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RandomFiles.java

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package diffr.util;

import com.google.common.collect.Lists;

import javolution.text.Text;

import java.util.List;

import java.util.Random;

/**

* Utilities for generating random files.

*

* @author Jakub D Kozlowski

* @since 0.3

*/

public final class RandomFiles {

/**

* Gets a randomly generated file of this {@code fileLength} using this {@code seed} to initialise the random

* number generator.

*

* @param fileLength fileLength of the file to generate.

* @param seed initial seed.

*

* @return random file of this {@code fileLength}, generated from this {@code seed}.

*/

public static List<Text> getRandomFile(final long fileLength, final long seed) {

final List<Text> testFile = Lists.newArrayList();

final Random random = new Random(seed);

final char minChar = 33;

final int charRange = 127 - 33 + 1;

for (int i = 0; i < fileLength; i++) {

if (0 == random.nextInt(4) || 0 == testFile.size()) {

final StringBuilder b = new StringBuilder();

final int lineLength = random.nextInt(100) + 1;

for (int j = 0; j < lineLength; j++) {

b.append((char) (minChar + (random.nextInt(charRange))));

}

testFile.add(new Text(b.toString()));

}

else {

testFile.add(testFile.get(random.nextInt(testFile.size())));

}

}

return testFile;

}

}