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.IndexContext;
import org.basex.query.util.Var;
import org.basex.util.InputInfo;
import org.basex.util.TokenBuilder;
/**
* Abstract array expression.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public abstract class Arr extends ParseExpr {
/** Expression list. */
public Expr[] expr;
/**
* Constructor.
* @param ii input info
* @param e expression list
*/
protected Arr(final InputInfo ii, final Expr... e) {
super(ii);
expr = e;
}
@Override
public Expr comp(final QueryContext ctx) throws QueryException {
for(int e = 0; e != expr.length; ++e)
expr[e] = checkUp(expr[e].comp(ctx), ctx);
return this;
}
@Override
public boolean uses(final Use u) {
for(final Expr e : expr) if(e.uses(u)) return true;
return false;
}
@Override
public int count(final Var v) {
int c = 0;
for(final Expr e : expr) c += e.count(v);
return c;
}
@Override
public boolean removable(final Var v) {
for(final Expr e : expr) if(!e.removable(v)) return false;
return true;
}
@Override
public Expr remove(final Var v) {
for(int e = 0; e != expr.length; ++e) expr[e] = expr[e].remove(v);
return this;
}
@Override
public Expr indexEquivalent(final IndexContext ic) throws QueryException {
for(int e = 0; e < expr.length; ++e) expr[e] = expr[e].indexEquivalent(ic);
return this;
}
/**
* Returns true if all arguments are values.
* @return result of check
*/
protected final boolean allAreValues() {
for(final Expr e : expr) if(!e.isValue()) return false;
return true;
}
/**
* Returns true if at least one argument is empty, or will yield 0 results.
* @return result of check
*/
final boolean oneIsEmpty() {
for(final Expr e : expr) if(e.isEmpty()) return true;
return false;
}
@Override
public void plan(final Serializer ser) throws IOException {
ser.openElement(this);
for(final Expr e : expr) e.plan(ser);
ser.closeElement();
}
/**
* Prints the array with the specified separator.
* @param sep separator
* @return string representation
*/
protected String toString(final String sep) {
return new TokenBuilder().addSep(expr, sep).toString();
}
}