org.redkale.convert.bson.BsonReader Maven / Gradle / Ivy
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*/
package org.redkale.convert.bson;
import org.redkale.convert.*;
import static org.redkale.convert.Reader.SIGN_NULL;
import org.redkale.convert.ext.*;
import org.redkale.util.*;
/**
* BSON数据源
*
*
* 详情见: https://redkale.org
*
* @author zhangjx
*/
public class BsonReader extends Reader {
public static final short SIGN_OBJECTB = (short) 0xBB;
public static final short SIGN_OBJECTE = (short) 0xEE;
public static final byte SIGN_HASNEXT = 1;
public static final byte SIGN_NONEXT = 0;
public static final byte VERBOSE_NO = 1;
public static final byte VERBOSE_YES = 2;
protected byte typeval; //字段的类型值 对应 BsonWriter.writeField
protected int position = -1;
private byte[] content;
public BsonReader() {
}
public static ObjectPool createPool(int max) {
return new ObjectPool<>(max, (Object... params) -> new BsonReader(), null, (t) -> t.recycle());
}
public BsonReader(byte[] bytes) {
setBytes(bytes, 0, bytes.length);
}
public BsonReader(byte[] bytes, int start, int len) {
setBytes(bytes, start, len);
}
public final void setBytes(byte[] bytes) {
if (bytes == null) {
this.position = 0;
} else {
setBytes(bytes, 0, bytes.length);
}
}
public final void setBytes(byte[] bytes, int start, int len) {
if (bytes == null) {
this.position = 0;
} else {
this.content = bytes;
this.position = start - 1;
//this.limit = start + len - 1;
}
}
protected boolean recycle() {
this.position = -1;
this.typeval = 0;
//this.limit = -1;
this.content = null;
return true;
}
public void close() {
this.recycle();
}
/**
* 跳过属性的值
*/
@Override
@SuppressWarnings("unchecked")
public final void skipValue() {
if (typeval == 0) return;
final byte val = this.typeval;
this.typeval = 0;
switch (val) {
case 1: readBoolean();
break;
case 2: readByte();
break;
case 3: readShort();
break;
case 4: readChar();
break;
case 5: readInt();
break;
case 6: readLong();
break;
case 7: readFloat();
break;
case 8: readDouble();
break;
case 9: readString();
break;
case 101:
BoolArraySimpledCoder.instance.convertFrom(this);
break;
case 102:
ByteArraySimpledCoder.instance.convertFrom(this);
break;
case 103:
ShortArraySimpledCoder.instance.convertFrom(this);
break;
case 104:
CharArraySimpledCoder.instance.convertFrom(this);
break;
case 105:
IntArraySimpledCoder.instance.convertFrom(this);
break;
case 106:
LongArraySimpledCoder.instance.convertFrom(this);
break;
case 107:
FloatArraySimpledCoder.instance.convertFrom(this);
break;
case 108:
DoubleArraySimpledCoder.instance.convertFrom(this);
break;
case 109:
StringArraySimpledCoder.instance.convertFrom(this);
break;
case 127:
BsonFactory.objectDecoder.convertFrom(this);
break;
}
}
@Override
public final String readObjectB(final Class clazz) {
this.fieldIndex = 0; //必须要重置为0
final String newcls = readClassName();
if (newcls != null && !newcls.isEmpty()) return newcls;
short bt = readShort();
if (bt == Reader.SIGN_NULL) return null;
if (bt != SIGN_OBJECTB) {
throw new ConvertException("a bson object must begin with " + (SIGN_OBJECTB)
+ " (position = " + position + ") but '" + currentByte() + "'");
}
return "";
}
@Override
public final void readObjectE(final Class clazz) {
if (readShort() != SIGN_OBJECTE) {
throw new ConvertException("a bson object must end with " + (SIGN_OBJECTE)
+ " (position = " + position + ") but '" + currentByte() + "'");
}
}
protected byte currentByte() {
return this.content[this.position];
}
@Override
public final int readMapB(DeMember member, Decodeable keydecoder) {
return readArrayB(member, keydecoder);
}
@Override
public final void readMapE() {
}
/**
* 判断下一个非空白字节是否为[
*
* @return 数组长度或SIGN_NULL
*/
@Override
public int readArrayB(DeMember member, Decodeable decoder) {
short bt = readShort();
if (bt == Reader.SIGN_NULL) return bt;
return (bt & 0xffff) << 16 | ((content[++this.position] & 0xff) << 8) | (content[++this.position] & 0xff);
}
@Override
public final void readArrayE() {
