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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.framework.type;

import org.checkerframework.javacutil.ErrorReporter;

import com.sun.source.tree.Tree;
import com.sun.source.util.SimpleTreeVisitor;

/**
 * Converts a Tree into an AnnotatedTypeMirror.  This class is abstract and provides 2 important properties
 * to subclasses:
 *   1) It implements SimpleTreeVisitor with the appropriate type parameters
 *   2) It provides a defaultAction that causes all visit methods to abort if the subclass does not override them
 *
 * @see org.checkerframework.framework.type.TypeFromTree
 */
abstract class TypeFromTreeVisitor extends SimpleTreeVisitor {

    TypeFromTreeVisitor() {}

    @Override
    public AnnotatedTypeMirror defaultAction(Tree node, AnnotatedTypeFactory f) {
        if (node == null) {
            ErrorReporter.errorAbort("TypeFromTree.defaultAction: null tree");
            return null; // dead code
        }
        ErrorReporter.errorAbort(
            "TypeFromTree.defaultAction: conversion undefined for tree type " + node.getKind() + "\n"
        );
        return null; // dead code
    }

}