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package bjc.rgens.newparser;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import java.util.Random;
/**
* A rule in a randomized grammar.
*
* @author EVE
*
*/
public class Rule {
/**
* The name of this grammar rule.
*/
public final String ruleName;
private IList<RuleCase> ruleCases;
/**
* Create a new grammar rule.
*
* @param ruleName
* The name of the grammar rule.
*
* @throws IllegalArgumentException
* If the rule name is invalid.
*/
public Rule(String ruleName) {
if(ruleName == null) {
throw new NullPointerException("Rule name must not be null");
} else if(ruleName.equals("")) {
throw new IllegalArgumentException("The empty string is not a valid rule name");
}
this.ruleName = ruleName;
ruleCases = new FunctionalList<>();
}
/**
* Adds a case to the rule.
*
* @param cse
* The case to add.
*/
public void addCase(RuleCase cse) {
if(cse == null) {
throw new NullPointerException("Case must not be null");
}
ruleCases.add(cse);
}
/**
* Get a random case from this rule.
*
* @return A random case from this rule.
*/
public RuleCase getCase() {
return ruleCases.randItem();
}
/**
* Get a random case from this rule.
*
* @param rnd
* The random number generator to use.
*
* @return A random case from this rule.
*/
public RuleCase getCase(Random rnd) {
return ruleCases.randItem(rnd::nextInt);
}
/**
* Get all the cases of this rule.
*
* @return All the cases in this rule.
*/
public IList<RuleCase> getCases() {
return ruleCases;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((ruleCases == null) ? 0 : ruleCases.hashCode());
result = prime * result + ((ruleName == null) ? 0 : ruleName.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if(this == obj) return true;
if(obj == null) return false;
if(!(obj instanceof Rule)) return false;
Rule other = (Rule) obj;
if(ruleCases == null) {
if(other.ruleCases != null) return false;
} else if(!ruleCases.equals(other.ruleCases)) return false;
if(ruleName == null) {
if(other.ruleName != null) return false;
} else if(!ruleName.equals(other.ruleName)) return false;
return true;
}
@Override
public String toString() {
return String.format("Rule [ruleName='%s', ruleCases=%s]", ruleName, ruleCases);
}
}
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