com.amazon.redshift.core

Class Encoding

java.lang.Object

com.amazon.redshift.core.Encoding

public class Encoding
extends Object

Representation of a particular character encoding.

Field Summary

Fields

Modifier and Type	Field and Description
protected RedshiftLogger	logger

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Encoding(Charset encoding, boolean fastASCIINumbers, RedshiftLogger logger) Subclasses may use this constructor if they know in advance of their ASCII number compatibility.
protected	Encoding(Charset encoding, RedshiftLogger logger) Use the charset passed as parameter and tests at creation time whether the specified encoding is compatible with ASCII numbers.

Method Summary

Modifier and Type	Method and Description
String	decode(byte[] encodedString) Decode an array of bytes into a string.
String	decode(byte[] encodedString, int offset, int length) Decode an array of bytes into a string.
static Encoding	defaultEncoding() Get an Encoding using the default encoding for the JVM.
byte[]	encode(String s) Encode a string to an array of bytes.
static Encoding	getDatabaseEncoding(String databaseEncoding, RedshiftLogger logger) Construct an Encoding for a given database encoding.
Reader	getDecodingReader(InputStream in) Get a Reader that decodes the given InputStream using this encoding.
Writer	getEncodingWriter(OutputStream out) Get a Writer that encodes to the given OutputStream using this encoding.
static Encoding	getJVMEncoding(String jvmEncoding, RedshiftLogger logger) Construct an Encoding for a given JVM encoding.
boolean	hasAsciiNumbers() Returns true if this encoding has characters '-' and '0'..'9' in exactly same posision as ascii.
String	name() Get the name of the (JVM) encoding used.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

logger

protected RedshiftLogger logger

Constructor Detail

Encoding

protected Encoding(Charset encoding,
                   boolean fastASCIINumbers,
                   RedshiftLogger logger)

Subclasses may use this constructor if they know in advance of their ASCII number compatibility.

Parameters:

encoding - charset to use

logger - the logger to log the entry for debugging.

fastASCIINumbers - whether this encoding is compatible with ASCII numbers.

Encoding

protected Encoding(Charset encoding,
                   RedshiftLogger logger)

Use the charset passed as parameter and tests at creation time whether the specified encoding is compatible with ASCII numbers.

Parameters:

encoding - charset to use

logger - the logger to log the entry for debugging.

Method Detail

hasAsciiNumbers

public boolean hasAsciiNumbers()

Returns true if this encoding has characters '-' and '0'..'9' in exactly same posision as ascii.

Returns:

true if the bytes can be scanned directly for ascii numbers.

getJVMEncoding

public static Encoding getJVMEncoding(String jvmEncoding,
                                      RedshiftLogger logger)

Construct an Encoding for a given JVM encoding.

Parameters:

jvmEncoding - the name of the JVM encoding

logger - the logger to log the entry for debugging.

Returns:

an Encoding instance for the specified encoding, or an Encoding instance for the default JVM encoding if the specified encoding is unavailable.

getDatabaseEncoding

public static Encoding getDatabaseEncoding(String databaseEncoding,
                                           RedshiftLogger logger)

Construct an Encoding for a given database encoding.

Parameters:

databaseEncoding - the name of the database encoding

logger - the logger to log the entry for debugging.

Returns:

an Encoding instance for the specified encoding, or an Encoding instance for the default JVM encoding if the specified encoding is unavailable.

name

public String name()

Get the name of the (JVM) encoding used.

Returns:

the JVM encoding name used by this instance.

encode

public byte[] encode(String s)
              throws IOException

Encode a string to an array of bytes.

Parameters:

s - the string to encode

Returns:

a bytearray containing the encoded string

Throws:

IOException - if something goes wrong

decode

public String decode(byte[] encodedString,
                     int offset,
                     int length)
              throws IOException

Decode an array of bytes into a string.

Parameters:

encodedString - a byte array containing the string to decode

offset - the offset in encodedString of the first byte of the encoded representation

length - the length, in bytes, of the encoded representation

Returns:

the decoded string

Throws:

IOException - if something goes wrong

decode

public String decode(byte[] encodedString)
              throws IOException

Decode an array of bytes into a string.

Parameters:

encodedString - a byte array containing the string to decode

Returns:

the decoded string

Throws:

IOException - if something goes wrong

getDecodingReader

public Reader getDecodingReader(InputStream in)
                         throws IOException

Get a Reader that decodes the given InputStream using this encoding.

Parameters:

in - the underlying stream to decode from

Returns:

a non-null Reader implementation.

Throws:

IOException - if something goes wrong

getEncodingWriter

public Writer getEncodingWriter(OutputStream out)
                         throws IOException

Get a Writer that encodes to the given OutputStream using this encoding.

Parameters:

out - the underlying stream to encode to

Returns:

a non-null Writer implementation.

Throws:

IOException - if something goes wrong

defaultEncoding

public static Encoding defaultEncoding()

Get an Encoding using the default encoding for the JVM.

Returns:

an Encoding instance

toString

public String toString()

Overrides:

toString in class Object