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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.pipelineprocessor.ast.expressions;

import org.antlr.v4.runtime.Token;
import org.graylog.plugins.pipelineprocessor.parser.ParseException;
import org.graylog.plugins.pipelineprocessor.parser.errors.SyntaxError;

import java.util.Collections;

public abstract class UnaryExpression extends BaseExpression {

    protected Expression right;

    public UnaryExpression(Token start, Expression right) {
        super(start);
        this.right = requireNonNull(right, start);
    }

    private static Expression requireNonNull(Expression expression, Token token) {
        if (expression != null) {
            return expression;
        } else {
            final int line = token.getLine();
            final int positionInLine = token.getCharPositionInLine();
            final String msg = "Invalid expression (line: " + line + ", column: " + positionInLine + ")";
            final SyntaxError syntaxError = new SyntaxError(token.getText(), line, positionInLine, msg, null);
            throw new ParseException(Collections.singleton(syntaxError));
        }
    }

    @Override
    public boolean isConstant() {
        return right.isConstant();
    }

    @Override
    public Class getType() {
        return right.getType();
    }

    public Expression right() {
        return right;
    }

    public void right(Expression right) {
        this.right = right;
    }

    @Override
    public Iterable children() {
        return Collections.singleton(right);
    }
}