package foo;

import java.util.HashMap;
import java.util.Map;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;

public class JNDITree {

    private Context context = null;

    public static void main(String[] args) throws Exception {
        System.out.println("starting..");
        new JNDITree().printJNDITree("");
        System.out.println("DONE");
    }

    public JNDITree() throws NamingException {
        setEnv();
    }

    private void setEnv() throws NamingException {
        Map<String, String> env = new HashMap();
        context = new InitialContext();
        System.out.println(context.getEnvironment().toString());
    }

    private void printJNDITree(String ct) {
        try {
            printNE(context.list(ct), ct);
        } catch (NamingException e) {
            System.out.println(e.toString());
        }
    }

    private void printNE(NamingEnumeration ne, String parentctx) throws NamingException {
        while (ne.hasMoreElements()) {
            NameClassPair next = (NameClassPair) ne.nextElement();
            printEntry(next);
            increaseIndent();
            printJNDITree((parentctx.length() == 0) ? next.getName() : parentctx + "/" + next.getName());
            decreaseIndent();
        }
    }

    private void printEntry(NameClassPair next) {
        System.out.println(printIndent() + "-->" + next);
    }

    private int indentLevel = 0;

    private void increaseIndent() {
        indentLevel += 4;
    }

    private void decreaseIndent() {
        indentLevel -= 4;
    }

    private String printIndent() {
        StringBuffer buf = new StringBuffer(indentLevel);
        for (int i = 0; i < indentLevel; i++) {
            buf.append(" ");
        }
        return buf.toString();
    }
}