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dataflow-shaded is a dataflow framework based on the javac compiler. It differs from the org.checkerframework:dataflow artifact in two ways. First, the packages in this artifact have been renamed to org.checkerframework.shaded.*. Second, unlike the dataflow artifact, this artifact contains the dependencies it requires.

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package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.Tree;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;

import java.util.Collection;
import java.util.Collections;

/**
 * A node for the null literal.
 *
 *  *   null
 * 
 */
public class NullLiteralNode extends ValueLiteralNode {

    /**
     * Create a new NullLiteralNode.
     *
     * @param t the tree for the literal value
     */
    public NullLiteralNode(LiteralTree t) {
        super(t);
        assert t.getKind() == Tree.Kind.NULL_LITERAL;
    }

    @Override
    public Void getValue() {
        return (Void) tree.getValue();
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitNullLiteral(this, p);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof NullLiteralNode)) {
            return false;
        }
        // super method compares values
        return super.equals(obj);
    }

    @Override
    @SideEffectFree
    public Collection getOperands() {
        return Collections.emptyList();
    }
}