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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

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

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

import java.util.Objects;

/**
 * A node for a conditional not expression:
 *
 *  *   ! expression
 * 
 */
public class ConditionalNotNode extends UnaryOperationNode {

    /**
     * Create a new ConditionalNotNode.
     *
     * @param tree the logical-complement tree for this node
     * @param operand the boolean expression being negated
     */
    public ConditionalNotNode(UnaryTree tree, Node operand) {
        super(tree, operand);
        assert tree.getKind() == Tree.Kind.LOGICAL_COMPLEMENT;
    }

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

    @Override
    public String toString() {
        return "(!" + getOperand() + ")";
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (!(obj instanceof ConditionalNotNode)) {
            return false;
        }
        ConditionalNotNode other = (ConditionalNotNode) obj;
        return getOperand().equals(other.getOperand());
    }

    @Override
    public int hashCode() {
        return Objects.hash(ConditionalNotNode.class, getOperand());
    }
}