package org.h2.bnf;
import java.util.HashMap;
public class RuleOptional implements Rule {
private final Rule rule;
private boolean mapSet;
public RuleOptional(Rule rule) {
this.rule = rule;
}
@Override
public void accept(BnfVisitor visitor) {
visitor.visitRuleOptional(rule);
}
@Override
public void setLinks(HashMap<String, RuleHead> ruleMap) {
if (!mapSet) {
rule.setLinks(ruleMap);
mapSet = true;
}
}
@Override
public boolean autoComplete(Sentence sentence) {
sentence.stopIfRequired();
rule.autoComplete(sentence);
return true;
}
}