org.apache.sysds.runtime.io

## Class IOUtilFunctions

- java.lang.Object
- - org.apache.sysds.runtime.io.IOUtilFunctions

-     public class IOUtilFunctions
      extends Object

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `IOUtilFunctions.CountRowsTask`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `EMPTY_TEXT_LINE`
    `static org.apache.hadoop.fs.PathFilter` | `hiddenFileFilter`
    `static String` | `LIBSVM_DELIM`
    `static String` | `LIBSVM_INDEX_DELIM`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `IOUtilFunctions()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static int` | `baToInt(byte[] ba, int off)`
    `static long` | `baToLong(byte[] ba, int off)`
    `static int` | `baToShort(byte[] ba, int off)`
    `static void` | `checkAndRaiseErrorCSVEmptyField(String row, boolean fill, boolean emptyFound)`
    `static void` | `checkAndRaiseErrorCSVNumColumns(String fname, String line, String[] parts, long ncol)`
    `static void` | `closeSilently(Closeable io)`
    `static void` | `closeSilently(org.apache.hadoop.mapred.RecordReader<?,?> rr)`
    `static int` | `countNnz(String[] cols)` Returns the number of non-zero entries but avoids the expensive string to double parsing.
    `static int` | `countNnz(String[] cols, int pos, int len)` Returns the number of non-zero entries but avoids the expensive string to double parsing.
    `static int` | `countNumColumnsCSV(org.apache.hadoop.mapred.InputSplit[] splits, org.apache.hadoop.mapred.InputFormat informat, org.apache.hadoop.mapred.JobConf job, String delim)` Counts the number of columns in a given collection of csv file splits.
    `static int` | `countTokensCSV(String str, String delim)` Counts the number of tokens defined by the given delimiter, respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
    `static void` | `deleteCrcFilesFromLocalFileSystem(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path path)` Delete the CRC files from the local file system associated with a particular file and its metadata file.
    `static <T> T` | `get(Future<T> in)`
    `static byte[]` | `getBytes(ByteBuffer buff)`
    `static org.apache.hadoop.fs.FileSystem` | `getFileSystem(org.apache.hadoop.conf.Configuration conf)`
    `static org.apache.hadoop.fs.FileSystem` | `getFileSystem(org.apache.hadoop.fs.Path fname)`
    `static org.apache.hadoop.fs.FileSystem` | `getFileSystem(org.apache.hadoop.fs.Path fname, org.apache.hadoop.conf.Configuration conf)`
    `static org.apache.hadoop.fs.FileSystem` | `getFileSystem(String fname)`
    `static String` | `getPartFileName(int pos)`
    `static org.apache.hadoop.fs.Path[]` | `getSequenceFilePaths(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path file)`
    `static int` | `getUTFSize(String value)` Returns the serialized size in bytes of the given string value, following the modified UTF-8 specification as used by Java's DataInput/DataOutput.
    `static void` | `intToBa(int val, byte[] ba, int off)`
    `static boolean` | `isObjectStoreFileScheme(org.apache.hadoop.fs.Path path)`
    `static boolean` | `isSameFileScheme(org.apache.hadoop.fs.Path path1, org.apache.hadoop.fs.Path path2)`
    `static void` | `longToBa(long val, byte[] ba, int off)`
    `static FileFormatPropertiesMM` | `readAndParseMatrixMarketHeader(String filename)`
    `static String[]` | `readMatrixMarketHeader(String filename)`
    `static void` | `shortToBa(int val, byte[] ba, int off)`
    `static org.apache.hadoop.mapred.InputSplit[]` | `sortInputSplits(org.apache.hadoop.mapred.InputSplit[] splits)`
    `static String[]` | `split(String str, String delim)` Splits a string by a specified delimiter into all tokens, including empty.
    `static String[]` | `splitByFirst(String str, String delim)`
    `static String[]` | `splitCSV(String str, String delim)` Splits a string by a specified delimiter into all tokens, including empty while respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
    `static String[]` | `splitCSV(String str, String delim, String[] tokens, Set<String> naStrings)` Splits a string by a specified delimiter into all tokens, including empty while respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
    `static InputStream` | `toInputStream(String input)`
    `static String` | `toString(InputStream input)`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### hiddenFileFilter

