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Var.java
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Var.java
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import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Var Represent the variables that are forming an expression.
* @author Yossi Maatook.
*/
public class Var implements Expression {
private String expressionString;
/**
* Constructor.
* @param s - the var string.
*/
public Var(String s) {
this.expressionString = s;
}
@Override
public Boolean evaluate(Map<String, Boolean> assignment) throws Exception {
try {
return assignment.get(this.expressionString);
} catch (Exception e) {
throw new Exception("Must set" + this.expressionString.toString() + "'s value!");
}
}
@Override
public Boolean evaluate() throws Exception {
throw new Exception("Var has no value!");
}
@Override
public List<String> getVariables() {
List<String> list = new ArrayList<>();
list.add(this.expressionString);
return list;
}
@Override
public String toString() {
return this.expressionString;
}
@Override
public Expression assign(String var, Expression expression) {
if (var.equals(this.expressionString)) {
return expression;
}
return this;
}
@Override
public Expression nandify() {
return this;
}
@Override
public Expression norify() {
return this;
}
@Override
public Expression simplify() {
return this;
}
}