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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 org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;

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

/**
 * 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.
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */

public class ParameterizedTypeNode extends Node {

    protected Tree tree;

    public ParameterizedTypeNode(Tree t) {
        super(InternalUtils.typeOf(t));
        assert t instanceof ParameterizedTypeTree;
        tree = t;
    }

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

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

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