Example usage for org.apache.commons.lang3 Validate exclusiveBetween

Introduction

In this page you can find the example usage for org.apache.commons.lang3 Validate exclusiveBetween.

Prototype

public static void exclusiveBetween(final double start, final double end, final double value,
        final String message) 

Source Link

Document

Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception with the specified message.

Usage

From source file:com.thinkbiganalytics.discovery.util.ParserHelper.java

/**
 * Extracts the given number of rows from the file and returns a new reader for the sample.
 * This method protects memory in the case where a large file can be submitted with no delimiters.
 *///from   w w w  . java  2 s .c o  m
public static String extractSampleLines(InputStream is, Charset charset, int rows) throws IOException {

    StringWriter sw = new StringWriter();
    Validate.notNull(is, "empty input stream");
    Validate.notNull(charset, "charset cannot be null");
    Validate.exclusiveBetween(1, MAX_ROWS, rows, "invalid number of sample rows");

    // Sample the file in case there are no newlines
    StringWriter swBlock = new StringWriter();
    IOUtils.copyLarge(new InputStreamReader(is, charset), swBlock, -1, MAX_CHARS);
    try (BufferedReader br = new BufferedReader(new StringReader(swBlock.toString()))) {
        IOUtils.closeQuietly(swBlock);
        String line = br.readLine();
        int linesRead = 0;
        for (int i = 1; i <= rows && line != null; i++) {
            sw.write(line);
            sw.write("\n");
            linesRead++;
            line = br.readLine();
        }
        if (linesRead <= 1 && sw.toString().length() >= MAX_CHARS) {
            throw new IOException("Failed to detect newlines for sample file.");
        }
    }

    return sw.toString();
}

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