A charset coder, that is, either a decoder or an encoder, consumes bytes (or characters) from an input buffer, translates them, and writes the resulting characters (or bytes) to an output buffer. A coding process terminates for one of four categories of reasons, which are described by instances of this class:
Underflow is reported when there is no more input to be processed, or there is insufficient input and additional input is required. This condition is represented by the unique result object
UNDERFLOW
, whoseisUnderflow
method returnstrue
.Overflow is reported when there is insufficient room remaining in the output buffer. This condition is represented by the unique result object
OVERFLOW
, whoseisOverflow
method returnstrue
.A malformed-input error is reported when a sequence of input units is not well-formed. Such errors are described by instances of this class whose
isMalformed
method returnstrue
and whoselength
method returns the length of the malformed sequence. There is one unique instance of this class for all malformed-input errors of a given length.An unmappable-character error is reported when a sequence of input units denotes a character that cannot be represented in the output charset. Such errors are described by instances of this class whose
isUnmappable
method returnstrue
and whoselength
method returns the length of the input sequence denoting the unmappable character. There is one unique instance of this class for all unmappable-character errors of a given length.
For convenience, the isError
method returns true
for result objects that describe malformed-input and unmappable-character
errors but false
for those that describe underflow or overflow
conditions.
- Since:
- 1.4
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Field Summary
Modifier and TypeFieldDescriptionstatic final CoderResult
Result object indicating overflow, meaning that there is insufficient room in the output buffer.static final CoderResult
Result object indicating underflow, meaning that either the input buffer has been completely consumed or, if the input buffer is not yet empty, that additional input is required. -
Method Summary
Modifier and TypeMethodDescriptionboolean
isError()
Tells whether or not this object describes an error condition.boolean
Tells whether or not this object describes a malformed-input error.boolean
Tells whether or not this object describes an overflow condition.boolean
Tells whether or not this object describes an underflow condition.boolean
Tells whether or not this object describes an unmappable-character error.int
length()
Returns the length of the erroneous input described by this object (optional operation).static CoderResult
malformedForLength
(int length) Static factory method that returns the unique object describing a malformed-input error of the given length.void
Throws an exception appropriate to the result described by this object.toString()
Returns a string describing this coder result.static CoderResult
unmappableForLength
(int length) Static factory method that returns the unique result object describing an unmappable-character error of the given length.
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Field Details
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UNDERFLOW
Result object indicating underflow, meaning that either the input buffer has been completely consumed or, if the input buffer is not yet empty, that additional input is required. -
OVERFLOW
Result object indicating overflow, meaning that there is insufficient room in the output buffer.
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Method Details
-
toString
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isUnderflow
public boolean isUnderflow()Tells whether or not this object describes an underflow condition.- Returns:
true
if, and only if, this object denotes underflow
-
isOverflow
public boolean isOverflow()Tells whether or not this object describes an overflow condition.- Returns:
true
if, and only if, this object denotes overflow
-
isError
public boolean isError()Tells whether or not this object describes an error condition.- Returns:
true
if, and only if, this object denotes either a malformed-input error or an unmappable-character error
-
isMalformed
public boolean isMalformed()Tells whether or not this object describes a malformed-input error.- Returns:
true
if, and only if, this object denotes a malformed-input error
-
isUnmappable
public boolean isUnmappable()Tells whether or not this object describes an unmappable-character error.- Returns:
true
if, and only if, this object denotes an unmappable-character error
-
length
public int length()Returns the length of the erroneous input described by this object (optional operation).- Returns:
- The length of the erroneous input, a positive integer
- Throws:
UnsupportedOperationException
- If this object does not describe an error condition, that is, if theisError
does not returntrue
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malformedForLength
Static factory method that returns the unique object describing a malformed-input error of the given length.- Parameters:
length
- The given length- Returns:
- The requested coder-result object
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unmappableForLength
Static factory method that returns the unique result object describing an unmappable-character error of the given length.- Parameters:
length
- The given length- Returns:
- The requested coder-result object
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throwException
Throws an exception appropriate to the result described by this object.- Throws:
BufferUnderflowException
- If this object isUNDERFLOW
BufferOverflowException
- If this object isOVERFLOW
MalformedInputException
- If this object represents a malformed-input error; the exception's length value will be that of this objectUnmappableCharacterException
- If this object represents an unmappable-character error; the exception's length value will be that of this objectCharacterCodingException
-MalformedInputException
if this object represents a malformed-input error;UnmappableCharacterException
if this object represents an unmappable-character error
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