de.ipcon.db.io

Class Output

java.lang.Object

de.ipcon.db.io.Output

public final class Output
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
Output()

Method Summary

Modifier and Type	Method and Description
static void	writeBool(java.lang.Boolean val, java.io.DataOutput out) Writes a Boolean object to the given DataOutput.
static void	writeByte(java.lang.Byte val, java.io.DataOutput out) Writes a (signed) Byte object to the given DataOutput.
static void	writeByteArray(byte[] b, java.io.DataOutput out)
static void	writeByteArray(byte[] b, int off, int len, java.io.DataOutput out)
static void	writeDate(java.util.Date val, java.io.DataOutput out) Writes a Date object to the given DataOutput.
static void	writeDecimal(java.math.BigDecimal val, java.io.DataOutput out) Writes a BigDecimal object to the given DataOutput.
static void	writeDouble(java.lang.Double val, java.io.DataOutput out) Writes a Double object to the given DataOutput.
static void	writeFloat(java.lang.Float val, java.io.DataOutput out) Writes a Float object to the given DataOutput.
static void	writeInt(int n, java.io.DataOutput out) Writes a primitive int as Byte object to the given DataOutput.
static void	writeInt(java.lang.Integer val, java.io.DataOutput out) FIXME!
static void	writeLong(java.lang.Long val, java.io.DataOutput out) FIXME!
static void	writeShort(java.lang.Short val, java.io.DataOutput out) Writes a Short object to the given DataOutput.
static void	writeSidebandMarker(java.io.DataOutput out) Writes a SIDEBAND_MARKER to the passed DataOutput.
static void	writeUTF(java.lang.String str, java.io.DataOutput out) This is a code inspired by the writeUTF method in DataOutputStream, which has the drawback of being unable to transfer more than 64k long String.

Methods inherited from class java.lang.Object

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

Constructor Detail

Output

public Output()

Method Detail

writeUTF

public static void writeUTF(java.lang.String str,
                            java.io.DataOutput out)
                     throws java.io.IOException

This is a code inspired by the writeUTF method in DataOutputStream, which has the drawback of being unable to transfer more than 64k long String.

Throws:

java.io.IOException

writeDecimal

public static void writeDecimal(java.math.BigDecimal val,
                                java.io.DataOutput out)
                         throws java.io.IOException

Writes a BigDecimal object to the given DataOutput.

Throws:

java.io.IOException

writeLong

public static void writeLong(java.lang.Long val,
                             java.io.DataOutput out)
                      throws java.io.IOException

FIXME! These docs are outdated! Please update! This will write a long in 1-9 bytes including null-case (which would lead to 8 bytes + 1 bit uncompressed). The scheme is as follows: The central idea is to put 7 bit chunks as long as the stop bit (which is in bit 8) isn't 1. We will treat the first byte stop bit a bit special to forward the case of -64 to the 2 byte version. The byte #7 doesn't have a stop bit, the byte #8 comes in full, so we have 8*7 bits + 8 bits = 64 bits. byte nr. Sxxxxxxx 0 11000000 -> null 0 1xxxxxxx -> any other 7 bit number (-63..63) 1..7 8 xxxxxxxx -> left over 8 bits if #7 had no stop bit.

Throws:

java.io.IOException

writeDouble

public static void writeDouble(java.lang.Double val,
                               java.io.DataOutput out)
                        throws java.io.IOException

Writes a Double object to the given DataOutput. This case rarely occurs, as we use BigDecimal everywhere, so it's ok to use writeLong without optimization for the resulting bit-patterns coming out of Double.doubleToLongBits

Throws:

java.io.IOException

writeInt

public static void writeInt(java.lang.Integer val,
                            java.io.DataOutput out)
                     throws java.io.IOException

FIXME! These docs are outdated! Please update! This will write an int in 1-5 bytes including null-case (which would lead to 4 bytes + 1 bit uncompressed). The scheme is as follows: The central idea is to put 7 bit chunks as long as the stop bit (which is in bit 8) isn't 1. We will treat the first byte bit stop bit a bit special to forward the case of -64 to the 2 byte version. All in all we get 5*7 = 35 bits, the 32 net bits are adjusted to the right and filled up with bit 31 aka sign bit. byte nr. Sxxxxxxx 0 11000000 -> null 0 1xxxxxxx -> any other 7 bit number (-63..63) 1..7 8 xxxxxxxx -> left over 8 bits if #7 had no stop bit.

Throws:

java.io.IOException

writeShort

public static void writeShort(java.lang.Short val,
                              java.io.DataOutput out)
                       throws java.io.IOException

Writes a Short object to the given DataOutput.

Throws:

java.io.IOException

writeByte

public static void writeByte(java.lang.Byte val,
                             java.io.DataOutput out)
                      throws java.io.IOException

Writes a (signed) Byte object to the given DataOutput.

Throws:

java.io.IOException

writeFloat

public static void writeFloat(java.lang.Float val,
                              java.io.DataOutput out)
                       throws java.io.IOException

Writes a Float object to the given DataOutput. This case rarely occurs, as we use BigDecimal everywhere, so it's ok to use writeInt without optimization for the resulting bit-patterns coming out of Float.floatToIntBits

Throws:

java.io.IOException

writeInt

public static void writeInt(int n,
                            java.io.DataOutput out)
                     throws java.io.IOException

Writes a primitive int as Byte object to the given DataOutput. This function is exposed to enable calling it painlessly with smaller datatypes...

Throws:

java.io.IOException

writeBool

public static void writeBool(java.lang.Boolean val,
                             java.io.DataOutput out)
                      throws java.io.IOException

Writes a Boolean object to the given DataOutput.

Throws:

java.io.IOException

writeDate

public static void writeDate(java.util.Date val,
                             java.io.DataOutput out)
                      throws java.io.IOException

Writes a Date object to the given DataOutput.

Throws:

java.io.IOException

writeByteArray

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

Throws:

java.io.IOException

writeByteArray

public static void writeByteArray(byte[] b,
                                  int off,
                                  int len,
                                  java.io.DataOutput out)
                           throws java.io.IOException

Throws:

java.io.IOException

writeSidebandMarker

public static void writeSidebandMarker(java.io.DataOutput out)
                                throws java.io.IOException

Writes a SIDEBAND_MARKER to the passed DataOutput.

Throws:

java.io.IOException