CharsetDecoder

Constructs a new CharsetDecoder using the given Charset, average number and maximum number of characters created by this decoder for one input byte, and the default replacement string "?".

Gets the average number of characters created by this decoder for a single input byte.

Gets the Charset which this decoder uses.

Decodes bytes starting at the current position of the given input buffer, and writes the equivalent character sequence into the given output buffer from its current position.

The buffers' position will be changed with the reading and writing operation, but their limits and marks will be kept intact.

A CoderResult instance will be returned according to following rules:

• CoderResult.OVERFLOW indicates that even though not all of the input has been processed, the buffer the output is being written to has reached its capacity. In the event of this code being returned this method should be called once more with an out argument that has not already been filled.
• CoderResult.UNDERFLOW indicates that as many bytes as possible in the input buffer have been decoded. If there is no further input and no remaining bytes in the input buffer then this operation may be regarded as complete. Otherwise, this method should be called once more with additional input.
• A malformed input result indicates that some malformed input error has been encountered, and the erroneous bytes start at the input buffer's position and their number can be got by result's length. This kind of result can be returned only if the malformed action is CodingErrorAction.REPORT.
• A unmappable character result indicates that some unmappable character error has been encountered, and the erroneous bytes start at the input buffer's position and their number can be got by result's length. This kind of result can be returned only if the unmappable character action is CodingErrorAction.REPORT.

The endOfInput parameter indicates that the invoker cannot provide further input. This parameter is true if and only if the bytes in current input buffer are all inputs for this decoding operation. Note that it is common and won't cause an error if the invoker sets false and then can't provide more input, while it may cause an error if the invoker always sets true in several consecutive invocations. This would make the remaining input to be treated as malformed input.

This method invokes the decodeLoop method to implement the basic decode logic for a specific charset.

This is a facade method for the decoding operation.

This method decodes the remaining byte sequence of the given byte buffer into a new character buffer. This method performs a complete decoding operation, resets at first, then decodes, and flushes at last.

This method should not be invoked while another decode operation is ongoing.

Gets the charset detected by this decoder; this method is optional.

If implementing an auto-detecting charset, then this decoder returns the detected charset from this method when it is available. The returned charset will be the same for the rest of the decode operation.

If insufficient bytes have been read to determine the charset, an IllegalStateException will be thrown.

The default implementation always throws UnsupportedOperationException, so it should be overridden by a subclass if needed.

Flushes this decoder. This method will call implFlush. Some decoders may need to write some characters to the output buffer when they have read all input bytes; subclasses can override implFlush to perform the writing operation.

The maximum number of written bytes won't be larger than out.remaining(). If some decoder wants to write more bytes than an output buffer's remaining space allows, then a CoderResult.OVERFLOW will be returned, and this method must be called again with a character buffer that has more remaining space. Otherwise this method will return CoderResult.UNDERFLOW, which means one decoding process has been completed successfully.

During the flush, the output buffer's position will be changed accordingly, while its mark and limit will be intact.

Indicates whether this decoder implements an auto-detecting charset.

Indicates whether this decoder has detected a charset; this method is optional.

If this decoder implements an auto-detecting charset, then this method may start to return true during decoding operation to indicate that a charset has been detected in the input bytes and that the charset can be retrieved by invoking the detectedCharset method.

Note that a decoder that implements an auto-detecting charset may still succeed in decoding a portion of the given input even when it is unable to detect the charset. For this reason users should be aware that a false return value does not indicate that no decoding took place.

The default implementation always throws an UnsupportedOperationException; it should be overridden by a subclass if needed.

Gets this decoder's CodingErrorAction when malformed input occurred during the decoding process.

Gets the maximum number of characters which can be created by this decoder for one input byte, must be positive.

Sets this decoder's action on malformed input errors. This method will call the implOnMalformedInput method with the given new action as argument.

Sets this decoder's action on unmappable character errors. This method will call the implOnUnmappableCharacter method with the given new action as argument.

Sets the new replacement string. This method first checks the given replacement's validity, then changes the replacement value, and at last calls the implReplaceWith method with the given new replacement as argument.

Gets the replacement string, which is never null or empty.

Resets this decoder. This method will reset the internal status, and then calls implReset() to reset any status related to the specific charset.

Gets this decoder's CodingErrorAction when an unmappable character error occurred during the decoding process.

Decodes bytes into characters. This method is called by the decode method.

This method will implement the essential decoding operation, and it won't stop decoding until either all the input bytes are read, the output buffer is filled, or some exception is encountered. Then it will return a CoderResult object indicating the result of current decoding operation. The rules to construct the CoderResult are the same as for decode. When an exception is encountered in the decoding operation, most implementations of this method will return a relevant result object to the decode method, and some performance optimized implementation may handle the exception and implement the error action itself.

The buffers are scanned from their current positions, and their positions will be modified accordingly, while their marks and limits will be intact. At most in.remaining() characters will be read, and out.remaining() bytes will be written.

Note that some implementations may pre-scan the input buffer and return a CoderResult.UNDERFLOW until it receives sufficient input.

Flushes this decoder. The default implementation does nothing and always returns CoderResult.UNDERFLOW; this method can be overridden if needed.

Notifies that this decoder's CodingErrorAction specified for malformed input error has been changed. The default implementation does nothing; this method can be overridden if needed.

Notifies that this decoder's CodingErrorAction specified for unmappable character error has been changed. The default implementation does nothing; this method can be overridden if needed.

Notifies that this decoder's replacement has been changed. The default implementation does nothing; this method can be overridden if needed.

Reset this decoder's charset related state. The default implementation does nothing; this method can be overridden if needed.