Identifier.java

Identifier

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package expression;
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An Identifier consists only of the name of the identifier. This class is only needed as a wrapper which allows us to use an identifier as an expression. 

public class Identifier extends Expression {
    public final String name;

    public Identifier(String name) {
        this.name = name;
    }
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    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Identifier that = (Identifier) o;

        return name.equals(that.name);

    }
}