tikhomirov@61: /*
tikhomirov@61:  * Copyright (c) 2011 Artem Tikhomirov 
tikhomirov@61:  */
tikhomirov@61: package com.tmate.hgkit;
tikhomirov@61: 
tikhomirov@61: import java.io.File;
tikhomirov@61: import java.io.IOException;
tikhomirov@61: import java.io.InputStreamReader;
tikhomirov@61: import java.nio.CharBuffer;
tikhomirov@61: import java.util.LinkedList;
tikhomirov@61: 
tikhomirov@61: /**
tikhomirov@61:  *
tikhomirov@61:  * @author artem
tikhomirov@61:  */
tikhomirov@61: public class ExecHelper {
tikhomirov@61: 
tikhomirov@61: 	private final OutputParser parser;
tikhomirov@61: 	private final File dir;
tikhomirov@61: 
tikhomirov@61: 	public ExecHelper(OutputParser outParser, File workingDir) {
tikhomirov@61: 		parser = outParser;
tikhomirov@61: 		dir = workingDir;
tikhomirov@61: 	}
tikhomirov@61: 
tikhomirov@61: 	public void run(String... cmd) throws IOException, InterruptedException {
tikhomirov@61: 		Process p = new ProcessBuilder(cmd).directory(dir).redirectErrorStream(true).start();
tikhomirov@61: //		Process p = Runtime.getRuntime().exec(cmd, null, dir);
tikhomirov@61: 		InputStreamReader stdOut = new InputStreamReader(p.getInputStream());
tikhomirov@61: 		LinkedList<CharBuffer> l = new LinkedList<CharBuffer>();
tikhomirov@61: 		int r = -1;
tikhomirov@61: 		CharBuffer b = null;
tikhomirov@61: 		do {
tikhomirov@61: 			if (b == null || b.remaining() < b.capacity() / 3) {
tikhomirov@61: 				b = CharBuffer.allocate(512);
tikhomirov@61: 				l.add(b);
tikhomirov@61: 			}
tikhomirov@61: 			r = stdOut.read(b);
tikhomirov@61: 		} while (r != -1);
tikhomirov@61: 		int total = 0;
tikhomirov@61: 		for (CharBuffer cb : l) {
tikhomirov@61: 			total += cb.position();
tikhomirov@61: 			cb.flip();
tikhomirov@61: 		}
tikhomirov@61: 		CharBuffer res = CharBuffer.allocate(total);
tikhomirov@61: 		for (CharBuffer cb : l) {
tikhomirov@61: 			res.put(cb);
tikhomirov@61: 		}
tikhomirov@61: 		res.flip();
tikhomirov@61: 		p.waitFor();
tikhomirov@61: 		parser.parse(res);
tikhomirov@61: 	}
tikhomirov@61: }