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 * Open Behavioral Health Information Technology Architecture (OBHITA.org)
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions are met:
 *       * Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *       * Redistributions in binary form must reproduce the above copyright
 *         notice, this list of conditions and the following disclaimer in the
 *         documentation and/or other materials provided with the distribution.
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 *         names of its contributors may be used to endorse or promote products
 *         derived from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package gov.samhsa.consent2share.showcase.service;

import gov.samhsa.acs.common.tool.DocumentAccessor;
import gov.samhsa.acs.common.tool.DocumentXmlConverter;
import gov.samhsa.consent2share.showcase.exception.XmlAttributeSetterException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

/**
 * The Class XmlAttributeSetterImpl.
 */
@Component
public class XmlAttributeSetterImpl implements XmlAttributeSetter {

	/** The document xml converter. */
	@Autowired
	private DocumentXmlConverter documentXmlConverter;

	/** The document accessor. */
	@Autowired
	private DocumentAccessor documentAccessor;

	/*
	 * (non-Javadoc)
	 * 
	 * @see gov.samhsa.consent2share.showcase.service.XmlAttributeSetter#
	 * setAttributeValue(java.lang.String, java.lang.String, java.lang.String,
	 * java.lang.String)
	 */
	@Override
	public String setAttributeValue(String docString, String xPathExpr,
			String attributeName, String newValue)
			throws XmlAttributeSetterException {
		try {
			final Document doc = documentXmlConverter.loadDocument(docString);
			final Node node = documentAccessor.getNode(doc, xPathExpr);
			final Node attribute = node.getAttributes().getNamedItem(
					attributeName);
			if (attribute == null || "".equals(attribute.getNodeValue())) {
				final Node newAttribute = doc.createAttribute(attributeName);
				newAttribute.setNodeValue(newValue);
				node.getAttributes().setNamedItem(newAttribute);
			} else {
				attribute.setNodeValue(newValue);
			}
			doc.normalizeDocument();
			return documentXmlConverter.convertXmlDocToString(doc);
		} catch (final Exception e) {
			throw new XmlAttributeSetterException(e.getMessage(), e);
		}
	}
}