org.basex.query.func.map.MapForEach Maven / Gradle / Ivy
package org.basex.query.func.map;
import org.basex.query.*;
import org.basex.query.expr.*;
import org.basex.query.func.*;
import org.basex.query.func.update.*;
import org.basex.query.value.*;
import org.basex.query.value.item.*;
import org.basex.query.value.map.*;
import org.basex.query.value.seq.*;
import org.basex.query.value.type.*;
/**
* Function implementation.
*
* @author BaseX Team 2005-22, BSD License
* @author Leo Woerteler
*/
public class MapForEach extends StandardFunc {
@Override
public final Value value(final QueryContext qc) throws QueryException {
final XQMap map = toMap(exprs[0], qc);
final FItem func = toFunction(exprs[1], 2, this instanceof UpdateMapForEach, qc);
final ValueBuilder vb = new ValueBuilder(qc);
map.apply((i, v) -> vb.add(func.invoke(qc, info, i, v)));
return vb.value(this);
}
@Override
protected final Expr opt(final CompileContext cc) throws QueryException {
final Expr expr1 = exprs[0];
if(expr1 == XQMap.empty()) return Empty.VALUE;
final Type type1 = expr1.seqType().type;
if(type1 instanceof MapType) {
final MapType mtype1 = (MapType) type1;
final SeqType declType1 = mtype1.argTypes[0].with(Occ.EXACTLY_ONE);
exprs[1] = coerceFunc(exprs[1], cc, SeqType.ITEM_ZM, declType1, mtype1.declType);
}
final boolean updating = this instanceof UpdateMapForEach;
final FuncType ft = exprs[1].funcType();
if(ft != null && !updating) exprType.assign(ft.declType.type);
return this;
}
}