BaseNCodec (paypal-core 1.7.2 API)

java.lang.Object
- com.paypal.core.codec.binary.BaseNCodec

All Implemented Interfaces:

BinaryDecoder, BinaryEncoder, Decoder, Encoder

Direct Known Subclasses:

Base64
```
public abstract class BaseNCodec
extends Object
implements BinaryEncoder, BinaryDecoder
```
Abstract superclass for Base-N encoders and decoders.
This class is not thread-safe. Each thread should use its own instance.

Field Summary

Fields
Modifier and Type	Field and Description
`protected byte[]`	`buffer` Buffer for streaming.
`protected int`	`currentLinePos` Variable tracks how many characters have been written to the current line.
`protected boolean`	`eof` Boolean flag to indicate the EOF has been reached.
`protected int`	`lineLength` Chunksize for encoding.
`protected static int`	`MASK_8BITS` Mask used to extract 8 bits, used in decoding bytes
`static int`	`MIME_CHUNK_SIZE` MIME chunk size per RFC 2045 section 6.8.
`protected int`	`modulus` Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding.
`protected byte`	`PAD`
`protected static byte`	`PAD_DEFAULT` Byte used to pad output.
`static int`	`PEM_CHUNK_SIZE` PEM chunk size per RFC 1421 section 4.3.2.4.
`protected int`	`pos` Position where next character should be written in the buffer.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`BaseNCodec(int unencodedBlockSize, int encodedBlockSize, int lineLength, int chunkSeparatorLength)` Note `lineLength` is rounded down to the nearest multiple of `encodedBlockSize` If `chunkSeparatorLength` is zero, then chunking is disabled.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`protected boolean`	`containsAlphabetOrPad(byte[] arrayOctet)` Tests a given byte array to see if it contains any characters within the alphabet or PAD.
`byte[]`	`decode(byte[] pArray)` Decodes a byte[] containing characters in the Base-N alphabet.
`Object`	`decode(Object pObject)` Decodes an Object using the Base-N algorithm.
`byte[]`	`decode(String pArray)` Decodes a String containing characters in the Base-N alphabet.
`byte[]`	`encode(byte[] pArray)` Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.
`Object`	`encode(Object pObject)` Encodes an Object using the Base-N algorithm.
`String`	`encodeAsString(byte[] pArray)` Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet.
`String`	`encodeToString(byte[] pArray)` Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.
`protected void`	`ensureBufferSize(int size)` Ensure that the buffer has room for `size` bytes
`protected int`	`getDefaultBufferSize()` Get the default buffer size.
`long`	`getEncodedLength(byte[] pArray)` Calculates the amount of space needed to encode the supplied array.
`protected abstract boolean`	`isInAlphabet(byte value)` Returns whether or not the `octet` is in the current alphabet.
`boolean`	`isInAlphabet(byte[] arrayOctet, boolean allowWSPad)` Tests a given byte array to see if it contains only valid characters within the alphabet.
`boolean`	`isInAlphabet(String basen)` Tests a given String to see if it contains only valid characters within the alphabet.
`protected static boolean`	`isWhiteSpace(byte byteToCheck)` Checks if a byte value is whitespace or not.

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

- Field Detail
  - MIME_CHUNK_SIZE
```
public static final int MIME_CHUNK_SIZE
```
    MIME chunk size per RFC 2045 section 6.8.
    The 76 character limit does not count the trailing CRLF, but counts all other characters, including any equal signs.
    
    See Also:
    
    RFC 2045 section 6.8, Constant Field Values
  - PEM_CHUNK_SIZE
```
public static final int PEM_CHUNK_SIZE
```
    PEM chunk size per RFC 1421 section 4.3.2.4.
    The 64 character limit does not count the trailing CRLF, but counts all other characters, including any equal signs.
    
    See Also:
    
    RFC 1421 section 4.3.2.4, Constant Field Values
  - MASK_8BITS
```
protected static final int MASK_8BITS
```
    Mask used to extract 8 bits, used in decoding bytes
    
    See Also:
    
    Constant Field Values
  - PAD_DEFAULT
```
protected static final byte PAD_DEFAULT
```
    Byte used to pad output.
    
    See Also:
    
    Constant Field Values
  - PAD
```
protected final byte PAD
```
    See Also:
    
    Constant Field Values
  - lineLength
```
protected final int lineLength
```
    Chunksize for encoding. Not used when decoding. A value of zero or less implies no chunking of the encoded data. Rounded down to nearest multiple of encodedBlockSize.
  - buffer
```
protected byte[] buffer
```
    Buffer for streaming.
  - pos
```
protected int pos
```
    Position where next character should be written in the buffer.
  - eof
```
protected boolean eof
```
    Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless, and must be thrown away.
  - currentLinePos
```
protected int currentLinePos
```
    Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to make sure each encoded line never goes beyond lineLength (if lineLength > 0).
  - modulus
```
protected int modulus
```
    Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding. This variable helps track that.
- Constructor Detail
  - BaseNCodec
```
protected BaseNCodec(int unencodedBlockSize,
                     int encodedBlockSize,
                     int lineLength,
                     int chunkSeparatorLength)
```
    Note lineLength is rounded down to the nearest multiple of encodedBlockSize If chunkSeparatorLength is zero, then chunking is disabled.
    
