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

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

/**
 * A node for a boolean literal:
 *
 *  *   true
 *   false
 * 
 *
 * @author Stefan Heule
 *
 */
public class BooleanLiteralNode extends ValueLiteralNode {

    public BooleanLiteralNode(LiteralTree t) {
        super(t);
        assert t.getKind().equals(Tree.Kind.BOOLEAN_LITERAL);
    }

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

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

    @Override
    public boolean equals(Object obj) {
        // test that obj is a BooleanLiteralNode
        if (!(obj instanceof BooleanLiteralNode)) {
            return false;
        }
        // super method compares values
        return super.equals(obj);
    }

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