package org.basex.query.expr;
import org.basex.query.QueryContext;
import org.basex.query.QueryException;
import org.basex.query.QueryText;
import org.basex.query.item.Item;
import org.basex.query.item.SeqType;
import org.basex.query.item.map.Map;
import org.basex.util.InputInfo;
import org.basex.util.TokenBuilder;
/**
* A literal map expression.
*
* @author BaseX Team 2005-12, BSD License
* @author Leo Woerteler
*/
public final class LitMap extends Arr {
/**
* Constructor.
* @param ii input info
* @param e key and value expression, interleaved
*/
public LitMap(final InputInfo ii, final Expr[] e) {
super(ii, e);
type = SeqType.MAP_O;
}
@Override
public Item item(final QueryContext ctx, final InputInfo ii)
throws QueryException {
Map map = Map.EMPTY;
for(int i = 0; i < expr.length; i++) {
map = map.insert(checkItem(expr[i], ctx), ctx.value(expr[++i]), ii);
}
return map;
}
@Override
public Expr comp(final QueryContext ctx) throws QueryException {
super.comp(ctx);
return allAreValues() ? preEval(ctx) : this;
}
@Override
public String toString() {
final TokenBuilder tb = new TokenBuilder("map { ");
boolean key = true;
for(final Expr e : expr) {
tb.add(key ? tb.size() > 6 ? ", " : "" : ":=").add(e.toString());
key ^= true;
}
return tb.add(" }").toString();
}
@Override
public boolean uses(final Use u) {
return u == Use.X30 || super.uses(u);
}
@Override
public String description() {
return QueryText.MAPSTR;
}
}