/**
* Checks if the items can be compared. Items are comparable
*
* @param b second item
* @return result of check
*/
public final boolean comparable(final Item b) {
return type == b.type
|| num() && b.num()
|| (unt() || str()) && (b.str() || b.unt())
|| dur() && b.dur()
|| func();
}
@Override
public void prepare() throws QueryException {
// build data with all documents, to prevent dirty reads
md = new MemData(data);
for (final Item d : docs) {
final MemData docData;
if (d.node()) {
// adding a document node
final ANode doc = (ANode) d;
if (doc.ndType() != NodeType.DOC) UPDOCTYPE.thrw(input, doc);
docData = new MemData(data);
new DataBuilder(docData).build(doc);
} else if (d.str()) {
// adding file(s) from a path
final String docpath = string(d.atom(input));
final String nm = ctx.mprop.random(data.meta.name);
final DirParser p = new DirParser(IO.get(docpath), ctx.prop);
final MemBuilder b = new MemBuilder(nm, p, ctx.prop);
try {
docData = b.build();
} catch (final IOException e) {
throw DOCERR.thrw(input, docpath);
}
} else {
throw STRNODTYPE.thrw(input, this, d.type);
}
md.insert(md.meta.size, -1, docData);
}
// set new names, if needed
final IntList pres = md.doc();
if (pres.size() == 1 && name != null) {
// name is specified and a single document is added: set the name
final byte[] nm = path == null ? name : concat(path, SLASH, name);
md.update(pres.get(0), Data.DOC, nm);
} else if (path != null) {
// path is specified: replace the path of each new document
for (int i = 0, is = pres.size(); i < is; i++) {
final int d = pres.get(i);
final byte[] old = md.text(d, true);
final int p = lastIndexOf(old, '/');
final byte[] nm = p < 0 ? old : subtoken(old, p + 1);
md.update(d, Data.DOC, concat(path, SLASH, nm));
}
}
}
/**
* Checks if the specified item is a string or an empty sequence. Returns a token representation
* or an exception.
*
* @param it item to be checked
* @return item
* @throws QueryException query exception
*/
public final byte[] checkEStr(final Item it) throws QueryException {
if (it == null) return EMPTY;
if (!it.str() && !it.unt()) Err.type(this, AtomType.STR, it);
return it.atom(input);
}
/**
* Checks if the specified expression yields a string. Returns a token representation or an
* exception.
*
* @param e expression to be evaluated
* @param ctx query context
* @return item
* @throws QueryException query exception
*/
public final byte[] checkStr(final Expr e, final QueryContext ctx) throws QueryException {
final Item it = checkItem(e, ctx);
if (!it.str() && !it.unt()) Err.type(this, AtomType.STR, it);
return it.atom(input);
}