com.sun.msv.reader.ChoiceState Maven / Gradle / Ivy
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package com.sun.msv.reader;
import com.sun.msv.grammar.Expression;
/**
* state that creates ChoiceExp.
*
* @author Kohsuke KAWAGUCHI
*/
public class ChoiceState extends ExpressionWithChildState {
public ChoiceState() {
this(false);
}
public ChoiceState( boolean allowEmptyChoice ) {
this.allowEmptyChoice = allowEmptyChoice;
}
protected boolean allowEmptyChoice;
protected Expression initialExpression() {
return allowEmptyChoice?Expression.nullSet:null;
}
protected Expression castExpression( Expression exp, Expression child ) {
// first one.
if( exp==null ) return child;
else return reader.pool.createChoice(exp,child);
}
}