package org.peterd.util.process;
	
	import java.io.ByteArrayOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	
	import org.peterd.util.io.StreamCopier;
	
	public class QuickProcess {
		protected String[] cmdLine;
		protected IEnvironmentSetup envSetup;
		protected String output;
		protected int result;
		
		public QuickProcess (String[] cmdLine) {
			this(cmdLine, null);
		}
		
		public QuickProcess (String[] cmdLine, IEnvironmentSetup envSetup) {
			this.cmdLine = cmdLine;
			this.envSetup = envSetup;
			output = null;
		}
		
		protected String[] tweakCmdLine(String[] orig) {
			return orig;
		}
		
		public synchronized void exec() throws IOException {

			ProcessBuilder b = new ProcessBuilder(tweakCmdLine(cmdLine));
			if (envSetup != null) {
				envSetup.setupEnvironment(b.environment());
			}
			b.redirectErrorStream(true);
			java.lang.Process p = b.start();
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			try {
				p.getOutputStream().close();
				InputStream in = p.getInputStream();
				StreamCopier.fullCopy(in,out);
				in.close();
			} catch (IOException e) {
				//ignore?
			}

			output = out.toString();
			try {
				result = p.waitFor();
			} catch (InterruptedException e) {
				throw new RuntimeException("Unexpected thread interruption");
			}
		}
	
		public String[] getCmdLine() {
			return cmdLine;
		}
	
		public String getOutput() {
			if (output == null) throw new IllegalStateException();

			return output;
		}
	
		public int getResult() {
			if (output == null) throw new IllegalStateException();
			return result;
		}
	}