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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.PrimitiveTypeTree;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import javax.lang.model.util.Types;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.javacutil.TreeUtils;

/**
 * A node representing a primitive type used in an expression such as a field access.
 *
 * type .class
 */
public class PrimitiveTypeNode extends Node {

  protected final PrimitiveTypeTree tree;

  /** For Types.isSameType. */
  protected final Types types;

  public PrimitiveTypeNode(PrimitiveTypeTree tree, Types types) {
    super(TreeUtils.typeOf(tree));
    this.tree = tree;
    this.types = types;
  }

  @Override
  public PrimitiveTypeTree getTree() {
    return tree;
  }

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

  @Override
  public String toString() {
    return tree.toString();
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (!(obj instanceof PrimitiveTypeNode)) {
      return false;
    }
    PrimitiveTypeNode other = (PrimitiveTypeNode) obj;
    return types.isSameType(getType(), other.getType());
  }

  @Override
  public int hashCode() {
    return Objects.hash(getType());
  }

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