view src/samer/core_/Saver.java @ 0:bf79fb79ee13

Initial Mercurial check in.

package samer.core;

import samer.core.types.*;
import java.io.*;

/** An Agent that manages saving and loading of a Saveable object */

public class Saver implements Agent {
	Saveable	obj;
	VFile			file, txtfile;

	public Saver(Saveable obj) { init(obj); }
	public Saver(Saveable obj, Node node) {
		Shell.push(node); init(obj); Shell.pop();
	}

	public void setName(String n) { file.setFile(new File(n)); }
	public File 	getFile() { return file.getFile(); }

	private void init(Saveable obj) {
		this.obj=obj;
		file = new VFile("file","",0);
		txtfile = new VFile("text file","",0);
	}

	public void load() throws Exception {
		Shell.print("loading "+obj+" from "+file);
		FileInputStream f=new FileInputStream(file.getFile());
		try { obj.load(new BufferedInputStream(f)); } finally { f.close(); }
	}

	public void save() throws Exception {
		Shell.print("saving "+obj+" to "+file);
		OutputStream f=new BufferedOutputStream( new FileOutputStream(file.getFile()));
		try { obj.save(f); } finally { f.close(); }
	}

	public void read() throws Exception {
		Shell.print("loading "+obj+" as text from "+txtfile);
		FileReader f=new FileReader(txtfile.getFile());
		try { obj.read(f); } finally { f.close(); }
	}

	public void write() throws Exception {
		Shell.print("saving "+obj+" as text to "+txtfile);
		Writer w=new BufferedWriter(new FileWriter(txtfile.getFile()));
		try { obj.write(w); } finally { w.close(); }
	}

	public void getCommands(Registry r)
	{
		r.add("load").add("load text");
		r.group();
		r.add("save as").add("save").add("save text");
	}

	public void execute(String cmd, Environment env) throws Exception
	{
		if (cmd.equals("load")) {
			try { 	env.datum().get(file); load(); }
			catch (Exception x) { Shell.print("Error loading: "+x); }
		} else if (cmd.equals("save as")) {
			try { 	env.datum().get(file); txtfile.decode(file.string()+".txt"); save(); }
			catch (Exception x) { Shell.print("Error saving: "+x); }
		} else if (cmd.equals("save")) {
			try { 	save(); }
			catch (Exception x) { Shell.print("Error saving: "+x); }
		} else if (cmd.equals("load text")) {
			try { env.datum().get(txtfile); read(); }
			catch (Exception x) { Shell.print("Error reading: "+x); }
		} else if (cmd.equals("save text")) {
			try { env.datum().get(txtfile); write(); }
			catch (Exception x) { Shell.print("Error writing: "+x); }
		}
	}
}