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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.builder;

import org.checkerframework.dataflow.cfg.builder.ExtendedNode.ExtendedNodeType;
import org.checkerframework.dataflow.cfg.node.Node;

/** An extended node of type {@code NODE}. */
/*package-private*/ class NodeHolder extends ExtendedNode {

    /** The node to hold. */
    protected final Node node;

    /**
     * Construct a NodeHolder for the given Node.
     *
     * @param node the node to hold
     */
    public NodeHolder(Node node) {
        super(ExtendedNodeType.NODE);
        this.node = node;
    }

    @Override
    public Node getNode() {
        return node;
    }

    @Override
    public String toString() {
        return "NodeHolder(" + node + ")";
    }

    @Override
    public String toStringDebug() {
        return "NodeHolder(" + node.toStringDebug() + ")";
    }
}