org.unix4j.unix.grep.CountMatchingLinesProcessor Maven / Gradle / Ivy
package org.unix4j.unix.grep;
import org.unix4j.context.ExecutionContext;
import org.unix4j.io.FileInput;
import org.unix4j.io.Input;
import org.unix4j.line.Line;
import org.unix4j.line.SimpleLine;
import org.unix4j.processor.DefaultInputProcessor;
import org.unix4j.processor.LineProcessor;
import org.unix4j.util.Counter;
/**
* Counts the matching lines and writes the count and the file name to the
* output. The matching operation is delegated to the {@link LineMatcher} passed
* to the constructor.
*/
final class CountMatchingLinesProcessor extends DefaultInputProcessor implements LineProcessor {
private final ExecutionContext context;
private final LineMatcher matcher;
private final Counter counter = new Counter();
private final LineProcessor output;
public CountMatchingLinesProcessor(GrepCommand command, ExecutionContext context, LineProcessor output, LineMatcher matcher) {
this.context = context;
this.matcher = matcher;
this.output = output;
}
@Override
public void begin(Input input, LineProcessor output) {
counter.reset();
}
@Override
public boolean processLine(Line line) {
if (matcher.matches(line)) {
counter.increment();
}
return true;// we want to count all the lines
}
@Override
public boolean processLine(Input input, Line line, LineProcessor output) {
return processLine(line);
}
@Override
public void finish(Input input, LineProcessor output) {
final String fileInfo = input instanceof FileInput ? ((FileInput)input).getFileInfo(context.getCurrentDirectory()) : input.toString();
output.processLine(new SimpleLine(counter.getCount() + ": " + fileInfo));
}
@Override
public void finish() {
output.processLine(new SimpleLine(String.valueOf(counter.getCount())));
output.finish();
}
}