im.shs.tick.auto.service.ServicesFiles Maven / Gradle / Ivy
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package im.shs.tick.auto.service;
import lombok.experimental.UtilityClass;
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
/**
* A helper class for reading and writing Services files.
*
* @author SimpleJuly
*/
@UtilityClass
class ServicesFiles {
private static final Charset UTF_8 = StandardCharsets.UTF_8;
/**
* Reads the set of service classes from a service file.
*
* @param input not {@code null}. Closed after use.
* @return a not {@code null Set} of service class names.
* @throws IOException
*/
static Set readServiceFile(InputStream input) throws IOException {
HashSet serviceClasses = new HashSet<>();
try (
InputStreamReader isr = new InputStreamReader(input, UTF_8);
BufferedReader r = new BufferedReader(isr)
) {
String line;
while ((line = r.readLine()) != null) {
int commentStart = line.indexOf('#');
if (commentStart >= 0) {
line = line.substring(0, commentStart);
}
line = line.trim();
if (!line.isEmpty()) {
serviceClasses.add(line);
}
}
return serviceClasses;
}
}
/**
* Writes the set of service class names to a service file.
*
* @param output not {@code null}. Not closed after use.
* @param services a not {@code null Collection} of service class names.
* @throws IOException
*/
static void writeServiceFile(Collection services, OutputStream output) throws IOException {
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, UTF_8));
for (String service : services) {
writer.write(service);
writer.newLine();
}
writer.flush();
}
}