java.lang.Object
- org.h2.mvstore.DataUtils

public final class DataUtils
extends java.lang.Object

Utility methods

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`COMPRESSED_VAR_INT_MAX`	The maximum integer that needs less space when using variable size encoding (only 3 bytes instead of 4).
`static long`	`COMPRESSED_VAR_LONG_MAX`	The maximum long that needs less space when using variable size encoding (only 7 bytes instead of 8).
`static int`	`ERROR_BLOCK_NOT_FOUND`	The block in the stream store was not found.
`static int`	`ERROR_CHUNK_NOT_FOUND`	The application was trying to read data from a chunk that is no longer available.
`static int`	`ERROR_CLOSED`	The object is already closed.
`static int`	`ERROR_FILE_CORRUPT`	The file is corrupt or (for encrypted files) the encryption key is wrong.
`static int`	`ERROR_FILE_LOCKED`	The file is locked.
`static int`	`ERROR_INTERNAL`	An internal error occurred.
`static int`	`ERROR_READING_FAILED`	An error occurred while reading from the file.
`static int`	`ERROR_SERIALIZATION`	An error occurred when serializing or de-serializing.
`static int`	`ERROR_TOO_MANY_OPEN_TRANSACTIONS`	There are too many open transactions.
`static int`	`ERROR_TRANSACTION_CORRUPT`	The transaction store is corrupt.
`static int`	`ERROR_TRANSACTION_ILLEGAL_STATE`	The transaction store is in an illegal state (for example, not yet initialized).
`static int`	`ERROR_TRANSACTION_LOCKED`	An entry is still locked by another transaction.
`static int`	`ERROR_TRANSACTION_TOO_BIG`	The transaction contains too many changes.
`static int`	`ERROR_TRANSACTIONS_DEADLOCK`	Deadlock discovered and one of transactions involved chosen as victim and rolled back.
`static int`	`ERROR_UNKNOWN_DATA_TYPE`	The transaction store can not be initialized because data type is not found in type registry.
`static int`	`ERROR_UNSUPPORTED_FORMAT`	The file format is not supported.
`static int`	`ERROR_WRITING_FAILED`	An error occurred when trying to write to the file.
`static int`	`MAX_VAR_INT_LEN`	The maximum length of a variable size int.
`static int`	`MAX_VAR_LONG_LEN`	The maximum length of a variable size long.
`static java.lang.String`	`META_CHUNK`	The prefix for chunks ("chunk.").
`static java.lang.String`	`META_MAP`	The prefix for maps ("map.").
`static java.lang.String`	`META_NAME`	The prefix for names ("name.").
`static java.lang.String`	`META_ROOT`	The prefix for root positions of maps ("root.").
`static int`	`PAGE_COMPRESSED`	The bit mask for compressed pages (compression level fast).
`static int`	`PAGE_COMPRESSED_HIGH`	The bit mask for compressed pages (compression level high).
`static int`	`PAGE_HAS_PAGE_NO`	The bit mask for pages with page sequential number.
`static int`	`PAGE_LARGE`	The marker size of a very large page.
`static int`	`PAGE_TYPE_LEAF`	The type for leaf page.
`static int`	`PAGE_TYPE_NODE`	The type for node page.

