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package bjc.dicelang;
import java.util.Map;
/**
* A dice expression that refers to a variable bound in a mutable
* enviroment
*
* @author ben
*
*/
public class ReferenceDiceExpression implements IDiceExpression {
/**
* The enviroment to do variable dereferencing against
*/
private Map<String, IDiceExpression> env;
/**
* The name of the bound variable
*/
private String name;
/**
* Create a new reference dice expression referring to the given name
* in an enviroment
*
* @param name
* The name of the bound variable
* @param env
* The enviroment to resolve the variable against
*/
public ReferenceDiceExpression(String name,
Map<String, IDiceExpression> env) {
this.name = name;
this.env = env;
}
/**
* Get the name of the referenced variable
*
* @return the name of the referenced variable
*/
public String getName() {
return name;
}
/*
* (non-Javadoc)
*
* @see bjc.utils.dice.IDiceExpression#roll()
*/
@Override
public int roll() {
if (!env.containsKey(name)) {
throw new UnsupportedOperationException(
"Attempted to reference undefined variable " + name);
}
return env.get(name).roll();
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
if (env.containsKey(name)) {
return env.get(name).toString();
}
return name;
}
}
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