Unary.java

package net.iplantevin.ql.ast.expressions.operators;

import net.iplantevin.ql.ast.LineInfo;
import net.iplantevin.ql.ast.expressions.Expression;

/**
 * Parent class of all unary expressions. Unary expressions have a single
 * expression.
 *
 * @author Ivan
 */
public abstract class Unary extends Expression {
    private final Expression expression;

    protected Unary(Expression expression, LineInfo lineInfo) {
        super(lineInfo);
        this.expression = expression;
    }

    public Expression getExpression() {
        return expression;
    }

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

        Unary unary = (Unary) o;

        if (!expression.equals(unary.expression)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return expression.hashCode();
    }
}