    Parameters:
    
    unencodedBlockSize - the size of an unencoded block (e.g. Base64 = 3)
    
    encodedBlockSize - the size of an encoded block (e.g. Base64 = 4)
    
    lineLength - if > 0, use chunking with a length lineLength
    
    chunkSeparatorLength - the chunk separator length, if relevant
- Method Detail
  - getDefaultBufferSize
```
protected int getDefaultBufferSize()
```
    Get the default buffer size. Can be overridden.
    
    Returns:
    
    DEFAULT_BUFFER_SIZE
  - ensureBufferSize
```
protected void ensureBufferSize(int size)
```
    Ensure that the buffer has room for size bytes
    
    Parameters:
    
    size - minimum spare space required
  - isWhiteSpace
```
protected static boolean isWhiteSpace(byte byteToCheck)
```
    Checks if a byte value is whitespace or not. Whitespace is taken to mean: space, tab, CR, LF
    
    Parameters:
    
    byteToCheck - the byte to check
    
    Returns:
    
    true if byte is whitespace, false otherwise
  - encode
```
public Object encode(Object pObject)
              throws EncoderException
```
    Encodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].
    
    Specified by:
    
    encode in interface Encoder
    
    Parameters:
    
    pObject - Object to encode
    
    Returns:
    
    An object (of type byte[]) containing the Base-N encoded data which corresponds to the byte[] supplied.
    
    Throws:
    
    EncoderException - if the parameter supplied is not of type byte[]
  - encodeToString
```
public String encodeToString(byte[] pArray)
```
    Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.
    
    Parameters:
    
    pArray - a byte array containing binary data
    
    Returns:
    
    A String containing only Base-N character data
  - decode
```
public Object decode(Object pObject)
              throws DecoderException
```
    Decodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.
    
    Specified by:
    
    decode in interface Decoder
    
    Parameters:
    
    pObject - Object to decode
    
    Returns:
    
    An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.
    
    Throws:
    
    DecoderException - if the parameter supplied is not of type byte[]
  - decode
```
public byte[] decode(String pArray)
```
    Decodes a String containing characters in the Base-N alphabet.
    
    Parameters:
    
    pArray - A String containing Base-N character data
    
    Returns:
    
    a byte array containing binary data
  - decode
```
public byte[] decode(byte[] pArray)
```
    Decodes a byte[] containing characters in the Base-N alphabet.
    
    Specified by:
    
    decode in interface BinaryDecoder
    
    Parameters:
    
    pArray - A byte array containing Base-N character data
    
    Returns:
    
    a byte array containing binary data
  - encode
```
public byte[] encode(byte[] pArray)
```
    Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.
    
    Specified by:
    
    encode in interface BinaryEncoder
    
    Parameters:
    
    pArray - a byte array containing binary data
    
    Returns:
    
    A byte array containing only the basen alphabetic character data
  - encodeAsString
```
public String encodeAsString(byte[] pArray)
```
    Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet. Uses UTF8 encoding.
    
    Parameters:
    
    pArray - a byte array containing binary data
    
    Returns:
    
    String containing only character data in the appropriate alphabet.
  - isInAlphabet
```
protected abstract boolean isInAlphabet(byte value)
```
    Returns whether or not the octet is in the current alphabet. Does not allow whitespace or pad.
    
    Parameters:
    
    value - The value to test
    
    Returns:
    
    true if the value is defined in the current alphabet, false otherwise.
  - isInAlphabet
```
public boolean isInAlphabet(byte[] arrayOctet,
                            boolean allowWSPad)
```
    Tests a given byte array to see if it contains only valid characters within the alphabet. The method optionally treats whitespace and pad as valid.
    
    Parameters:
    
    arrayOctet - byte array to test
    
    allowWSPad - if true, then whitespace and PAD are also allowed
    
    Returns:
    
    true if all bytes are valid characters in the alphabet or if the byte array is empty; false, otherwise
  - isInAlphabet
```
public boolean isInAlphabet(String basen)
```
    Tests a given String to see if it contains only valid characters within the alphabet. The method treats whitespace and PAD as valid.
    
    Parameters:
    
    basen - String to test
    
    Returns:
    
    true if all characters in the String are valid characters in the alphabet or if the String is empty; false, otherwise
    
    See Also:
    
    isInAlphabet(byte[], boolean)
  - containsAlphabetOrPad
```
protected boolean containsAlphabetOrPad(byte[] arrayOctet)
```
    Tests a given byte array to see if it contains any characters within the alphabet or PAD. Intended for use in checking line-ending arrays
    
    Parameters:
    
    arrayOctet - byte array to test
    
    Returns:
    
    true if any byte is a valid character in the alphabet or PAD; false otherwise
  - getEncodedLength
```
public long getEncodedLength(byte[] pArray)
```
    Calculates the amount of space needed to encode the supplied array.
    
    Parameters:
    
    pArray - byte[] array which will later be encoded
    
    Returns:
    
    amount of space needed to encoded the supplied array. Returns a long since a max-len array will require > Integer.MAX_VALUE

Class BaseNCodec

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MIME_CHUNK_SIZE

PEM_CHUNK_SIZE

MASK_8BITS

PAD_DEFAULT

PAD

lineLength

buffer

pos

eof

currentLinePos

modulus

Constructor Detail

BaseNCodec

Method Detail

getDefaultBufferSize

ensureBufferSize

isWhiteSpace

encode

encodeToString

decode

decode

decode

encode

encodeAsString

isInAlphabet

isInAlphabet

isInAlphabet

containsAlphabetOrPad

getEncodedLength