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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 javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;

import org.checkerframework.dataflow.util.HashCodeUtils;

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

/**
 * A node for a case in a switch statement.  Although
 * a case has no abstract value, it can imply facts about
 * the abstract values of its operands.
 *
 *  *   case constant:
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class CaseNode extends Node {

    protected CaseTree tree;
    protected Node switchExpr;
    protected Node caseExpr;

    public CaseNode(CaseTree tree, Node switchExpr, Node caseExpr, Types types) {
        super(types.getNoType(TypeKind.NONE));
        assert tree.getKind().equals(Kind.CASE);
        this.tree = tree;
        this.switchExpr = switchExpr;
        this.caseExpr = caseExpr;
    }

    public Node getSwitchOperand() {
        return switchExpr;
    }

    public Node getCaseOperand() {
        return caseExpr;
    }

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

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

    @Override
    public String toString() {
        return "case " + getCaseOperand() + ":";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof CaseNode)) {
            return false;
        }
        CaseNode other = (CaseNode) obj;
        return getSwitchOperand().equals(other.getSwitchOperand())
                && getCaseOperand().equals(other.getCaseOperand());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getSwitchOperand(), getCaseOperand());
    }

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