Constructor Summary

Constructors
Constructor Description

DataUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`appendMap(java.lang.StringBuilder buff, java.lang.String key, int value)`	Append a key-value pair to the string builder.
`static void`	`appendMap(java.lang.StringBuilder buff, java.lang.String key, long value)`	Append a key-value pair to the string builder.
`static void`	`appendMap(java.lang.StringBuilder buff, java.lang.String key, java.lang.String value)`	Append a key-value pair to the string builder.
`static java.lang.StringBuilder`	`appendMap(java.lang.StringBuilder buff, java.util.HashMap<java.lang.String,?> map)`	Append a map to the string builder, sorted by key.
`private static java.lang.StringBuilder`	`appendMapKey(java.lang.StringBuilder buff, java.lang.String key)`
`static void`	`checkArgument(boolean test, java.lang.String message, java.lang.Object... arguments)`	Throw an IllegalArgumentException if the argument is invalid.
`static java.io.IOException`	`convertToIOException(java.lang.Throwable e)`	Convert an exception to an IO exception.
`static void`	`copyExcept(java.lang.Object src, java.lang.Object dst, int oldSize, int removeIndex)`	Copy the elements of an array, and remove one element.
`static void`	`copyWithGap(java.lang.Object src, java.lang.Object dst, int oldSize, int gapIndex)`	Copy the elements of an array, with a gap.
`static int`	`decodePageLength(int code)`	Get the maximum length for the given code.
`static int`	`encodeLength(int len)`	Convert the length to a length code 0..31.
`static java.lang.String`	`formatMessage(int errorCode, java.lang.String message, java.lang.Object... arguments)`	Format an error message.
`static short`	`getCheckValue(int x)`	Calculate a check value for the given integer.
`(package private) static int`	`getConfigParam(java.util.Map<java.lang.String,?> config, java.lang.String key, int defaultValue)`	Get the configuration parameter value, or default.
`static int`	`getFletcher32(byte[] bytes, int offset, int length)`	Calculate the Fletcher32 checksum.
`static java.lang.String`	`getFromMap(java.lang.String s, java.lang.String key)`	Parse a specified pair from key-value pair list.
`static java.lang.String`	`getMapName(java.lang.String s)`	Parse a name from key-value pair list.
`static int`	`getPageChunkId(long pos)`	Get the chunk id from the position.
`static int`	`getPageMapId(long tocElement)`	Get the map id from the chunk's table of content element.
`static int`	`getPageMaxLength(long pos)`	Get the maximum length for the given page position.
`static int`	`getPageOffset(long tocElement)`	Get the offset from the position.
`static long`	`getPagePos(int chunkId, int offset, int length, int type)`	Get the position of this page.
`static long`	`getPagePos(int chunkId, long tocElement)`	Convert tocElement into pagePos by replacing mapId with chunkId.
`static int`	`getPageType(long pos)`	Get the page type from the position.
`static long`	`getTocElement(int mapId, int offset, int length, int type)`	Create table of content element.
`static int`	`getVarIntLen(int x)`	Get the length of the variable size int.
`static int`	`getVarLongLen(long x)`	Get the length of the variable size long.
`private static <T extends java.lang.Exception> T`	`initCause(T e, java.lang.Object... arguments)`
`static boolean`	`isLeafPosition(long pos)`	Determines whether specified file position corresponds to a leaf page
`(package private) static boolean`	`isPageRemoved(long pos)`	Find out if page was removed.
`static boolean`	`isPageSaved(long pos)`	Find out if page was saved.
`static java.lang.IllegalArgumentException`	`newIllegalArgumentException(java.lang.String message, java.lang.Object... arguments)`	Create a new IllegalArgumentException.
`static MVStoreException`	`newMVStoreException(int errorCode, java.lang.String message, java.lang.Object... arguments)`	Create a new MVStoreException.
`static java.lang.UnsupportedOperationException`	`newUnsupportedOperationException(java.lang.String message)`	Create a new UnsupportedOperationException.
`(package private) static java.util.HashMap<java.lang.String,java.lang.String>`	`parseChecksummedMap(byte[] bytes)`	Parse a key-value pair list and checks its checksum.
`(package private) static byte[]`	`parseHexBytes(java.util.Map<java.lang.String,?> map, java.lang.String key)`	Parse the hex-encoded bytes of an entry in the map.
`static int`	`parseHexInt(java.lang.String x)`	Parse an unsigned, hex long.
`static long`	`parseHexLong(java.lang.String x)`	Parse an unsigned, hex long.
`static java.util.HashMap<java.lang.String,java.lang.String>`	`parseMap(java.lang.String s)`	Parse a key-value pair list.
`private static int`	`parseMapValue(java.lang.StringBuilder buff, java.lang.String s, int i, int size)`
`static void`	`readFully(java.nio.channels.FileChannel file, long pos, java.nio.ByteBuffer dst)`	Read from a file channel until the buffer is full.
`(package private) static int`	`readHexInt(java.util.Map<java.lang.String,?> map, java.lang.String key, int defaultValue)`	Read a hex int value from a map.
`static long`	`readHexLong(java.util.Map<java.lang.String,?> map, java.lang.String key, long defaultValue)`	Read a hex long value from a map.
`static java.lang.String`	`readString(java.nio.ByteBuffer buff)`	Read a string.
`static java.lang.String`	`readString(java.nio.ByteBuffer buff, int len)`	Read a string.
`static int`	`readVarInt(java.nio.ByteBuffer buff)`	Read a variable size int.
`private static int`	`readVarIntRest(java.nio.ByteBuffer buff, int b)`
`static long`	`readVarLong(java.nio.ByteBuffer buff)`	Read a variable size long.
`static void`	`writeFully(java.nio.channels.FileChannel file, long pos, java.nio.ByteBuffer src)`	Write to a file channel.
`static void`	`writeStringData(java.nio.ByteBuffer buff, java.lang.String s, int len)`	Write characters from a string (without the length).
`static void`	`writeVarInt(java.io.OutputStream out, int x)`	Write a variable size int.
`static void`	`writeVarInt(java.nio.ByteBuffer buff, int x)`	Write a variable size int.
`static void`	`writeVarLong(java.io.OutputStream out, long x)`	Write a variable size long.
`static void`	`writeVarLong(java.nio.ByteBuffer buff, long x)`	Write a variable size long.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ERROR_READING_FAILED
```
public static final int ERROR_READING_FAILED
```
    An error occurred while reading from the file.
    
