package org.basex.query.expr;
import java.io.IOException;
import org.basex.io.serial.Serializer;
import org.basex.query.QueryContext;
import org.basex.query.QueryException;
import org.basex.query.util.Var;
import org.basex.util.InputInfo;
/**
* Abstract single expression.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public abstract class Single extends ParseExpr {
/** Expression. */
public Expr expr;
/**
* Constructor.
* @param ii input info
* @param e expression
*/
protected Single(final InputInfo ii, final Expr e) {
super(ii);
expr = e;
}
@Override
public Expr comp(final QueryContext ctx) throws QueryException {
expr = expr.comp(ctx);
return this;
}
@Override
public boolean uses(final Use u) {
return expr.uses(u);
}
@Override
public int count(final Var v) {
return expr.count(v);
}
@Override
public boolean removable(final Var v) {
return expr.removable(v);
}
@Override
public Expr remove(final Var v) {
expr = expr.remove(v);
return this;
}
@Override
public void plan(final Serializer ser) throws IOException {
ser.openElement(this);
expr.plan(ser);
ser.closeElement();
}
}