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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.ParameterizedTypeTree;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.javacutil.TreeUtils;

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

/**
 * A node for a parameterized type occurring in an expression:
 *
 *  *   type<arg1, arg2>
 * 
 *
 * Parameterized types don't represent any computation to be done at runtime, so we might choose to
 * represent them differently by modifying the {@link Node}s in which parameterized types can occur,
 * such as {@link ObjectCreationNode}s.
 */
public class ParameterizedTypeNode extends Node {

    protected final ParameterizedTypeTree tree;

    public ParameterizedTypeNode(ParameterizedTypeTree t) {
        super(TreeUtils.typeOf(t));
        tree = t;
    }

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

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

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

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

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

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