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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 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
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.eval;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.redhat.lightblue.metadata.FieldTreeNode;

import com.redhat.lightblue.query.UnaryLogicalExpression;
import com.redhat.lightblue.query.UnaryLogicalOperator;

public class UnaryLogicalExpressionEvaluator extends QueryEvaluator {

    private static final Logger LOGGER = LoggerFactory.getLogger(UnaryLogicalExpressionEvaluator.class);

    private final QueryEvaluator evaluator;
    private final UnaryLogicalOperator operator;

    public UnaryLogicalExpressionEvaluator(UnaryLogicalExpression expr,
                                           FieldTreeNode context) {
        evaluator = QueryEvaluator.getInstance(expr.getQuery(), context);
        operator = expr.getOp();
    }

    @Override
    public boolean evaluate(QueryEvaluationContext ctx) {
        LOGGER.debug("evaluate {}", operator);
        ctx.setResult(operator.apply(evaluator.evaluate(ctx)));
        return ctx.getResult();
    }
}