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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 com.sun.source.tree.IdentifierTree;

import org.checkerframework.javacutil.TreeUtils;

/**
 * A node for a reference to 'this'.
 *
 *  *   this
 * 
 */
public class ExplicitThisNode extends ThisNode {

    protected final IdentifierTree tree;

    public ExplicitThisNode(IdentifierTree t) {
        super(TreeUtils.typeOf(t));
        assert t.getName().contentEquals("this");
        tree = t;
    }

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

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

    @Override
    public String toString() {
        return "this";
    }
}