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

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

/**
 * A node for a long literal. For example:
 *
 *  *   -3l
 *   0x80808080L
 * 
 */
public class LongLiteralNode extends ValueLiteralNode {

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

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

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

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