Package convex.core.data

Class StringShort

java.lang.Object

convex.core.data.AObject

convex.core.data.ACell

convex.core.data.ACountable<CVMChar>

convex.core.data.AString

convex.core.data.StringShort

All Implemented Interfaces:

IValidated, IWriteable, Comparable<AString>

public class StringShort
extends AString

Class representing a short CVM string, backed by a flat Blob USed for most small strings, and acts as the leaf chunk for StringTrees

Field Summary

Fields

Modifier and Type	Field	Description
static final StringShort	EMPTY	The canonical empty String
static final int	MAX_EMBEDDED_STRING_LENGTH	Length of longest StringShort value that is embedded Basically max embedded length minus tag byte and 2-byte length
static final int	MAX_ENCODING_LENGTH
static final int	MAX_LENGTH	Length of longest StringShort value in bytes.

Fields inherited from class convex.core.data.AString

length

Fields inherited from class convex.core.data.ACell

cachedRef, EMPTY_ARRAY

Fields inherited from class convex.core.data.AObject

encoding

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StringShort(byte[] data)
protected	StringShort(byte[] data, int offset, int length)
protected	StringShort(Blob data)

Method Summary

Modifier and Type	Method	Description
protected byte	byteAt(long index)	Gets a byte at the specified index.
int	compareTo(AString o)
static StringShort	create(AArrayBlob b)	Creates a StringShort instance from a Blob of UTF-8 data.
static StringShort	create(String string)	Creates a StringShort instance from a regular Java String
int	encodeRaw(byte[] bs, int pos)	Encode the data of this String.
int	encodeRawData(byte[] bs, int pos)	Encode the raw UTF-8 data of this String.
boolean	equals(ACell a)	Checks for equality with another Cell.
boolean	equals(StringShort a)
int	estimatedEncodingSize()	Estimate the encoded data size for this Cell.
int	getRefCount()	Gets the number of Refs contained within this Cell.
int	intAt(long index)	Gets 32 bytes integer at given position.
boolean	isCanonical()	Returns true if this Cell is in a canonical representation for message writing.
final boolean	isCVMValue()	Returns true if this Cell represents a first class CVM Value.
boolean	isEmbedded()	Determines if this Cell Represents an embedded object.
protected void	printEscaped(BlobBuilder sb, long start, long end)	Prints this string as escaped UTF-8
static AString	read(long length, ByteBuffer bb)	Read a StringShort from a ByteBuffer.
AString	slice(long start, long end)	Gets a slice of this string, or null if not a valid slice
Blob	toBlob()	Converts this String to a Blob byte representation.
ACell	toCanonical()	Converts this Cell to its canonical version.
void	validateCell()	Validates the local structure and invariants of this cell.
protected void	writeToBuffer(ByteBuffer bb)

Methods inherited from class convex.core.data.AString

append, append, charAt, count, empty, encode, get, getElementRef, getTag, getType, hashCode, print, split, toCVMString, toString

Methods inherited from class convex.core.data.ACountable

isEmpty, size, slice

Methods inherited from class convex.core.data.ACell

announce, announce, attachMemorySize, attachRef, cachedEncoding, cachedHash, calcMemorySize, createAnnounced, createEncoding, createPersisted, createPersisted, createRef, equals, getCanonical, getChildRefs, getEncoding, getEncodingLength, getHash, getMemorySize, getRef, getRef, isCompletelyEncoded, mark, mark, updateRefs, validate, write

Methods inherited from class convex.core.data.AObject

attachEncoding, print, print

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

MAX_EMBEDDED_STRING_LENGTH

public static final int MAX_EMBEDDED_STRING_LENGTH

Length of longest StringShort value that is embedded Basically max embedded length minus tag byte and 2-byte length

See Also:

• Constant Field Values

MAX_LENGTH

public static final int MAX_LENGTH

Length of longest StringShort value in bytes. Use Blob as base.

See Also:

• Constant Field Values

MAX_ENCODING_LENGTH

public static final int MAX_ENCODING_LENGTH

EMPTY

public static final StringShort EMPTY

The canonical empty String

Constructor Details

StringShort

protected StringShort(Blob data)

StringShort

protected StringShort(byte[] data)

StringShort

protected StringShort(byte[] data,
 int offset,
 int length)

Method Details

create

public static StringShort create(String string)

Creates a StringShort instance from a regular Java String

Parameters:

string - String to wrap as StringShort

Returns:

StringShort instance, or null if String is of invalid size

create

public static StringShort create(AArrayBlob b)

Creates a StringShort instance from a Blob of UTF-8 data. Shares underlying array.

Parameters:

b - Array Blob to convert to StringShort

Returns:

StringShort instance

byteAt

protected byte byteAt(long index)

Description copied from class: AString

Gets a byte at the specified index. Returns -1 (0xff) if outside String.

