@Override
public Paper getByDoi(String doi) {
log.debug("getByDoi: {}", doi);
Paper paper = new Paper();
paper.setDOI(doi);
Set<Paper> result = getByExample(paper, "isPublic");
if (result.size() == 0) {
throw new IllegalStateException(MessageFormat.format("no paper with DOI: \"{0}\"", doi));
} else if (result.size() > 1) {
throw new IllegalStateException(
MessageFormat.format("more than one paper with DOI: \"{0}\"", doi));
}
return result.iterator().next();
}
@Override
public Paper getByTitle(String title) {
log.debug("getByTitle: {}", title);
Paper paper = new Paper();
paper.setTitle(title);
Set<Paper> result = getByExample(paper, "isPublic");
if (result.size() > 1) {
// should never happen because title is a unique key
throw new IllegalStateException(
MessageFormat.format("more than one paper with title: \"{0}\"", title));
} else if (result.size() == 0) {
return null;
}
return result.iterator().next();
}