}
/**
* 判断下一个非空白字节是否:
*/
@Override
public final void readBlank() {
}
@Override
public int position() {
return this.position;
}
@Override
public int readMemberContentLength(DeMember member, Decodeable decoder) {
return -1;
}
/**
* 判断对象是否存在下一个属性或者数组是否存在下一个元素
*
* @param startPosition 起始位置
* @param contentLength 内容大小， 不确定的传-1
*
* @return 是否存在
*/
@Override
public boolean hasNext(int startPosition, int contentLength) {
byte b = readByte();
if (b == SIGN_HASNEXT) return true;
if (b != SIGN_NONEXT) throw new ConvertException("hasNext option must be (" + (SIGN_HASNEXT)
+ " or " + (SIGN_NONEXT) + ") but '" + b + "' at position(" + this.position + ")");
return false;
}
@Override
public final DeMember readFieldName(final DeMember[] members) {
final String exceptedfield = readSmallString();
this.typeval = readByte();
final int len = members.length;
if (this.fieldIndex >= len) this.fieldIndex = 0;
for (int k = this.fieldIndex; k < len; k++) {
if (exceptedfield.equals(members[k].getAttribute().field())) {
this.fieldIndex = k;
return members[k];
}
}
for (int k = 0; k < this.fieldIndex; k++) {
if (exceptedfield.equals(members[k].getAttribute().field())) {
this.fieldIndex = k;
return members[k];
}
}
return null;
}
//------------------------------------------------------------
@Override
public boolean readBoolean() {
return content[++this.position] == 1;
}
@Override
public byte readByte() {
return content[++this.position];
}
@Override
public final byte[] readByteArray() {
int len = readArrayB(null, null);
int contentLength = -1;
if (len == Reader.SIGN_NULL) return null;
if (len == Reader.SIGN_NOLENBUTBYTES) {
contentLength = readMemberContentLength(null, null);
len = Reader.SIGN_NOLENGTH;
}
if (len == Reader.SIGN_NOLENGTH) {
int size = 0;
byte[] data = new byte[8];
int startPosition = position();
while (hasNext(startPosition, contentLength)) {
if (size >= data.length) {
byte[] newdata = new byte[data.length + 4];
System.arraycopy(data, 0, newdata, 0, size);
data = newdata;
}
data[size++] = readByte();
}
readArrayE();
byte[] newdata = new byte[size];
System.arraycopy(data, 0, newdata, 0, size);
return newdata;
} else {
byte[] values = new byte[len];
for (int i = 0; i < values.length; i++) {
values[i] = readByte();
}
readArrayE();
return values;
}
}
@Override
public char readChar() {
return (char) ((0xff00 & (content[++this.position] << 8)) | (0xff & content[++this.position]));
}
@Override
public short readShort() {
return (short) ((0xff00 & (content[++this.position] << 8)) | (0xff & content[++this.position]));
}
@Override
public int readInt() {
return ((content[++this.position] & 0xff) << 24) | ((content[++this.position] & 0xff) << 16)
| ((content[++this.position] & 0xff) << 8) | (content[++this.position] & 0xff);
}
@Override
public long readLong() {
return ((((long) content[++this.position] & 0xff) << 56)
| (((long) content[++this.position] & 0xff) << 48)
| (((long) content[++this.position] & 0xff) << 40)
| (((long) content[++this.position] & 0xff) << 32)
| (((long) content[++this.position] & 0xff) << 24)
| (((long) content[++this.position] & 0xff) << 16)
| (((long) content[++this.position] & 0xff) << 8)
| (((long) content[++this.position] & 0xff)));
}
@Override
public final float readFloat() {
return Float.intBitsToFloat(readInt());
}
@Override
public final double readDouble() {
return Double.longBitsToDouble(readLong());
}
@Override
public final String readClassName() {
return readSmallString();
}
@Override
public String readSmallString() {
int len = 0xff & readByte();
if (len == 0) return "";
String value = new String(content, ++this.position, len);
this.position += len - 1; //上一行已经++this.position，所以此处要-1
return value;
}
@Override
public String readString() {
int len = readInt();
if (len == SIGN_NULL) return null;
if (len == 0) return "";
String value = new String(Utility.decodeUTF8(content, ++this.position, len));
this.position += len - 1;//上一行已经++this.position，所以此处要-1
return value;
}
}