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FileUtils.java

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import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

/**

* Common file operations used across multiple processing scripts.

*/

public class FileUtils {

/**

* Validates that a file exists and is readable.

*/

public static void validateInputFile(Path inputPath) throws IOException {

if (!Files.exists(inputPath)) {

throw new IOException("ERROR: Input file not found at: %s".formatted(inputPath.toAbsolutePath()));

}

if (!Files.isReadable(inputPath)) {

throw new IOException("ERROR: Input file is not readable: %s".formatted(inputPath.toAbsolutePath()));

}

}

/**

* Safely writes content to a file.

*/

public static void writeOutputFile(Path outputPath, String content) throws IOException {

try {

Files.writeString(outputPath, content);

} catch (IOException e) {

throw new IOException("ERROR: Failed to write output file: %s".formatted(e.getMessage()), e);

}

}

/**

* Reads file content as string.

*/

public static String readFileContent(Path inputPath) throws IOException {

try {

return Files.readString(inputPath);

} catch (IOException e) {

throw new IOException("ERROR: Failed to read input file: %s".formatted(e.getMessage()), e);

}

}

/**

* Gets file statistics.

*/

public static String getFileStats(Path filePath) throws IOException {

var lines = Files.lines(filePath).count();

var size = Files.size(filePath);

return "Lines: %d, Size: %d bytes".formatted(lines, size);

}

/**

* Ensures the temporary directory exists.

*/

public static Path ensureTmpDirectory() throws IOException {

var tmpDir = Path.of(".tmp");

if (!Files.exists(tmpDir)) {

Files.createDirectories(tmpDir);

}

return tmpDir;

}

}