?? variableexp.java
字號:
/**
* A variable expression implements BooleanExp
* A terminal expression
*/
import java.util.*;
public class VariableExp implements BooleanExp {
private String name;
public VariableExp(String _name) {
name = _name;
}
public boolean Evaluate(Context c) {
return c.LookUp(name);
}
public BooleanExp Copy() {
return new VariableExp(name);
}
public BooleanExp Replace(String var, BooleanExp exp) {
if(var.equals(name)) {
return exp.Copy();
} else {
return new VariableExp(name);
}
}
}
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