          public static final org.apache.hadoop.fs.PathFilter hiddenFileFilter

    - #### EMPTY_TEXT_LINE

          public static final String EMPTY_TEXT_LINE

      See Also:
        Constant Field Values

    - #### LIBSVM_DELIM

          public static final String LIBSVM_DELIM

      See Also:
        Constant Field Values

    - #### LIBSVM_INDEX_DELIM

          public static final String LIBSVM_INDEX_DELIM

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### IOUtilFunctions

          public IOUtilFunctions()

  - ### Method Detail

    - #### getFileSystem

          public static org.apache.hadoop.fs.FileSystem getFileSystem(String fname)
                                                               throws IOException

      Throws:
        `IOException`

    - #### getFileSystem

          public static org.apache.hadoop.fs.FileSystem getFileSystem(org.apache.hadoop.fs.Path fname)
                                                               throws IOException

      Throws:
        `IOException`

    - #### getFileSystem

          public static org.apache.hadoop.fs.FileSystem getFileSystem(org.apache.hadoop.conf.Configuration conf)
                                                               throws IOException

      Throws:
        `IOException`

    - #### getFileSystem

          public static org.apache.hadoop.fs.FileSystem getFileSystem(org.apache.hadoop.fs.Path fname,
                                                                      org.apache.hadoop.conf.Configuration conf)
                                                               throws IOException

      Throws:
        `IOException`

    - #### isSameFileScheme

          public static boolean isSameFileScheme(org.apache.hadoop.fs.Path path1,
                                                 org.apache.hadoop.fs.Path path2)

    - #### isObjectStoreFileScheme

          public static boolean isObjectStoreFileScheme(org.apache.hadoop.fs.Path path)

    - #### getPartFileName

          public static String getPartFileName(int pos)

    - #### closeSilently

          public static void closeSilently(Closeable io)

    - #### closeSilently

          public static void closeSilently(org.apache.hadoop.mapred.RecordReader<?,?> rr)

    - #### checkAndRaiseErrorCSVEmptyField

          public static void checkAndRaiseErrorCSVEmptyField(String row,
                                                             boolean fill,
                                                             boolean emptyFound)
                                                      throws IOException

      Throws:
        `IOException`

    - #### checkAndRaiseErrorCSVNumColumns

          public static void checkAndRaiseErrorCSVNumColumns(String fname,
                                                             String line,
                                                             String[] parts,
                                                             long ncol)
                                                      throws IOException

      Throws:
        `IOException`

    - #### split

          public static String[] split(String str,
                                       String delim)

      Splits a string by a specified delimiter into all tokens, including empty. NOTE: This method is meant as a faster drop-in replacement of the regular string split.
      Parameters:
        `str` - string to split
        `delim` - delimiter
      Returns:
        string array

    - #### splitCSV

          public static String[] splitCSV(String str,
                                          String delim)

      Splits a string by a specified delimiter into all tokens, including empty while respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
      Parameters:
        `str` - string to split
        `delim` - delimiter
      Returns:
        string array of tokens

    - #### splitCSV

          public static String[] splitCSV(String str,
                                          String delim,
                                          String[] tokens,
                                          Set<String> naStrings)

      Splits a string by a specified delimiter into all tokens, including empty while respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
      Parameters:
        `str` - string to split
        `delim` - delimiter
        `tokens` - array for tokens, length needs to match the number of tokens
        `naStrings` - the strings to map to null value.
      Returns:
        string array of tokens

    - #### countTokensCSV

          public static int countTokensCSV(String str,
                                           String delim)

      Counts the number of tokens defined by the given delimiter, respecting the rules for quotes and escapes defined in RFC4180, with robustness for various special cases.
      Parameters:
        `str` - string to split
        `delim` - delimiter
      Returns:
        number of tokens split by the given delimiter

