Example usage for org.springframework.core.io.buffer DataBufferUtils matcher

Introduction

In this page you can find the example usage for org.springframework.core.io.buffer DataBufferUtils matcher.

Prototype

public static Matcher matcher(byte[]... delimiters) 

Source Link

Document

Return a Matcher for the given delimiters.

Usage

From source file:org.springframework.http.codec.multipart.DefaultMultipartMessageReader.java

/**
 * Finds the fist occurrence of the boundary in the given stream of data buffers, and skips
 * all data until then. Note that the first boundary of a multipart message does not contain
 * the initial \r\n, hence the need for a special boundary matcher.
 *//*from  w w w. j a va2 s .  c o  m*/
private static Flux<DataBuffer> skipUntilFirstBoundary(Flux<DataBuffer> dataBuffers, byte[] boundary) {
    byte[] needle = concat(FIRST_BOUNDARY_PREFIX, boundary);
    DataBufferUtils.Matcher matcher = DataBufferUtils.matcher(needle);
    AtomicBoolean found = new AtomicBoolean();

    return dataBuffers.concatMap(dataBuffer -> {
        if (found.get()) {
            return Mono.just(dataBuffer);
        } else {
            int endIdx = matcher.match(dataBuffer);
            if (endIdx != -1) {
                found.set(true);
                int length = dataBuffer.writePosition() - 1 - endIdx;
                DataBuffer slice = dataBuffer.retainedSlice(endIdx + 1, length);
                DataBufferUtils.release(dataBuffer);
                if (logger.isTraceEnabled()) {
                    logger.trace("Found first boundary at " + endIdx + " in " + toString(dataBuffer));
                }
                return Mono.just(slice);
            } else {
                DataBufferUtils.release(dataBuffer);
                return Mono.empty();
            }
        }
    });
}

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