Specified by:

byteAt in class AString

Parameters:

index - Index into String (byte position)

Returns:

Raw byte value

intAt

public int intAt(long index)

Description copied from class: AString

Gets 32 bytes integer at given position. Extends with 255 (invalid UTF-8) if needed. The main purpose of this function is to enable fast peeking at UTF-8 characters

Overrides:

intAt in class AString

Parameters:

index - Index into String (byte position)

Returns:

Raw integer value

validateCell

public void validateCell()
                  throws InvalidDataException

Description copied from class: ACell

Validates the local structure and invariants of this cell. Called by validate() super implementation. Should validate directly contained data, but should not validate all other structure of this cell. In particular, should not traverse potentially missing child Refs.

Specified by:

validateCell in class ACell

Throws:

InvalidDataException - If the Cell is invalid

encodeRaw

public int encodeRaw(byte[] bs,
 int pos)

Description copied from class: AString

Encode the data of this String. Assumes tag already written

Specified by:

encodeRaw in class AString

Parameters:

bs - A byte array to which to write the encoding

pos - The offset into the byte array

Returns:

New position after writing

encodeRawData

public int encodeRawData(byte[] bs,
 int pos)

Description copied from class: AString

Encode the raw UTF-8 data of this String. Assumes tag/length already written

Specified by:

encodeRawData in class AString

Parameters:

bs - Byte array to encode to

pos - Position in target array to write to

Returns:

End position in array after encoding

estimatedEncodingSize

public int estimatedEncodingSize()

Description copied from interface: IWriteable

Estimate the encoded data size for this Cell. Used for quickly sizing buffers. Implementations should try to return a size that is likely to contain the entire object when represented in binary format, including the tag byte.

Returns:

The estimated size for the binary representation of this object.

isCanonical

public boolean isCanonical()

Description copied from class: ACell

Returns true if this Cell is in a canonical representation for message writing. Non-canonical objects may be used on a temporary internal basis, they must always be converted to canonical representations for external use (e.g. Encoding).

Specified by:

isCanonical in class ACell

Returns:

true if the object is in canonical format, false otherwise

isCVMValue

public final boolean isCVMValue()

Description copied from class: ACell

Returns true if this Cell represents a first class CVM Value. Sub-structural cells that are not themselves first class values should return false, pretty much everything else should return true. Note: CVM values might not be in a canonical format, e.g. temporary data structures

Specified by:

isCVMValue in class ACell

Returns:

true if the object is a CVM Value, false otherwise

isEmbedded

public boolean isEmbedded()

Description copied from class: ACell

Determines if this Cell Represents an embedded object. Embedded objects are encoded directly into the encoding of the containing Cell (avoiding the need for a hashed reference). Subclasses should override this if they have a cheap O(1) way to determine if they are embedded or otherwise.

Overrides:

isEmbedded in class ACell

Returns:

true if Cell is embedded, false otherwise

getRefCount

public int getRefCount()

Description copied from class: ACell

Gets the number of Refs contained within this Cell. This number is final / immutable for any given instance and is defined by the Cell encoding rules. Contained Refs may be either external or embedded.

Specified by:

getRefCount in class ACell

Returns:

The number of Refs in this Cell

read

public static AString read(long length,
 ByteBuffer bb)

Read a StringShort from a ByteBuffer. Assumes tag and length already read and correct.

Parameters:

length - Length in number of chars to read

bb - ByteBuffer to read from

Returns:

AString instance

toBlob

public Blob toBlob()

Description copied from class: AString

Converts this String to a Blob byte representation. Must round trip all values.

Specified by:

toBlob in class AString

Returns:

Blob representation of UTF-8 String

equals

public boolean equals(ACell a)

Description copied from class: ACell

Checks for equality with another Cell. In general, Cells are considered equal if they have the same canonical representation, i.e. an identical encoding with the same hash value. Subclasses SHOULD override this if they have a more efficient equals implementation. MUST NOT require reads from Store.

Overrides:

equals in class ACell

Parameters:

a - Cell to compare with. May be null.

Returns:

True if this cell is equal to the other object

equals

public boolean equals(StringShort a)

compareTo

public int compareTo(AString o)

Specified by:

compareTo in interface Comparable<AString>

Specified by:

compareTo in class AString

toCanonical

public ACell toCanonical()

Description copied from class: ACell

Converts this Cell to its canonical version. Returns this Cell if already canonical, may be O(n) in size of value otherwise.

Specified by:

toCanonical in class ACell

Returns:

Canonical version of Cell

writeToBuffer

protected void writeToBuffer(ByteBuffer bb)

Specified by:

writeToBuffer in class AString

slice

public AString slice(long start,
 long end)

Description copied from class: AString

Gets a slice of this string, or null if not a valid slice

Specified by:

slice in class AString

Parameters:

start - Start index (inclusive)

end - End index (Exclusive)

Returns:

Specified substring

printEscaped

protected void printEscaped(BlobBuilder sb,
 long start,
 long end)

Description copied from class: AString

Prints this string as escaped UTF-8

Specified by:

printEscaped in class AString