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## org.apache.cassandra.utils
Class FBUtilities

    java.lang.Object
      org.apache.cassandra.utils.FBUtilities

    public class FBUtilities

extends java.lang.Object

Field Summary
`static java.math.BigInteger` | `TWO`

Constructor Summary
`FBUtilities()`

Method Summary
`static long` | `absoluteFromFraction(double fractOrAbs, long total)`
`static void` | `atomicSetMax(java.util.concurrent.atomic.AtomicInteger atomic, int i)`
`static void` | `atomicSetMax(java.util.concurrent.atomic.AtomicLong atomic, long i)`
`static int` | `byteArrayToInt(byte[] bytes)`
`static int` | `byteArrayToInt(byte[] bytes, int offset)`
`static java.lang.String` | `bytesToHex(byte... bytes)`
`static int` | `compareByteArrays(byte[] bytes1, byte[] bytes2)`
`static void` | `compressToStream(byte[] input, java.io.ByteArrayOutputStream bos)`
`static byte[]` | `decompress(byte[] compressedData, int off, int len)`
`static void` | `deserialize(org.apache.thrift.TDeserializer deserializer, org.apache.thrift.TBase struct, java.io.DataInput in)`
`static int` | `encodedUTF8Length(java.lang.String st)`
`static boolean` | `equals(java.lang.Object a, java.lang.Object b)`
`static
`<T extends java.lang.Comparable<T>> org.apache.commons.collections.iterators.CollatingIterator`
` | `getCollatingIterator()`
`static AbstractType` | `getComparator(java.lang.String compareWith)`
`static java.net.InetAddress` | `getLocalAddress()`
`static java.math.BigInteger` | `hash(java.lang.String data)`
`static byte[]` | `hash(java.lang.String type, byte[]... data)`
`static byte[]` | `hexToBytes(java.lang.String str)`
`static java.lang.String` | `mapToString(java.util.Map<?,?> map)`
`static Pair<java.math.BigInteger,java.lang.Boolean>` | `midpoint(java.math.BigInteger left, java.math.BigInteger right, int sigbits)` Given two bit arrays represented as BigIntegers, containing the given number of significant bits, calculate a midpoint.
`static IPartitioner` | `newPartitioner(java.lang.String partitionerClassName)`
`static double` | `parseDoubleOrPercent(java.lang.String value)` Parses a string representing either a fraction, absolute value or percentage.
`static java.lang.String` | `readNullableString(java.io.DataInput dis)`
`static void` | `renameWithConfirm(java.lang.String tmpFilename, java.lang.String filename)`
`static void` | `serialize(org.apache.thrift.TSerializer serializer, org.apache.thrift.TBase struct, java.io.DataOutput out)`
`static void` | `sortSampledKeys(java.util.List<DecoratedKey> keys, Range range)`
`static java.lang.String[]` | `strip(java.lang.String string, java.lang.String token)`
`static byte[]` | `toByteArray(int i)`
`static byte[]` | `toByteArray(long n)`
`static void` | `tryMlockall()`
`static void` | `waitOnFutures(java.util.Collection<java.util.concurrent.Future<?>> futures)`
`static void` | `writeByteArray(byte[] bytes, java.io.DataOutput out)`
`static void` | `writeNullableString(java.lang.String key, java.io.DataOutput dos)`
`static byte[]` | `xor(byte[] left, byte[] right)`

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

Field Detail

### TWO

    public static final java.math.BigInteger TWO

Constructor Detail

### FBUtilities

    public FBUtilities()

Method Detail

### strip

    public static java.lang.String[] strip(java.lang.String string,
                                           java.lang.String token)

### parseDoubleOrPercent

    public static double parseDoubleOrPercent(java.lang.String value)

  Parses a string representing either a fraction, absolute value or percentage.

### getLocalAddress

    public static java.net.InetAddress getLocalAddress()

### absoluteFromFraction

    public static long absoluteFromFraction(double fractOrAbs,
                                            long total)

  Parameters:
    `fractOrAbs` - A double that may represent a fraction or absolute value.
    `total` - If fractionOrAbs is a fraction, the total to take the fraction from
  Returns:
    An absolute value which may be larger than the total.

