java.nio.charset
Class CoderResult

java.lang.Object
  java.nio.charset.CoderResult

public class CoderResult

extends Object

A description of the result state of a coder.

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, whose isUnderflow method returns true.

• Overflow is reported when there is insufficient room remaining in the output buffer. This condition is represented by the unique result object OVERFLOW, whose isOverflow method returns true.

• 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 returns true and whose length 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 returns true and whose length 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

Author:

Mark Reinhold, JSR-51 Expert Group

Nested Class Summary

private static class

CoderResult.Cache

Field Summary

private static int	CR_ERROR_MIN
private static int	CR_MALFORMED
private static int	CR_OVERFLOW
private static int	CR_UNDERFLOW
private static int	CR_UNMAPPABLE
private int	length
private static CoderResult.Cache	malformedCache
private static String[]	names
static CoderResult	OVERFLOW Result object indicating overflow, meaning that there is insufficient room in the output buffer.
private int	type
static CoderResult	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.
private static CoderResult.Cache	unmappableCache

Constructor Summary

private

CoderResult(int type, int length)

Method Summary

boolean	isError() Tells whether or not this object describes an error condition.
boolean	isMalformed() Tells whether or not this object describes a malformed-input error.
boolean	isOverflow() Tells whether or not this object describes an overflow condition.
boolean	isUnderflow() Tells whether or not this object describes an underflow condition.
boolean	isUnmappable() 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	throwException() Throws an exception appropriate to the result described by this object.
String	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.

Methods inherited from class java.lang.Object

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

Field Detail

CR_UNDERFLOW

private static final int CR_UNDERFLOW

See Also:

Constant Field Values

CR_OVERFLOW

private static final int CR_OVERFLOW

See Also:

Constant Field Values

CR_ERROR_MIN

private static final int CR_ERROR_MIN

See Also:

Constant Field Values

CR_MALFORMED

private static final int CR_MALFORMED

See Also:

Constant Field Values

CR_UNMAPPABLE

private static final int CR_UNMAPPABLE

See Also:

Constant Field Values

names

private static final String[] names

type

private final int type

length

private final int length

UNDERFLOW

public static final CoderResult 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

public static final CoderResult OVERFLOW

Result object indicating overflow, meaning that there is insufficient room in the output buffer.

malformedCache

private static CoderResult.Cache malformedCache

unmappableCache

private static CoderResult.Cache unmappableCache

Constructor Detail

CoderResult

private CoderResult(int type,
                    int length)

Method Detail

toString

public String toString()

Returns a string describing this coder result.

Overrides:

toString in class Object

Returns:

A descriptive string

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 the isError does not return true

malformedForLength

public static CoderResult malformedForLength(int length)

Static factory method that returns the unique object describing a malformed-input error of the given length.

Returns:

The requested coder-result object

unmappableForLength

public static CoderResult unmappableForLength(int length)

Static factory method that returns the unique result object describing an unmappable-character error of the given length.

Returns:

The requested coder-result object

throwException

public void throwException()
                    throws CharacterCodingException

Throws an exception appropriate to the result described by this object.

Throws:

BufferUnderflowException - If this object is UNDERFLOW

BufferOverflowException - If this object is OVERFLOW

MalformedInputException - If this object represents a malformed-input error; the exception's length value will be that of this object

UnmappableCharacterException - If this object represents an unmappable-character error; the exceptions length value will be that of this object

CharacterCodingException