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Spring XML Unmarshalling with XOM

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package com.itelg.spring.xom.unmarshaller.parser.resolver;

import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.springframework.oxm.UnmarshallingFailureException;

import com.itelg.spring.xom.unmarshaller.parser.Parser;
import com.itelg.spring.xom.unmarshaller.parser.ParserHolder;
import com.itelg.xpath.helper.XPathHelper;

import nu.xom.Element;

public class ParserResolver
{
    private ParserResolver()
    {
    }

    public static Parser resolve(List holders, Element rootElement)
    {
        String rootTag = rootElement.getLocalName().toLowerCase();

        for (ParserHolder holder : holders)
        {
            // Resolve via xpath-expression
            if (holder.getXPathExpression() != null && XPathHelper.hasNode(holder.getXPathExpression(), rootElement))
            {
                if (holder.getXpathExpressionValue() == null)
                {
                    return holder.getParser();
                }
                // Resolve via xpath-expression and value
                else
                {
                    String value = XPathHelper.getString(holder.getXPathExpression(), rootElement);

                    if (StringUtils.equals(holder.getXpathExpressionValue(), value))
                    {
                        return holder.getParser();
                    }
                }
            }

            // Resolve via root-tag
            for (String supportedRootTag : holder.getSupportedRootTags())
            {
                if (rootTag.equalsIgnoreCase(supportedRootTag))
                {
                    return holder.getParser();
                }
            }
        }

        throw new UnmarshallingFailureException("No parser applied (Root-Tag: " + rootElement.getLocalName() + ")");
    }
}