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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 java.util.Collection;
import java.util.Collections;
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);
  }

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