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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.LinkedList;

import org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;

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

/**
 * A node for a conditional expression:
 *
 *  *   expression ? expression : expression
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class TernaryExpressionNode extends Node {

    protected ConditionalExpressionTree tree;
    protected Node condition;
    protected Node thenOperand;
    protected Node elseOperand;

    public TernaryExpressionNode(ConditionalExpressionTree tree, Node condition,
            Node thenOperand, Node elseOperand) {
        super(InternalUtils.typeOf(tree));
        assert tree.getKind().equals(Kind.CONDITIONAL_EXPRESSION);
        this.tree = tree;
        this.condition = condition;
        this.thenOperand = thenOperand;
        this.elseOperand = elseOperand;
    }

    public Node getConditionOperand() {
        return condition;
    }

    public Node getThenOperand() {
        return thenOperand;
    }

    public Node getElseOperand() {
        return elseOperand;
    }

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

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

    @Override
    public String toString() {
        return "(" + getConditionOperand() + " ? " + getThenOperand() + " : "
                + getElseOperand() + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof TernaryExpressionNode)) {
            return false;
        }
        TernaryExpressionNode other = (TernaryExpressionNode) obj;
        return getConditionOperand().equals(other.getConditionOperand())
                && getThenOperand().equals(other.getThenOperand())
                && getElseOperand().equals(other.getElseOperand());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getConditionOperand(), getThenOperand(),
                getElseOperand());
    }

    @Override
    public Collection getOperands() {
        LinkedList list = new LinkedList();
        list.add(getConditionOperand());
        list.add(getThenOperand());
        list.add(getElseOperand());
        return list;
    }
}