package org.basex.query.item;
import static org.basex.query.QueryText.*;
import static org.basex.query.util.Err.*;
import java.io.IOException;
import org.basex.io.serial.Serializer;
import org.basex.query.QueryContext;
import org.basex.query.QueryException;
import org.basex.query.expr.Expr;
import org.basex.query.item.SeqType.Occ;
import org.basex.util.InputInfo;
import org.basex.util.Token;
import org.basex.util.Util;
/**
* Sequence, containing at least two items.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public final class ItemSeq extends Seq {
/** Item array. */
private final Item[] item;
/** Sequence type. */
private SeqType seq;
/**
* Constructor.
* @param it items
* @param s size
*/
ItemSeq(final Item[] it, final int s) {
super(s);
item = it;
}
@Override
public Object toJava() throws QueryException {
final Object[] obj = new Object[(int) size];
for(int s = 0; s != size; ++s) obj[s] = item[s].toJava();
return obj;
}
@Override
public Item ebv(final QueryContext ctx, final InputInfo ii)
throws QueryException {
if(!item[0].type.isNode()) CONDTYPE.thrw(ii, this);
return item[0];
}
@Override
public SeqType type() {
if(seq == null) {
Type t = item[0].type;
for(int s = 1; s != size && t != AtomType.ITEM; ++s) {
if(t != item[s].type) t = AtomType.ITEM;
}
seq = SeqType.get(t, Occ.OM);
}
return seq;
}
@Override
public boolean iterable() {
return false;
}
@Override
public boolean sameAs(final Expr cmp) {
if(!(cmp instanceof ItemSeq)) return false;
final ItemSeq is = (ItemSeq) cmp;
return item == is.item && size == is.size;
}
@Override
public int writeTo(final Item[] arr, final int start) {
System.arraycopy(item, 0, arr, start, (int) size);
return (int) size;
}
@Override
public Item itemAt(final long pos) {
return item[(int) pos];
}
@Override
public boolean homogenous() {
// [LW] really check it?
return false;
}
@Override
public void plan(final Serializer ser) throws IOException {
ser.openElement(Token.token(Util.name(this)), SIZE, Token.token(size));
for(int v = 0; v != Math.min(size, 5); ++v) item[v].plan(ser);
ser.closeElement();
}
}