    See Also:
    
    Constant Field Values
  - ERROR_WRITING_FAILED
```
public static final int ERROR_WRITING_FAILED
```
    An error occurred when trying to write to the file.
    
    See Also:
    
    Constant Field Values
  - ERROR_INTERNAL
```
public static final int ERROR_INTERNAL
```
    An internal error occurred. This could be a bug, or a memory corruption (for example caused by out of memory).
    
    See Also:
    
    Constant Field Values
  - ERROR_CLOSED
```
public static final int ERROR_CLOSED
```
    The object is already closed.
    
    See Also:
    
    Constant Field Values
  - ERROR_UNSUPPORTED_FORMAT
```
public static final int ERROR_UNSUPPORTED_FORMAT
```
    The file format is not supported.
    
    See Also:
    
    Constant Field Values
  - ERROR_FILE_CORRUPT
```
public static final int ERROR_FILE_CORRUPT
```
    The file is corrupt or (for encrypted files) the encryption key is wrong.
    
    See Also:
    
    Constant Field Values
  - ERROR_FILE_LOCKED
```
public static final int ERROR_FILE_LOCKED
```
    The file is locked.
    
    See Also:
    
    Constant Field Values
  - ERROR_SERIALIZATION
```
public static final int ERROR_SERIALIZATION
```
    An error occurred when serializing or de-serializing.
    
    See Also:
    
    Constant Field Values
  - ERROR_CHUNK_NOT_FOUND
```
public static final int ERROR_CHUNK_NOT_FOUND
```
    The application was trying to read data from a chunk that is no longer available.
    
    See Also:
    
    Constant Field Values
  - ERROR_BLOCK_NOT_FOUND
```
public static final int ERROR_BLOCK_NOT_FOUND
```
    The block in the stream store was not found.
    
    See Also:
    
    Constant Field Values
  - ERROR_TRANSACTION_CORRUPT
```
public static final int ERROR_TRANSACTION_CORRUPT
```
    The transaction store is corrupt.
    
    See Also:
    
    Constant Field Values
  - ERROR_TRANSACTION_LOCKED
```
public static final int ERROR_TRANSACTION_LOCKED
```
    An entry is still locked by another transaction.
    
    See Also:
    
    Constant Field Values
  - ERROR_TOO_MANY_OPEN_TRANSACTIONS
```
public static final int ERROR_TOO_MANY_OPEN_TRANSACTIONS
```
    There are too many open transactions.
    
    See Also:
    
    Constant Field Values
  - ERROR_TRANSACTION_ILLEGAL_STATE
```
public static final int ERROR_TRANSACTION_ILLEGAL_STATE
```
    The transaction store is in an illegal state (for example, not yet initialized).
    
