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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.block;

/*>>>
import org.checkerframework.checker.nullness.qual.Nullable;
*/

import org.checkerframework.dataflow.analysis.Store;

/**
 * A basic block that has at exactly one non-exceptional successor.
 *
 * @author Stefan Heule
 *
 */
public interface SingleSuccessorBlock extends Block {

    /**
     * @return the non-exceptional successor block, or {@code null} if there is
     *         no successor.
     */
    /*@Nullable*/ Block getSuccessor();

    /**
     * @return the flow rule for information flowing from this block to its successor
     */
    Store.FlowRule getFlowRule();

    /**
     * Set the flow rule for information flowing from this block to its successor.
     */
    void setFlowRule(Store.FlowRule rule);
}