### midpoint

    public static Pair<java.math.BigInteger,java.lang.Boolean> midpoint(java.math.BigInteger left,
                                                                        java.math.BigInteger right,
                                                                        int sigbits)

  Given two bit arrays represented as BigIntegers, containing the given number of significant bits, calculate a midpoint.

  Parameters:
    `left` - The left point.
    `right` - The right point.
    `sigbits` - The number of bits in the points that are significant.
  Returns:
    A midpoint that will compare bitwise halfway between the params, and a boolean representing whether a non-zero lsbit remainder was generated.

### toByteArray

    public static byte[] toByteArray(int i)

### byteArrayToInt

    public static int byteArrayToInt(byte[] bytes)

### byteArrayToInt

    public static int byteArrayToInt(byte[] bytes,
                                     int offset)

### compareByteArrays

    public static int compareByteArrays(byte[] bytes1,
                                        byte[] bytes2)

### xor

    public static byte[] xor(byte[] left,
                             byte[] right)

  Returns:
    The bitwise XOR of the inputs. The output will be the same length as the longer input, but if either input is null, the output will be null.

### hash

    public static java.math.BigInteger hash(java.lang.String data)

### hash

    public static byte[] hash(java.lang.String type,
                              byte[]... data)

### compressToStream

    public static void compressToStream(byte[] input,
                                        java.io.ByteArrayOutputStream bos)
                                 throws java.io.IOException

  Throws:
    `java.io.IOException`

### decompress

    public static byte[] decompress(byte[] compressedData,
                                    int off,
                                    int len)
                             throws java.io.IOException,
                                    java.util.zip.DataFormatException

  Throws:
    `java.io.IOException`
    `java.util.zip.DataFormatException`

### writeByteArray

    public static void writeByteArray(byte[] bytes,
                                      java.io.DataOutput out)
                               throws java.io.IOException

  Throws:
    `java.io.IOException`

### hexToBytes

    public static byte[] hexToBytes(java.lang.String str)

### bytesToHex

    public static java.lang.String bytesToHex(byte... bytes)

### mapToString

    public static java.lang.String mapToString(java.util.Map<?,?> map)

### writeNullableString

    public static void writeNullableString(java.lang.String key,
                                           java.io.DataOutput dos)
                                    throws java.io.IOException

  Throws:
    `java.io.IOException`

### readNullableString

    public static java.lang.String readNullableString(java.io.DataInput dis)
                                               throws java.io.IOException

  Throws:
    `java.io.IOException`

### renameWithConfirm

    public static void renameWithConfirm(java.lang.String tmpFilename,
                                         java.lang.String filename)
                                  throws java.io.IOException

  Throws:
    `java.io.IOException`

### getCollatingIterator

    public static <T extends java.lang.Comparable<T>> org.apache.commons.collections.iterators.CollatingIterator getCollatingIterator()

### atomicSetMax

    public static void atomicSetMax(java.util.concurrent.atomic.AtomicInteger atomic,
                                    int i)

### atomicSetMax

    public static void atomicSetMax(java.util.concurrent.atomic.AtomicLong atomic,
                                    long i)

### serialize

    public static void serialize(org.apache.thrift.TSerializer serializer,
                                 org.apache.thrift.TBase struct,
                                 java.io.DataOutput out)
                          throws java.io.IOException

  Throws:
    `java.io.IOException`

### deserialize

    public static void deserialize(org.apache.thrift.TDeserializer deserializer,
                                   org.apache.thrift.TBase struct,
                                   java.io.DataInput in)
                            throws java.io.IOException

  Throws:
    `java.io.IOException`

### sortSampledKeys

    public static void sortSampledKeys(java.util.List<DecoratedKey> keys,
                                       Range range)

### equals

    public static boolean equals(java.lang.Object a,
                                 java.lang.Object b)

### encodedUTF8Length

    public static int encodedUTF8Length(java.lang.String st)

### toByteArray

    public static byte[] toByteArray(long n)

### waitOnFutures

    public static void waitOnFutures(java.util.Collection<java.util.concurrent.Future<?>> futures)

### newPartitioner

    public static IPartitioner newPartitioner(java.lang.String partitionerClassName)

### getComparator

    public static AbstractType getComparator(java.lang.String compareWith)

### tryMlockall

    public static void tryMlockall()

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Copyright © 2010 The Apache Software Foundation