    See Also:
    
    Constant Field Values
  - ERROR_TRANSACTION_TOO_BIG
```
public static final int ERROR_TRANSACTION_TOO_BIG
```
    The transaction contains too many changes.
    
    See Also:
    
    Constant Field Values
  - ERROR_TRANSACTIONS_DEADLOCK
```
public static final int ERROR_TRANSACTIONS_DEADLOCK
```
    Deadlock discovered and one of transactions involved chosen as victim and rolled back.
    
    See Also:
    
    Constant Field Values
  - ERROR_UNKNOWN_DATA_TYPE
```
public static final int ERROR_UNKNOWN_DATA_TYPE
```
    The transaction store can not be initialized because data type is not found in type registry.
    
    See Also:
    
    Constant Field Values
  - PAGE_TYPE_LEAF
```
public static final int PAGE_TYPE_LEAF
```
    The type for leaf page.
    
    See Also:
    
    Constant Field Values
  - PAGE_TYPE_NODE
```
public static final int PAGE_TYPE_NODE
```
    The type for node page.
    
    See Also:
    
    Constant Field Values
  - PAGE_COMPRESSED
```
public static final int PAGE_COMPRESSED
```
    The bit mask for compressed pages (compression level fast).
    
    See Also:
    
    Constant Field Values
  - PAGE_COMPRESSED_HIGH
```
public static final int PAGE_COMPRESSED_HIGH
```
    The bit mask for compressed pages (compression level high).
    
    See Also:
    
    Constant Field Values
  - PAGE_HAS_PAGE_NO
```
public static final int PAGE_HAS_PAGE_NO
```
    The bit mask for pages with page sequential number.
    
    See Also:
    
    Constant Field Values
  - MAX_VAR_INT_LEN
```
public static final int MAX_VAR_INT_LEN
```
    The maximum length of a variable size int.
    
    See Also:
    
    Constant Field Values
  - MAX_VAR_LONG_LEN
```
public static final int MAX_VAR_LONG_LEN
```
    The maximum length of a variable size long.
    
    See Also:
    
    Constant Field Values
  - COMPRESSED_VAR_INT_MAX
```
public static final int COMPRESSED_VAR_INT_MAX
```
    The maximum integer that needs less space when using variable size encoding (only 3 bytes instead of 4).
    
    See Also:
    
    Constant Field Values
  - COMPRESSED_VAR_LONG_MAX
```
public static final long COMPRESSED_VAR_LONG_MAX
```
    The maximum long that needs less space when using variable size encoding (only 7 bytes instead of 8).
    
    See Also:
    
    Constant Field Values
  - PAGE_LARGE
```
public static final int PAGE_LARGE
```
    The marker size of a very large page.
    
    See Also:
    
    Constant Field Values
  - META_CHUNK
```
public static final java.lang.String META_CHUNK
```
    The prefix for chunks ("chunk."). This, plus the chunk id (hex encoded) is the key, and the serialized chunk metadata is the value.
    
    See Also:
    
    Constant Field Values
  - META_ROOT
```
public static final java.lang.String META_ROOT
```
    The prefix for root positions of maps ("root."). This, plus the map id (hex encoded) is the key, and the position (hex encoded) is the value.
    
    See Also:
    
    Constant Field Values
  - META_NAME
```
public static final java.lang.String META_NAME
```
    The prefix for names ("name."). This, plus the name of the map, is the key, and the map id (hex encoded) is the value.
    
    See Also:
    
    Constant Field Values
  - META_MAP
```
public static final java.lang.String META_MAP
```
    The prefix for maps ("map."). This, plus the map id (hex encoded) is the key, and the serialized in the map metadata is the value.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DataUtils
```
public DataUtils()
```
- Method Detail
  - getVarIntLen
```
public static int getVarIntLen(int x)
```
    Get the length of the variable size int.
    
    Parameters:
    
    x - the value
    
    Returns:
    
    the length in bytes
  - getVarLongLen
```
public static int getVarLongLen(long x)
```
    Get the length of the variable size long.
    
