EditEntityFile.java

package jo.sm.ent.cmd;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import jo.sm.ent.data.Tag;
import jo.sm.ent.logic.TagLogic;
import jo.sm.ent.logic.TagUtils;

public class EditEntityFile {

    private String[] mArgs;
    private File mTestFile;

    public EditEntityFile(String[] argv) {
        mArgs = argv;
    }

    public void run() {
        parseArgs();
        try {
            FileInputStream fis = new FileInputStream(mTestFile);
            Tag obj = TagLogic.readFile(fis, true);
            for (int i = 1; i < mArgs.length; i += 3) {
                edit(obj, mArgs[i], mArgs[i + 1], mArgs[i + 2]);
            }
            FileOutputStream fos = new FileOutputStream(mTestFile);
            TagLogic.writeFile(obj, fos, true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void edit(Tag root, String id, String op, String val) {
        Tag obj = TagUtils.lookup(root, id);
        if (obj == null) {
            System.err.println("Cannot find '" + id + "'");
            return;
        }
        try {
            if ("=".equals(op)) {
                TagUtils.set(obj, val);
            } else if ("+=".equals(op)) {
                TagUtils.incr(obj, val);
            } else if ("-=".equals(op)) {
                TagUtils.decr(obj, val);
            } else {
                System.err.println("Cannot find '" + id + "'");
                return;
            }
        } catch (Exception e) {
            System.err.println(e.getLocalizedMessage());
            return;
        }
        TagUtils.dump(obj, "");
    }

    private void parseArgs() {
        if (mArgs.length == 0) {
            System.err.println("Arg1 = filename");
            System.err.println("Arg2 = path to object");
            System.err.println("Arg3 = operation (=, +=, -=)");
            System.err.println("Arg4 = value");
            System.exit(0);
        }
        mTestFile = new File(mArgs[0]);
    }

    public static void main(String[] argv) {
        EditEntityFile app = new EditEntityFile(argv);
        app.run();
    }
}