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

/**
 * A node for a conditional or expression:
 *
 *  *   expression || expression
 * 
 *
 * @author Stefan Heule
 *
 */
public class ConditionalOrNode extends Node {

    protected BinaryTree tree;
    protected Node lhs;
    protected Node rhs;

    public ConditionalOrNode(BinaryTree tree, Node lhs, Node rhs) {
        super(InternalUtils.typeOf(tree));
        assert tree.getKind().equals(Kind.CONDITIONAL_OR);
        this.tree = tree;
        this.lhs = lhs;
        this.rhs = rhs;
    }

    public Node getLeftOperand() {
        return lhs;
    }

    public Node getRightOperand() {
        return rhs;
    }

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

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

    @Override
    public String toString() {
        return "(" + getLeftOperand() + " || " + getRightOperand() + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof ConditionalOrNode)) {
            return false;
        }
        ConditionalOrNode other = (ConditionalOrNode) obj;
        return getLeftOperand().equals(other.getLeftOperand())
                && getRightOperand().equals(other.getRightOperand());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getLeftOperand(), getRightOperand());
    }

    @Override
    public Collection getOperands() {
        LinkedList list = new LinkedList();
        list.add(getLeftOperand());
        list.add(getRightOperand());
        return list;
    }
}