    Parameters:
    
    x - the value
    
    Returns:
    
    the length in bytes
  - readVarInt
```
public static int readVarInt(java.nio.ByteBuffer buff)
```
    Read a variable size int.
    
    Parameters:
    
    buff - the source buffer
    
    Returns:
    
    the value
  - readVarIntRest
```
private static int readVarIntRest(java.nio.ByteBuffer buff,
                                  int b)
```
  - readVarLong
```
public static long readVarLong(java.nio.ByteBuffer buff)
```
    Read a variable size long.
    
    Parameters:
    
    buff - the source buffer
    
    Returns:
    
    the value
  - writeVarInt
```
public static void writeVarInt(java.io.OutputStream out,
                               int x)
                        throws java.io.IOException
```
    Write a variable size int.
    
    Parameters:
    
    out - the output stream
    
    x - the value
    
    Throws:
    
    java.io.IOException - if some data could not be written
  - writeVarInt
```
public static void writeVarInt(java.nio.ByteBuffer buff,
                               int x)
```
    Write a variable size int.
    
    Parameters:
    
    buff - the source buffer
    
    x - the value
  - writeStringData
```
public static void writeStringData(java.nio.ByteBuffer buff,
                                   java.lang.String s,
                                   int len)
```
    Write characters from a string (without the length).
    
    Parameters:
    
    buff - the target buffer (must be large enough)
    
    s - the string
    
    len - the number of characters
  - readString
```
public static java.lang.String readString(java.nio.ByteBuffer buff)
```
    Read a string.
    
    Parameters:
    
    buff - the source buffer
    
    Returns:
    
    the value
  - readString
```
public static java.lang.String readString(java.nio.ByteBuffer buff,
                                          int len)
```
    Read a string.
    
    Parameters:
    
    buff - the source buffer
    
    len - the number of characters
    
    Returns:
    
    the value
  - writeVarLong
```
public static void writeVarLong(java.nio.ByteBuffer buff,
                                long x)
```
    Write a variable size long.
    
    Parameters:
    
    buff - the target buffer
    
    x - the value
  - writeVarLong
```
public static void writeVarLong(java.io.OutputStream out,
                                long x)
                         throws java.io.IOException
```
    Write a variable size long.
    
    Parameters:
    
    out - the output stream
    
    x - the value
    
    Throws:
    
    java.io.IOException - if some data could not be written
  - copyWithGap
```
public static void copyWithGap(java.lang.Object src,
                               java.lang.Object dst,
                               int oldSize,
                               int gapIndex)
```
    Copy the elements of an array, with a gap.
    
    Parameters:
    
    src - the source array
    
    dst - the target array
    
    oldSize - the size of the old array
    
    gapIndex - the index of the gap
  - copyExcept
```
public static void copyExcept(java.lang.Object src,
                              java.lang.Object dst,
                              int oldSize,
                              int removeIndex)
```
    Copy the elements of an array, and remove one element.
    
    Parameters:
    
    src - the source array
    
    dst - the target array
    
    oldSize - the size of the old array
    
    removeIndex - the index of the entry to remove
  - readFully
```
public static void readFully(java.nio.channels.FileChannel file,
                             long pos,
                             java.nio.ByteBuffer dst)
```
    Read from a file channel until the buffer is full. The buffer is rewind after reading.
    
    Parameters:
    
    file - the file channel
    
    pos - the absolute position within the file
    
    dst - the byte buffer
    
    Throws:
    
    MVStoreException - if some data could not be read
  - writeFully
```
public static void writeFully(java.nio.channels.FileChannel file,
                              long pos,
                              java.nio.ByteBuffer src)
```
    Write to a file channel.
    
    Parameters:
    
    file - the file channel
    
    pos - the absolute position within the file
    
    src - the source buffer
  - encodeLength
```
public static int encodeLength(int len)
```
    Convert the length to a length code 0..31. 31 means more than 1 MB.
    
    Parameters:
    
    len - the length
    
    Returns:
    
    the length code
  - getPageChunkId
```
public static int getPageChunkId(long pos)
```
    Get the chunk id from the position.
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    the chunk id
  - getPageMapId
```
public static int getPageMapId(long tocElement)
```
    Get the map id from the chunk's table of content element.
    
