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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.dataflow.cfg.node.Node;
import org.checkerframework.dataflow.qual.Pure;

import java.util.Map;
import java.util.Set;

import javax.lang.model.type.TypeMirror;

/**
 * Represents a basic block that contains exactly one {@link Node} which can throw an exception.
 * This block has exactly one non-exceptional successor, and one or more exceptional successors.
 *
 * The following invariant holds.
 *
 * 
 * getNode().getBlock() == this
 * 
 */
public interface ExceptionBlock extends SingleSuccessorBlock {

    /**
     * Returns the node of this block.
     *
     * @return the node of this block
     */
    @Pure
    Node getNode();

    /**
     * Returns the list of exceptional successor blocks as an unmodifiable map.
     *
     * @return the list of exceptional successor blocks as an unmodifiable map
     */
    @Pure
    Map> getExceptionalSuccessors();
}