package com.andrik.worldmonye;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import java.io.BufferedInputStream;
import java.io.Closeable;
import java.io.InputStream;
import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class MainActivity extends Activity {

    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void onButtonClick(View view) {
        TextView textViewRation = (TextView) findViewById(R.id.textViewRation);

        InputStream is = null;
        try {
            DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            URL url = new URL("http://www.boi.org.il/currency.xml");
            is = new BufferedInputStream(url.openStream());
            Document document = documentBuilder.parse(is);
            document.getDocumentElement().normalize();

            NodeList nodes = document.getElementsByTagName("CURRENCY");
            for (int i = 0; i < nodes.getLength(); i++) {
                Node node = nodes.item(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    textViewRation.append("\n");
                    textViewRation.append(getValue("NAME", (Element) node));
                }
            }
        } catch (Throwable e) {
            textViewRation.append("\n\nhas error: " + e);
        } finally {
            closeQuietly(is);
            textViewRation.append("\n\ndone");
        }
    }

    private static CharSequence getValue(String string, Element element) {
        NodeList nodes = element.getElementsByTagName(string).item(0).getChildNodes();
        Node node = (Node) nodes.item(0);
        return node.getNodeValue();
    }

    private static void closeQuietly(Closeable resource) {
        if (resource != null) {
            try { resource.close(); } catch (Exception e) {}
        }
    }
}