    Parameters:
    
    tocElement - packed table of content element
    
    Returns:
    
    the map id
  - getPageMaxLength
```
public static int getPageMaxLength(long pos)
```
    Get the maximum length for the given page position.
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    the maximum length
  - decodePageLength
```
public static int decodePageLength(int code)
```
    Get the maximum length for the given code. For the code 31, PAGE_LARGE is returned.
    
    Parameters:
    
    code - encoded page length
    
    Returns:
    
    the maximum length
  - getPageOffset
```
public static int getPageOffset(long tocElement)
```
    Get the offset from the position.
    
    Parameters:
    
    tocElement - packed table of content element
    
    Returns:
    
    the offset
  - getPageType
```
public static int getPageType(long pos)
```
    Get the page type from the position.
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    the page type (PAGE_TYPE_NODE or PAGE_TYPE_LEAF)
  - isLeafPosition
```
public static boolean isLeafPosition(long pos)
```
    Determines whether specified file position corresponds to a leaf page
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    true if it is a leaf, false otherwise
  - isPageSaved
```
public static boolean isPageSaved(long pos)
```
    Find out if page was saved.
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    true if page has been saved
  - isPageRemoved
```
static boolean isPageRemoved(long pos)
```
    Find out if page was removed.
    
    Parameters:
    
    pos - the position
    
    Returns:
    
    true if page has been removed (no longer accessible from the current root of the tree)
  - getPagePos
```
public static long getPagePos(int chunkId,
                              int offset,
                              int length,
                              int type)
```
    Get the position of this page. The following information is encoded in the position: the chunk id, the page sequential number, the maximum length, and the type (node or leaf).
    
    Parameters:
    
    chunkId - the chunk id
    
    offset - the offset
    
    length - the length
    
    type - the page type (1 for node, 0 for leaf)
    
    Returns:
    
    the position
  - getPagePos
```
public static long getPagePos(int chunkId,
                              long tocElement)
```
    Convert tocElement into pagePos by replacing mapId with chunkId.
    
    Parameters:
    
    chunkId - the chunk id
    
    tocElement - the element
    
    Returns:
    
    the page position
  - getTocElement
```
public static long getTocElement(int mapId,
                                 int offset,
                                 int length,
                                 int type)
```
    Create table of content element. The following information is encoded in it: the map id, the page offset, the maximum length, and the type (node or leaf).
    
    Parameters:
    
    mapId - the chunk id
    
    offset - the offset
    
    length - the length
    
    type - the page type (1 for node, 0 for leaf)
    
    Returns:
    
    the position
  - getCheckValue
```
public static short getCheckValue(int x)
```
    Calculate a check value for the given integer. A check value is mean to verify the data is consistent with a high probability, but not meant to protect against media failure or deliberate changes.
    
    Parameters:
    
    x - the value
    
    Returns:
    
    the check value
  - appendMap
```
public static java.lang.StringBuilder appendMap(java.lang.StringBuilder buff,
                                                java.util.HashMap<java.lang.String,?> map)
```
    Append a map to the string builder, sorted by key.
    
    Parameters:
    
    buff - the target buffer
    
    map - the map
    
    Returns:
    
    the string builder
  - appendMapKey
```
private static java.lang.StringBuilder appendMapKey(java.lang.StringBuilder buff,
                                                    java.lang.String key)
```
  - appendMap
```
public static void appendMap(java.lang.StringBuilder buff,
                             java.lang.String key,
                             java.lang.String value)
```
    Append a key-value pair to the string builder. Keys may not contain a colon. Values that contain a comma or a double quote are enclosed in double quotes, with special characters escaped using a backslash.
    
    Parameters:
    
    buff - the target buffer
    
    key - the key
    
    value - the value
  - appendMap
```
public static void appendMap(java.lang.StringBuilder buff,
                             java.lang.String key,
                             long value)
```
    Append a key-value pair to the string builder. Keys may not contain a colon.
    
