package de.thedevstack.conversationsplus.xmpp;

import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredContentException;
import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredElementException;

import eu.siacs.conversations.xml.Element;

/**
 *
 */
public abstract class IqPacketParser {
    public static Element findRequiredChild(Element element, String elementName, String namespace) throws MissingRequiredElementException {
        Element child = findChild(element, elementName, namespace);
        if (child == null) {
            throw new MissingRequiredElementException(elementName, namespace, element);
        }
        return child;
    }

    public static Element findChild(Element element, String elementName, String namespace) {
        if (null == element) {
            return null;
        }
        return element.findChild(elementName, namespace);
    }

    public static String findRequiredChildContent(Element element, String elementName) throws MissingRequiredContentException {
        if (null == element) {
            return null;
        }
        String childContent = element.findChildContent(elementName);
        if (null == childContent) {
            throw new MissingRequiredContentException(elementName, element);
        }
        return childContent;
    }

    public static String findRequiredChildContent(Element element, String elementName, String namespace) throws MissingRequiredContentException {
        String childContent = findChildContent(element, elementName, namespace);
        if (null == childContent) {
            throw new MissingRequiredContentException(elementName, namespace, element);
        }
        return childContent;
    }

    public static String findChildContent(Element element, String elementName, String namespace) {
        if (null == element) {
            return null;
        }
        return element.findChildContent(elementName, namespace);
    }
}