@Override
public void updateMetaNameContent(String name,
                                  String content) {
  NodeList<Element> metaTagList = Document.get()
                                          .getElementsByTagName("meta");
  for (int i = 0; i < metaTagList.getLength(); i++) {
    if (metaTagList.getItem(i) instanceof MetaElement) {
      MetaElement nodeListElement = (MetaElement) metaTagList.getItem(i);
      if (!Objects.isNull(nodeListElement.getName())) {
        if (nodeListElement.getName()
                           .equals(name)) {
          nodeListElement.removeFromParent();
          break;
        }
      }
    }
  }
  MetaElement metaElement = Document.get()
                                    .createMetaElement();
  metaElement.setName("name");
  metaElement.setContent("content");
  Element headerElement = getHeaderNode();
  if (!Objects.isNull(headerElement)) {
    headerElement.appendChild(metaElement);
  }
}
 

/**
 * Return the first meta tag from the head section with name matching. <br>
 * If createIfMissing the tag is created and added at the end of the head section.<br>
 * <p>
 * <strong>Note : </strong> the name is case insensitive
 * </p>
 *
 * @param name the name attribute of the metta tag
 * @param createIfMissing create the tag in the head section if missing
 * @return meta tag element or null
 */
public static MetaElement getDescriptionTag(String name, boolean createIfMissing) {
	Document doc = Document.get();
	HeadElement head = doc.getHead();
	assert head != null : "No head section found in the document";
	assert name != null : "the name must not be null";

	NodeList<Element> tags = head.getElementsByTagName("meta");
	MetaElement metaTag = null;
	for (int i = 0; i < tags.getLength(); i++) {
		metaTag = (MetaElement) tags.getItem(i);
		if (name.equalsIgnoreCase(metaTag.getName())) {
			return metaTag;
		}
	}
	if (createIfMissing) {
		metaTag = doc.createMetaElement();
		metaTag.setName(name);
		head.appendChild(metaTag);
	}
	return metaTag;
}
 

@Override
public void updateMetaPropertyContent(String property,
                                      String content) {
  NodeList<Element> metaTagList = Document.get()
                                          .getElementsByTagName("meta");
  for (int i = 0; i < metaTagList.getLength(); i++) {
    if (metaTagList.getItem(i) instanceof MetaElement) {
      MetaElement nodeListElement = (MetaElement) metaTagList.getItem(i);
      if (!Objects.isNull(nodeListElement.getAttribute("property"))) {
        if (nodeListElement.getAttribute("property")
                           .equals(property)) {
          nodeListElement.removeFromParent();
          break;
        }
      }
    }
  }
  MetaElement metaElement = Document.get()
                                    .createMetaElement();
  metaElement.setAttribute("property",
                           property);
  metaElement.setContent("content");
  Element headerElement = getHeaderNode();
  if (!Objects.isNull(headerElement)) {
    headerElement.appendChild(metaElement);
  }
}
 

private void addMetaElements() {
	logger.info("Add viewport");
	MetaElement element = Document.get().createMetaElement();
	element.setName("viewport");
	element.setContent("width=device-width, initial-scale=1.0");

	NodeList<Element> node = Document.get().getElementsByTagName("head");
	Element elementHead = node.getItem(0);
	elementHead.appendChild(element);
}
 

protected void setContentCharset() {
    rta.addInitializeHandler(event -> {
        IFrameElement iFrameElement = IFrameElement.as(rta.getElement());
        HeadElement headElement = iFrameElement.getContentDocument().getHead();

        MetaElement charsetMetaElement = Document.get().createMetaElement();
        charsetMetaElement.setHttpEquiv(HttpHeaders.CONTENT_TYPE);
        charsetMetaElement.setContent(HttpHeaders.CONTENT_TYPE_TEXT_HTML_UTF8);

        headElement.appendChild(charsetMetaElement);
    });
}
 

private void init() {
	NodeList<Element> tags = Document.get().getElementsByTagName("meta");
	for (int i = 0; i < tags.getLength(); i++) {
		MetaElement metaTag = (MetaElement) tags.getItem(i);
		String metaName = metaTag.getName();
		String metaContent = metaTag.getContent();
		if (META_NAME_CSRF_TOKEN.equals(metaName) && !Strings.isNullOrEmpty(metaContent)) {
			this.token = metaContent;
		}
		if (META_NAME_CSRF_HEADER.equals(META_NAME_CSRF_HEADER) && !Strings.isNullOrEmpty(metaContent)) {
			this.header = metaContent;
		}
	}
}