    Parameters:
    
    buff - the target buffer
    
    key - the key
    
    value - the value
  - appendMap
```
public static void appendMap(java.lang.StringBuilder buff,
                             java.lang.String key,
                             int value)
```
    Append a key-value pair to the string builder. Keys may not contain a colon.
    
    Parameters:
    
    buff - the target buffer
    
    key - the key
    
    value - the value
  - parseMapValue
```
private static int parseMapValue(java.lang.StringBuilder buff,
                                 java.lang.String s,
                                 int i,
                                 int size)
```
    Parameters:
    
    buff - output buffer, should be empty
    
    s - parsed string
    
    i - offset to parse from
    
    size - stop offset (exclusive)
    
    Returns:
    
    new offset
  - parseMap
```
public static java.util.HashMap<java.lang.String,java.lang.String> parseMap(java.lang.String s)
```
    Parse a key-value pair list.
    
    Parameters:
    
    s - the list
    
    Returns:
    
    the map
    
    Throws:
    
    MVStoreException - if parsing failed
  - parseChecksummedMap
```
static java.util.HashMap<java.lang.String,java.lang.String> parseChecksummedMap(byte[] bytes)
```
    Parse a key-value pair list and checks its checksum.
    
    Parameters:
    
    bytes - encoded map
    
    Returns:
    
    the map without mapping for "fletcher", or null if checksum is wrong or parameter do not represent a properly formatted map serialization
  - getMapName
```
public static java.lang.String getMapName(java.lang.String s)
```
    Parse a name from key-value pair list.
    
    Parameters:
    
    s - the list
    
    Returns:
    
    value of name item, or null
    
    Throws:
    
    MVStoreException - if parsing failed
  - getFromMap
```
public static java.lang.String getFromMap(java.lang.String s,
                                          java.lang.String key)
```
    Parse a specified pair from key-value pair list.
    
    Parameters:
    
    s - the list
    
    key - the name of the key
    
    Returns:
    
    value of the specified item, or null
    
    Throws:
    
    MVStoreException - if parsing failed
  - getFletcher32
```
public static int getFletcher32(byte[] bytes,
                                int offset,
                                int length)
```
    Calculate the Fletcher32 checksum.
    
    Parameters:
    
    bytes - the bytes
    
    offset - initial offset
    
    length - the message length (if odd, 0 is appended)
    
    Returns:
    
    the checksum
  - checkArgument
```
public static void checkArgument(boolean test,
                                 java.lang.String message,
                                 java.lang.Object... arguments)
```
    Throw an IllegalArgumentException if the argument is invalid.
    
    Parameters:
    
    test - true if the argument is valid
    
    message - the message
    
    arguments - the arguments
    
    Throws:
    
    java.lang.IllegalArgumentException - if the argument is invalid
  - newIllegalArgumentException
```
public static java.lang.IllegalArgumentException newIllegalArgumentException(java.lang.String message,
                                                                             java.lang.Object... arguments)
```
    Create a new IllegalArgumentException.
    
    Parameters:
    
    message - the message
    
    arguments - the arguments
    
    Returns:
    
    the exception
  - newUnsupportedOperationException
```
public static java.lang.UnsupportedOperationException newUnsupportedOperationException(java.lang.String message)
```
    Create a new UnsupportedOperationException.
    
    Parameters:
    
    message - the message
    
    Returns:
    
    the exception
  - newMVStoreException
```
public static MVStoreException newMVStoreException(int errorCode,
                                                   java.lang.String message,
                                                   java.lang.Object... arguments)
```
    Create a new MVStoreException.
    
    Parameters:
    
    errorCode - the error code
    
    message - the message
    
    arguments - the arguments
    
    Returns:
    
    the exception
  - initCause
```
private static <T extends java.lang.Exception> T initCause(T e,
                                                           java.lang.Object... arguments)
```
  - formatMessage
```
public static java.lang.String formatMessage(int errorCode,
                                             java.lang.String message,
                                             java.lang.Object... arguments)
```
    Format an error message.
    
    Parameters:
    
    errorCode - the error code
    
    message - the message
    
    arguments - the arguments
    
    Returns:
    
    the formatted message
  - readHexLong
```
public static long readHexLong(java.util.Map<java.lang.String,?> map,
                               java.lang.String key,
                               long defaultValue)
```
    Read a hex long value from a map.
    
