//
// MessagePack for Java
//
// Copyright (C) 2009-2011 FURUHASHI Sadayuki
//
// 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.msgpack.unpacker;
import java.io.EOFException;
import java.math.BigInteger;
import org.msgpack.MessagePack;
import org.msgpack.MessageTypeException;
import org.msgpack.packer.Unconverter;
import org.msgpack.type.Value;
import org.msgpack.type.ArrayValue;
import org.msgpack.type.MapValue;
public class Converter extends AbstractUnpacker {
private final UnpackerStack stack;
private Object[] values;
protected Value value;
public Converter(Value value) {
this(new MessagePack(), value);
}
public Converter(MessagePack msgpack, Value value) {
super(msgpack);
this.stack = new UnpackerStack();
this.values = new Object[UnpackerStack.MAX_STACK_SIZE];
this.value = value;
}
// FIXME throws IOException?
protected Value nextValue() {
// FIXME EOFError?
throw new NullPointerException("Value is not set");
}
private void ensureValue() {
if(value == null) {
value = nextValue();
}
}
@Override
public boolean tryReadNil() {
stack.checkCount();
if(getTop().isNil()) {
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return true;
}
return false;
}
@Override
public boolean trySkipNil() {
ensureValue();
if(stack.getDepth() > 0 && stack.getTopCount() <= 0) {
// end of array or map
return true;
}
if(getTop().isNil()) {
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return true;
}
return false;
}
@Override
public void readNil() {
if(!getTop().isNil()) {
throw new MessageTypeException("Expected nil but got not nil value");
}
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
}
@Override
public boolean readBoolean() {
boolean v = getTop().asBooleanValue().getBoolean();
stack.reduceCount();
return v;
}
@Override
public byte readByte() {
byte v = getTop().asIntegerValue().getByte();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public short readShort() {
short v = getTop().asIntegerValue().getShort();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public int readInt() {
int v = getTop().asIntegerValue().getInt();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public long readLong() {
long v = getTop().asIntegerValue().getLong();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public BigInteger readBigInteger() {
BigInteger v = getTop().asIntegerValue().getBigInteger();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public float readFloat() {
float v = getTop().asFloatValue().getFloat();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public double readDouble() {
double v = getTop().asFloatValue().getDouble();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return v;
}
@Override
public byte[] readByteArray() {
byte[] raw = getTop().asRawValue().getByteArray();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return raw;
}
@Override
public String readString() {
String str = getTop().asRawValue().getString();
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return str;
}
@Override
public int readArrayBegin() {
Value v = getTop();
if(!v.isArray()) {
throw new MessageTypeException("Expected array but got not array value");
}
ArrayValue a = v.asArrayValue();
stack.reduceCount();
stack.pushArray(a.size());
values[stack.getDepth()] = a.getElementArray();
return a.size();
}
@Override
public void readArrayEnd(boolean check) {
if(!stack.topIsArray()) {
throw new MessageTypeException("readArrayEnd() is called but readArrayBegin() is not called");
}
int remain = stack.getTopCount();
if(remain > 0) {
if(check) {
throw new MessageTypeException("readArrayEnd(check=true) is called but the array is not end");
}
for(int i=0; i < remain; i++) {
skip();
}
}
stack.pop();
if(stack.getDepth() == 0) {
value = null;
}
}
@Override
public int readMapBegin() {
Value v = getTop();
if(!v.isMap()) {
throw new MessageTypeException("Expected map but got not map value");
}
MapValue m = v.asMapValue();
stack.reduceCount();
stack.pushMap(m.size());
values[stack.getDepth()] = m.getKeyValueArray();
return m.size();
}
@Override
public void readMapEnd(boolean check) {
if(!stack.topIsMap()) {
throw new MessageTypeException("readMapEnd() is called but readMapBegin() is not called");
}
int remain = stack.getTopCount();
if(remain > 0) {
if(check) {
throw new MessageTypeException("readMapEnd(check=true) is called but the map is not end");
}
for(int i=0; i < remain; i++) {
skip();
}
}
stack.pop();
if(stack.getDepth() == 0) {
value = null;
}
}
private Value getTop() {
ensureValue();
stack.checkCount();
if(stack.getDepth() == 0) {
//if(stack.getTopCount() < 0) {
// //throw new EOFException(); // TODO
// throw new RuntimeException(new EOFException());
//}
return value;
}
Value[] array = (Value[]) values[stack.getDepth()];
return array[array.length - stack.getTopCount()];
}
@Override
protected void readValue(Unconverter uc) {
if(uc.getResult() != null) {
uc.resetResult();
}
stack.checkCount();
Value v = getTop();
if(!v.isArray() && !v.isMap()) {
uc.write(v);
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
if(uc.getResult() != null) {
return;
}
}
while(true) {
while(stack.getDepth() != 0 && stack.getTopCount() == 0) {
if(stack.topIsArray()) {
uc.writeArrayEnd(true);
stack.pop();
} else if(stack.topIsMap()) {
uc.writeMapEnd(true);
stack.pop();
} else {
throw new RuntimeException("invalid stack"); // FIXME error?
}
if(stack.getDepth() == 0) {
value = null;
}
if(uc.getResult() != null) {
return;
}
}
stack.checkCount();
v = getTop();
if(v.isArray()) {
ArrayValue a = v.asArrayValue();
uc.writeArrayBegin(a.size());
stack.reduceCount();
stack.pushArray(a.size());
values[stack.getDepth()] = a.getElementArray();
} else if(v.isMap()) {
MapValue m = v.asMapValue();
uc.writeMapBegin(m.size());
stack.reduceCount();
stack.pushMap(m.size());
values[stack.getDepth()] = m.getKeyValueArray();
} else {
uc.write(v);
stack.reduceCount();
}
}
}
@Override
public void skip() {
stack.checkCount();
Value v = getTop();
if(!v.isArray() && !v.isMap()) {
stack.reduceCount();
if(stack.getDepth() == 0) {
value = null;
}
return;
}
int targetDepth = stack.getDepth();
while(true) {
while(stack.getTopCount() == 0) {
stack.pop();
if(stack.getDepth() == 0) {
value = null;
}
if(stack.getDepth() <= targetDepth) {
return;
}
}
stack.checkCount();
v = getTop();
if(v.isArray()) {
ArrayValue a = v.asArrayValue();
stack.reduceCount();
stack.pushArray(a.size());
values[stack.getDepth()] = a.getElementArray();
} else if(v.isMap()) {
MapValue m = v.asMapValue();
stack.reduceCount();
stack.pushMap(m.size());
values[stack.getDepth()] = m.getKeyValueArray();
} else {
stack.reduceCount();
}
}
}
public void reset() {
stack.reset();
value = null;
}
}