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

/**
 * A node for the unary plus operation:
 *
 *  *   + expression
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class NumericalPlusNode extends Node {

    protected Tree tree;
    protected Node operand;

    public NumericalPlusNode(Tree tree, Node operand) {
        super(InternalUtils.typeOf(tree));
        assert tree.getKind() == Kind.UNARY_PLUS;
        this.tree = tree;
        this.operand = operand;
    }

    public Node getOperand() {
        return operand;
    }

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

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

    @Override
    public String toString() {
        return "(+ " + getOperand() + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof NumericalPlusNode)) {
            return false;
        }
        NumericalPlusNode other = (NumericalPlusNode) obj;
        return getOperand().equals(other.getOperand());
    }

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

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