final int cnt = riverUnmarshaller.read(b, off, Math.min(remaining, len));
this.remaining = remaining - cnt;
return cnt;
}
public long skip(final long n) throws IOException {
while (remaining == 0) {
final int v = riverUnmarshaller.read();
if (v == -1) {
return -1;
}
readBlockHeader(v);
}
final int remaining = this.remaining;
if (remaining == -1) {
return -1;
}
final int cnt = riverUnmarshaller.skipBytes((int)Math.min((long)remaining, n));
this.remaining = remaining - cnt;
return cnt;
}
public int available() throws IOException {
return Math.min(remaining, riverUnmarshaller.available());
}
public void readFully(final byte[] b) throws IOException {
Marshalling.readFully(this, b);
}
public void readFully(final byte[] b, final int off, final int len) throws IOException {
Marshalling.readFully(this, b, off, len);
}
public int skipBytes(final int n) throws IOException {
while (remaining == 0) {
final int v = riverUnmarshaller.read();
if (v == -1) {
return -1;
}
readBlockHeader(v);
}
final int remaining = this.remaining;
if (remaining == -1) {
return -1;
}
final int cnt = riverUnmarshaller.skipBytes(Math.min(remaining, n));
this.remaining = remaining - cnt;
return cnt;
}
public boolean readBoolean() throws IOException {
while (remaining == 0) {
readBlockHeader(riverUnmarshaller.readUnsignedByte());
}
if (remaining == -1) {
throw new EOFException();
}
remaining--;
return riverUnmarshaller.readBoolean();
}
public byte readByte() throws IOException {
while (remaining == 0) {
readBlockHeader(riverUnmarshaller.readUnsignedByte());
}
if (remaining == -1) {
throw new EOFException();
}
remaining--;
return riverUnmarshaller.readByte();
}
public int readUnsignedByte() throws IOException {
while (remaining == 0) {
readBlockHeader(riverUnmarshaller.readUnsignedByte());
}
if (remaining == -1) {
throw new EOFException();
}
remaining--;
return riverUnmarshaller.readUnsignedByte();
}
public short readShort() throws IOException {
if (remaining < 2) {
return (short) (readUnsignedByte() << 8 | readUnsignedByte());
} else {
remaining -= 2;
return riverUnmarshaller.readShort();
}
}
public int readUnsignedShort() throws IOException {
if (remaining < 2) {
return readUnsignedByte() << 8 | readUnsignedByte();
} else {
remaining -= 2;
return riverUnmarshaller.readUnsignedShort();
}
}
public char readChar() throws IOException {
if (remaining < 2) {
return (char) (readUnsignedByte() << 8 | readUnsignedByte());
} else {
remaining -= 2;
return riverUnmarshaller.readChar();
}
}
public int readInt() throws IOException {
if (remaining < 4) {
return readUnsignedByte() << 24 | readUnsignedByte() << 16 | readUnsignedByte() << 8 | readUnsignedByte();
} else {
remaining -= 4;
return riverUnmarshaller.readInt();
}
}
public long readLong() throws IOException {
if (remaining < 8) {
return (long) readUnsignedByte() << 56L | (long) readUnsignedByte() << 48L | (long) readUnsignedByte() << 40L | (long) readUnsignedByte() << 32L |
(long) readUnsignedByte() << 24L | (long) readUnsignedByte() << 16L | (long) readUnsignedByte() << 8L | (long) readUnsignedByte();
} else {
remaining -= 8;
return riverUnmarshaller.readLong();
}
}
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
public double readDouble() throws IOException {
return Double.longBitsToDouble(readLong());
}
public String readLine() throws IOException {
throw new UnsupportedOperationException("readLine() is deprecated anyway!");
}
public String readUTF() throws IOException {
final int len = readInt();
if (len < 0) {
throw new StreamCorruptedException("Invalid string length");
}
return UTFUtils.readUTFBytes(this, len);
}
public void clearInstanceCache() throws IOException {
throw new IllegalStateException("clearInstanceCache() may not be called in this context");
}
public void clearClassCache() throws IOException {
throw new IllegalStateException("clearClassCache() may not be called in this context");
}
public void start(final ByteInput newInput) throws IOException {
throw new IllegalStateException("start() may not be called in this context");
}
public void finish() throws IOException {
throw new IllegalStateException("finish() may not be called in this context");
}
public void close() throws IOException {
throw new IllegalStateException("close() may not be called in this context");
}
public T readObject(final Class type) throws ClassNotFoundException, IOException {
final Object obj = readObject(false);
try {
return type.cast(obj);
} catch (ClassCastException e) {
throw wrongType(e, type, obj.getClass());
}
}
public T readObjectUnshared(final Class type) throws ClassNotFoundException, IOException {
final Object obj = readObject(true);
try {
return type.cast(obj);
} catch (ClassCastException e) {
throw wrongType(e, type, obj.getClass());
}
}
private static InvalidObjectException wrongType(final ClassCastException e, final Class expected, final Class actual) {
final InvalidObjectException ioe = new InvalidObjectException("Object is of the wrong type (expected " + expected + ", got " + actual + ")");
ioe.initCause(e);
return ioe;
}
}
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