    - #### splitByFirst

          public static String[] splitByFirst(String str,
                                              String delim)

    - #### readAndParseMatrixMarketHeader

          public static FileFormatPropertiesMM readAndParseMatrixMarketHeader(String filename)
                                                                       throws DMLRuntimeException

      Throws:
        `DMLRuntimeException`

    - #### readMatrixMarketHeader

          public static String[] readMatrixMarketHeader(String filename)

    - #### countNnz

          public static int countNnz(String[] cols)

      Returns the number of non-zero entries but avoids the expensive string to double parsing. This function is guaranteed to never underestimate.
      Parameters:
        `cols` - string array
      Returns:
        number of non-zeros

    - #### countNnz

          public static int countNnz(String[] cols,
                                     int pos,
                                     int len)

      Returns the number of non-zero entries but avoids the expensive string to double parsing. This function is guaranteed to never underestimate.
      Parameters:
        `cols` - string array
        `pos` - starting array index
        `len` - ending array index
      Returns:
        number of non-zeros

    - #### getUTFSize

          public static int getUTFSize(String value)

      Returns the serialized size in bytes of the given string value, following the modified UTF-8 specification as used by Java's DataInput/DataOutput. see java docs: docs/api/java/io/DataInput.html#modified-utf-8
      Parameters:
        `value` - string value
      Returns:
        string size for modified UTF-8 specification

    - #### toInputStream

          public static InputStream toInputStream(String input)

    - #### toString

          public static String toString(InputStream input)
                                 throws IOException

      Throws:
        `IOException`

    - #### sortInputSplits

          public static org.apache.hadoop.mapred.InputSplit[] sortInputSplits(org.apache.hadoop.mapred.InputSplit[] splits)

    - #### countNumColumnsCSV

          public static int countNumColumnsCSV(org.apache.hadoop.mapred.InputSplit[] splits,
                                               org.apache.hadoop.mapred.InputFormat informat,
                                               org.apache.hadoop.mapred.JobConf job,
                                               String delim)
                                        throws IOException

      Counts the number of columns in a given collection of csv file splits. This primitive aborts if a row with more than 0 columns is found and hence is robust against empty file splits etc.
      Parameters:
        `splits` - input splits
        `informat` - input format
        `job` - job configruation
        `delim` - delimiter
      Returns:
        the number of columns in the collection of csv file splits
      Throws:
        `IOException` - if IOException occurs

    - #### getSequenceFilePaths

          public static org.apache.hadoop.fs.Path[] getSequenceFilePaths(org.apache.hadoop.fs.FileSystem fs,
                                                                         org.apache.hadoop.fs.Path file)
                                                                  throws IOException

      Throws:
        `IOException`

    - #### deleteCrcFilesFromLocalFileSystem

          public static void deleteCrcFilesFromLocalFileSystem(org.apache.hadoop.fs.FileSystem fs,
                                                               org.apache.hadoop.fs.Path path)
                                                        throws IOException

      Delete the CRC files from the local file system associated with a particular file and its metadata file.
      Parameters:
        `fs` - the file system
        `path` - the path to a file
      Throws:
        `IOException` - thrown if error occurred attempting to delete crc files

    - #### baToShort

          public static int baToShort(byte[] ba,
                                      int off)

    - #### baToInt

          public static int baToInt(byte[] ba,
                                    int off)

    - #### baToLong

          public static long baToLong(byte[] ba,
                                      int off)

    - #### shortToBa

          public static void shortToBa(int val,
                                       byte[] ba,
                                       int off)

    - #### intToBa

          public static void intToBa(int val,
                                     byte[] ba,
                                     int off)

    - #### longToBa

          public static void longToBa(long val,
                                      byte[] ba,
                                      int off)

    - #### getBytes

          public static byte[] getBytes(ByteBuffer buff)

    - #### get

          public static <T> T get(Future<T> in)

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