/**
* Check whether a resource is valid. A valid resource must have a non-blank ID, a non-blank link
* and a media type.
*
* @param book the book the resource is for
* @param resource the resource to check
* @return whether the resource is valid
*/
private static boolean isValidResource(final Book book, final Resource resource) {
if (resource == null
|| (resource.getMediaType() == MediatypeService.NCX
&& book.getSpine().getTocResource() != null)) {
return false;
}
if (StringUtil.isBlank(resource.getId())) {
LOGGER.error(
"resource id must not be blank (href: "
+ resource.getHref()
+ ", mediatype:"
+ resource.getMediaType()
+ ")");
return false;
}
if (StringUtil.isBlank(resource.getHref())) {
LOGGER.error(
"resource href must not be blank (id: "
+ resource.getId()
+ ", mediatype:"
+ resource.getMediaType()
+ ")");
return false;
}
if (resource.getMediaType() == null) {
LOGGER.error(
"resource media type must be specified (id: "
+ resource.getId()
+ ", href:"
+ resource.getHref()
+ ")");
return false;
}
return true;
}
private String getPackageResourceHref(Resources resources) {
String defaultResult = "OEBPS/content.opf";
String result = defaultResult;
Resource containerResource = resources.remove("META-INF/container.xml");
if (containerResource == null) {
return result;
}
try {
Document document = ResourceUtil.getAsDocument(containerResource);
Element rootFileElement =
(Element)
((Element) document.getDocumentElement().getElementsByTagName("rootfiles").item(0))
.getElementsByTagName("rootfile")
.item(0);
result = rootFileElement.getAttribute("full-path");
} catch (Exception e) {
log.error(e.getMessage(), e);
}
if (StringUtil.isBlank(result)) {
result = defaultResult;
}
return result;
}