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putData

Class: matlab.net.http.io.StringConsumer
Package: matlab.net.http.io

Append next buffer of string data to response

Syntax

[len,stop] = putData(consumer,data)

Description

[len,stop] = putData(consumer,data) converts data to a Unicode® string using the current value of the Charset property and appends the results to Response.Body.Data. During this process the currently converted string is at Response.Body.Data. If the TextType property is 'char', then only characters up to CurrenLength are valid.

If data is [], it indicates the end of the message. On return, Response.Body.Data contains the entire converted string or character vector.

For multibyte encodings such as UTF-8, it is possible that a given buffer of data ends with a partial multibyte character. In that case Response.Body.Data might be missing that last character, until the next call to putData completes it.

This method is an overridden method of ContentConsumer.putData. If you implement a subclass of this consumer and want to examine the raw bytes before the charset conversion, then override this method, examine data, change the Charset property if necessary, and then pass data to this superclass method for conversion and storage in Response.Body.Data. If you change Charset after putData has already been called to process previous buffers, be aware that a partial multibyte character at the end of the previous buffer that has not yet been converted could be lost. This would not occur if all characters previously received are single-byte (for example, US-ASCII or the ASCII subset of UTF-8).

A more likely scenario is that you want to examine each buffer of data as it arrives after charset conversion. To do so, override this method as follows (this works whether TextType is char or string):

function [len, stop] = putData(obj, data)
    oldLength = obj.CurrentLength;                
    % send raw bytes to StringConsumer for conversion
    [len, stop] = obj.putData@matlab.net.http.io.StringConsumer(data);
    newData = obj.Response.Body.Data.extractAfter(oldLength);
    % ...process newData...

Now newData contains the most recently added data, after conversion. Note that the above pattern still stores the resulting string in Response.Body.Data.

If your subclass wants to stream its own results into the response after processing the string, use the convert method to convert your data based on the TextType and Charset in this object. In that case, call this putData method only at the end of the data, with an empty argument.

Input Arguments

expand all

Content consumer, specified as a matlab.net.http.io.StringConsumer object.

Buffer of raw data in a matlab.net.http.ResponseMessage object, specified as a nonempty uint8 vector, uint8.empty, or []. For more information about these values, see the data input argument for the ContentConsumer.putData method.

Output Arguments

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Length of data processed, returned as double or empty double. For more information, see the size argument in ContentConsumer.putData.

Indicate whether to receive further data from this message, returned as true or false. For more information, see the stop argument in ContentConsumer.putData.

Attributes

Accesspublic

Examples

For an example subclassing this method, see the PricesStreamer class putData method in Display Streamed Data in Figure Window.

Introduced in R2018a