    Parameters:
    
    map - the map
    
    key - the key
    
    defaultValue - if the value is null
    
    Returns:
    
    the parsed value
    
    Throws:
    
    MVStoreException - if parsing fails
  - parseHexLong
```
public static long parseHexLong(java.lang.String x)
```
    Parse an unsigned, hex long.
    
    Parameters:
    
    x - the string
    
    Returns:
    
    the parsed value
    
    Throws:
    
    MVStoreException - if parsing fails
  - parseHexInt
```
public static int parseHexInt(java.lang.String x)
```
    Parse an unsigned, hex long.
    
    Parameters:
    
    x - the string
    
    Returns:
    
    the parsed value
    
    Throws:
    
    MVStoreException - if parsing fails
  - readHexInt
```
static int readHexInt(java.util.Map<java.lang.String,?> map,
                      java.lang.String key,
                      int defaultValue)
```
    Read a hex int value from a map.
    
    Parameters:
    
    map - the map
    
    key - the key
    
    defaultValue - if the value is null
    
    Returns:
    
    the parsed value
    
    Throws:
    
    MVStoreException - if parsing fails
  - parseHexBytes
```
static byte[] parseHexBytes(java.util.Map<java.lang.String,?> map,
                            java.lang.String key)
```
    Parse the hex-encoded bytes of an entry in the map.
    
    Parameters:
    
    map - the map
    
    key - the key
    
    Returns:
    
    the byte array, or null if not in the map
  - getConfigParam
```
static int getConfigParam(java.util.Map<java.lang.String,?> config,
                          java.lang.String key,
                          int defaultValue)
```
    Get the configuration parameter value, or default.
    
    Parameters:
    
    config - the configuration
    
    key - the key
    
    defaultValue - the default
    
    Returns:
    
    the configured value or default
  - convertToIOException
```
public static java.io.IOException convertToIOException(java.lang.Throwable e)
```
    Convert an exception to an IO exception.
    
    Parameters:
    
    e - the root cause
    
    Returns:
    
    the IO exception

Class DataUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ERROR_READING_FAILED

ERROR_WRITING_FAILED

ERROR_INTERNAL

ERROR_CLOSED

ERROR_UNSUPPORTED_FORMAT

ERROR_FILE_CORRUPT

ERROR_FILE_LOCKED

ERROR_SERIALIZATION

ERROR_CHUNK_NOT_FOUND

ERROR_BLOCK_NOT_FOUND

ERROR_TRANSACTION_CORRUPT

ERROR_TRANSACTION_LOCKED

ERROR_TOO_MANY_OPEN_TRANSACTIONS

ERROR_TRANSACTION_ILLEGAL_STATE

ERROR_TRANSACTION_TOO_BIG

ERROR_TRANSACTIONS_DEADLOCK

ERROR_UNKNOWN_DATA_TYPE

PAGE_TYPE_LEAF

PAGE_TYPE_NODE

PAGE_COMPRESSED

PAGE_COMPRESSED_HIGH

PAGE_HAS_PAGE_NO

MAX_VAR_INT_LEN

MAX_VAR_LONG_LEN

COMPRESSED_VAR_INT_MAX

COMPRESSED_VAR_LONG_MAX

PAGE_LARGE

META_CHUNK

META_ROOT

META_NAME

META_MAP

Constructor Detail

DataUtils

Method Detail

getVarIntLen

getVarLongLen

readVarInt

readVarIntRest

readVarLong

writeVarInt

writeVarInt

writeStringData

readString

readString

writeVarLong

writeVarLong

copyWithGap

copyExcept

readFully

writeFully

encodeLength

getPageChunkId

getPageMapId

getPageMaxLength

decodePageLength

getPageOffset

getPageType

isLeafPosition

isPageSaved

isPageRemoved

getPagePos

getPagePos

getTocElement

getCheckValue

appendMap

appendMapKey

appendMap

appendMap

appendMap

parseMapValue

parseMap

parseChecksummedMap

getMapName

getFromMap