io.mindmaps.graql.internal.validation.DeleteVarValidator Maven / Gradle / Ivy

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/*
 * MindmapsDB - A Distributed Semantic Database
 * Copyright (C) 2016  Mindmaps Research Ltd
 *
 * MindmapsDB 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.
 *
 * MindmapsDB 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 MindmapsDB. If not, see .
 */

package io.mindmaps.graql.internal.validation;

import io.mindmaps.MindmapsGraph;
import io.mindmaps.util.ErrorMessage;
import io.mindmaps.graql.admin.VarAdmin;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;

/**
 * A validator that validates a deleter Var in a delete query
 */
class DeleteVarValidator implements Validator {

    private final VarAdmin var;

    /**
     * @param var a deleter Var in a delete query
     */
    DeleteVarValidator(VarAdmin var) {
        this.var = var;
    }

    @Override
    public Stream getErrors(MindmapsGraph graph) {
        List errors = new ArrayList<>();

        if (var.hasValue()) errors.add(ErrorMessage.DELETE_VALUE.getMessage());

        return errors.stream();
    }
}