package org.basex.query.ft;
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.expr.ParseExpr;
import org.basex.query.item.FTNode;
import org.basex.query.item.SeqType;
import org.basex.query.iter.FTIter;
import org.basex.query.util.IndexContext;
import org.basex.query.util.Var;
import org.basex.util.InputInfo;
/**
* This class defines is an abstract class for full-text expressions.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public abstract class FTExpr extends ParseExpr {
/** Expression list. */
public final FTExpr[] expr;
/**
* Constructor.
* @param ii input info
* @param e expression
*/
FTExpr(final InputInfo ii, final FTExpr... e) {
super(ii);
expr = e;
type = SeqType.BLN;
}
@Override
public FTExpr comp(final QueryContext ctx) throws QueryException {
for(int e = 0; e != expr.length; ++e) expr[e] = expr[e].comp(ctx);
return this;
}
/**
* This method is called by the sequential full-text evaluation.
* @param ctx query context
* @return resulting item
* @throws QueryException query exception
*/
@Override
public abstract FTNode item(final QueryContext ctx, final InputInfo ii)
throws QueryException;
/**
* This method is called by the index-based full-text evaluation.
* @param ctx query context
* @return resulting item
* @throws QueryException query exception
*/
@Override
public abstract FTIter iter(final QueryContext ctx) throws QueryException;
@Override
public boolean uses(final Use u) {
for(final FTExpr e : expr) if(e.uses(u)) return true;
return false;
}
@Override
public int count(final Var v) {
int c = 0;
for(final FTExpr 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 FTExpr remove(final Var v) {
for(int e = 0; e != expr.length; ++e) expr[e] = expr[e].remove(v);
return this;
}
@Override
public FTExpr indexEquivalent(final IndexContext ic) throws QueryException {
for(int e = 0; e != expr.length; ++e) expr[e] = expr[e].indexEquivalent(ic);
return this;
}
/**
* Checks if sub expressions of a mild not operator violate the grammar.
* @return result of check
*/
boolean usesExclude() {
for(final FTExpr e : expr) if(e.usesExclude()) return true;
return false;
}
@Override
public void plan(final Serializer ser) throws IOException {
ser.openElement(this);
for(final FTExpr e : expr) e.plan(ser);
ser.closeElement();
}
/**
* Prints the array with the specified separator.
* @param sep separator
* @return string representation
*/
final String toString(final Object sep) {
final StringBuilder sb = new StringBuilder();
for(int e = 0; e != expr.length; ++e) {
sb.append(e != 0 ? sep.toString() : "").append(expr[e]);
}
return sb.toString();
}
}