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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.util;

import org.checkerframework.javacutil.TypesUtils;

import org.checkerframework.dataflow.cfg.node.ConditionalOrNode;
import org.checkerframework.dataflow.cfg.node.Node;

import com.sun.source.tree.Tree;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.tree.JCTree;

/**
 * A utility class to operate on a given {@link Node}.
 *
 * @author Stefan Heule
 *
 */
public class NodeUtils {

    /**
     * @return true iff node corresponds to a boolean typed
     *         expression (either the primitive type boolean, or
     *         class type {@link java.lang.Boolean})
     */
    public static boolean isBooleanTypeNode(Node node) {

        if (node instanceof ConditionalOrNode) {
            return true;
        }

        // not all nodes have an associated tree, but those are all not of a
        // boolean type.
        Tree tree = node.getTree();
        if (tree == null) {
            return false;
        }

        Type type = ((JCTree) tree).type;
        if (TypesUtils.isBooleanType(type)) {
            return true;
        }

        return false;
    }
}