org.sonar.plsqlopen.checks.ComparisonWithNullCheck.kt Maven / Gradle / Ivy

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Z PL/SQL Analyzer :: Checks

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/**
 * Z PL/SQL Analyzer
 * Copyright (C) 2015-2024 Felipe Zorzo
 * mailto:felipe AT felipezorzo DOT com DOT br
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.plsqlopen.checks

import com.felipebz.flr.api.AstNode
import org.sonar.plsqlopen.typeIs
import org.sonar.plugins.plsqlopen.api.ConditionsGrammar
import org.sonar.plugins.plsqlopen.api.PlSqlGrammar
import org.sonar.plugins.plsqlopen.api.annotations.*

@Rule(priority = Priority.BLOCKER, tags = [Tags.BUG])
@ConstantRemediation("5min")
@RuleInfo(scope = RuleInfo.Scope.ALL)
@ActivatedByDefault
class ComparisonWithNullCheck : AbstractBaseCheck() {

    override fun init() {
        subscribeTo(PlSqlGrammar.COMPARISON_EXPRESSION)
    }

    override fun visitNode(node: AstNode) {
        val children = node.getChildren(PlSqlGrammar.LITERAL)
        for (child in children) {
            if (CheckUtils.isNullLiteralOrEmptyString(child)) {
                val operator = node.getFirstChild(ConditionsGrammar.RELATIONAL_OPERATOR)
                val suggestion = if (operator.firstChild.typeIs(PlSqlGrammar.EQUALS_OPERATOR)) {
                    "IS NULL"
                } else {
                    "IS NOT NULL"
                }

                addIssue(node, getLocalizedMessage(), suggestion)
            }
        }
    }

}