Package org.datanucleus.enhancer.asm
Class ByteVector
- java.lang.Object
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- org.datanucleus.enhancer.asm.ByteVector
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public class ByteVector extends java.lang.Object
A dynamically extensible vector of bytes. This class is roughly equivalent to a DataOutputStream on top of a ByteArrayOutputStream, but is more efficient.
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Constructor Summary
Constructors Constructor Description ByteVector()
Constructs a newByteVector
with a default initial capacity.ByteVector(byte[] data)
Constructs a newByteVector
from the given initial data.ByteVector(int initialCapacity)
Constructs a newByteVector
with the given initial capacity.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) ByteVector
encodeUtf8(java.lang.String stringValue, int offset, int maxByteLength)
Puts an UTF8 string into this byte vector.private void
enlarge(int size)
Enlarges this byte vector so that it can receive 'size' more bytes.(package private) ByteVector
put11(int byteValue1, int byteValue2)
Puts two bytes into this byte vector.(package private) ByteVector
put112(int byteValue1, int byteValue2, int shortValue)
Puts two bytes and a short into this byte vector.(package private) ByteVector
put12(int byteValue, int shortValue)
Puts a byte and a short into this byte vector.(package private) ByteVector
put122(int byteValue, int shortValue1, int shortValue2)
Puts one byte and two shorts into this byte vector.ByteVector
putByte(int byteValue)
Puts a byte into this byte vector.ByteVector
putByteArray(byte[] byteArrayValue, int byteOffset, int byteLength)
Puts an array of bytes into this byte vector.ByteVector
putInt(int intValue)
Puts an int into this byte vector.ByteVector
putLong(long longValue)
Puts a long into this byte vector.ByteVector
putShort(int shortValue)
Puts a short into this byte vector.ByteVector
putUTF8(java.lang.String stringValue)
Puts an UTF8 string into this byte vector.int
size()
Returns the actual number of bytes in this vector.
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Field Detail
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data
byte[] data
The content of this vector. Only the firstlength
bytes contain real data.
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length
int length
The actual number of bytes in this vector.
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Constructor Detail
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ByteVector
public ByteVector()
Constructs a newByteVector
with a default initial capacity.
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ByteVector
public ByteVector(int initialCapacity)
Constructs a newByteVector
with the given initial capacity.- Parameters:
initialCapacity
- the initial capacity of the byte vector to be constructed.
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ByteVector
ByteVector(byte[] data)
Constructs a newByteVector
from the given initial data.- Parameters:
data
- the initial data of the new byte vector.
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Method Detail
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size
public int size()
Returns the actual number of bytes in this vector.- Returns:
- the actual number of bytes in this vector.
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putByte
public ByteVector putByte(int byteValue)
Puts a byte into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteValue
- a byte.- Returns:
- this byte vector.
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put11
final ByteVector put11(int byteValue1, int byteValue2)
Puts two bytes into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteValue1
- a byte.byteValue2
- another byte.- Returns:
- this byte vector.
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putShort
public ByteVector putShort(int shortValue)
Puts a short into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
shortValue
- a short.- Returns:
- this byte vector.
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put12
final ByteVector put12(int byteValue, int shortValue)
Puts a byte and a short into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteValue
- a byte.shortValue
- a short.- Returns:
- this byte vector.
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put112
final ByteVector put112(int byteValue1, int byteValue2, int shortValue)
Puts two bytes and a short into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteValue1
- a byte.byteValue2
- another byte.shortValue
- a short.- Returns:
- this byte vector.
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putInt
public ByteVector putInt(int intValue)
Puts an int into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
intValue
- an int.- Returns:
- this byte vector.
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put122
final ByteVector put122(int byteValue, int shortValue1, int shortValue2)
Puts one byte and two shorts into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteValue
- a byte.shortValue1
- a short.shortValue2
- another short.- Returns:
- this byte vector.
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putLong
public ByteVector putLong(long longValue)
Puts a long into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
longValue
- a long.- Returns:
- this byte vector.
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putUTF8
public ByteVector putUTF8(java.lang.String stringValue)
Puts an UTF8 string into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
stringValue
- a String whose UTF8 encoded length must be less than 65536.- Returns:
- this byte vector.
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encodeUtf8
final ByteVector encodeUtf8(java.lang.String stringValue, int offset, int maxByteLength)
Puts an UTF8 string into this byte vector. The byte vector is automatically enlarged if necessary. The string length is encoded in two bytes before the encoded characters, if there is space for that (i.e. if this.length - offset - 2 >= 0).- Parameters:
stringValue
- the String to encode.offset
- the index of the first character to encode. The previous characters are supposed to have already been encoded, using only one byte per character.maxByteLength
- the maximum byte length of the encoded string, including the already encoded characters.- Returns:
- this byte vector.
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putByteArray
public ByteVector putByteArray(byte[] byteArrayValue, int byteOffset, int byteLength)
Puts an array of bytes into this byte vector. The byte vector is automatically enlarged if necessary.- Parameters:
byteArrayValue
- an array of bytes. May be null to putbyteLength
null bytes into this byte vector.byteOffset
- index of the first byte of byteArrayValue that must be copied.byteLength
- number of bytes of byteArrayValue that must be copied.- Returns:
- this byte vector.
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enlarge
private void enlarge(int size)
Enlarges this byte vector so that it can receive 'size' more bytes.- Parameters:
size
- number of additional bytes that this byte vector should be able to receive.
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