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An easy-to-learn/use static analysis framework for Java

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/*
 * Tai-e: A Static Analysis Framework for Java
 *
 * Copyright (C) 2022 Tian Tan 
 * Copyright (C) 2022 Yue Li 
 *
 * This file is part of Tai-e.
 *
 * Tai-e 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.
 *
 * Tai-e 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 Tai-e. If not, see .
 */

package pascal.taie.analysis.bugfinder.nullpointer;

import pascal.taie.analysis.graph.cfg.CFGEdge;
import pascal.taie.ir.exp.Var;
import pascal.taie.ir.stmt.If;
import pascal.taie.language.type.ReferenceType;

import javax.annotation.CheckForNull;

class IsNullConditionDecision {

    private final If conditionStmt;

    private final Var varTested;

    private final IsNullValue ifTrueDecision;

    private final IsNullValue ifFalseDecision;

    public IsNullConditionDecision(
            If stmt, Var varTested,
            IsNullValue ifTrueDecision, IsNullValue ifFalseDecision) {
        assert varTested.getType() instanceof ReferenceType;
        assert !(ifTrueDecision == null && ifFalseDecision == null);
        this.conditionStmt = stmt;
        this.varTested = varTested;
        this.ifTrueDecision = ifTrueDecision;
        this.ifFalseDecision = ifFalseDecision;
    }

    public If getConditionStmt() {
        return conditionStmt;
    }

    public Var getVarTested() {
        return varTested;
    }

    public boolean isEdgeFeasible(CFGEdge.Kind edgeKind) {
        return getDecision(edgeKind) != null;
    }

    @CheckForNull
    public IsNullValue getDecision(CFGEdge.Kind edgeKind) {
        return switch (edgeKind) {
            case IF_TRUE -> ifTrueDecision;
            case IF_FALSE -> ifFalseDecision;
            default -> throw new UnsupportedOperationException("Incorrect edge kind: " + edgeKind);
        };
    }
}