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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.ClassTree;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.javacutil.TreeUtils;

import java.util.Collection;
import java.util.Collections;
import java.util.Objects;

/**
 * A node representing a class declaration that occurs within a method, for example, an anonymous
 * class declaration. In contrast to a top-level class declaration, such a declaration has an
 * initialization store that contains captured variables.
 */
public class ClassDeclarationNode extends Node {

    protected final ClassTree tree;

    public ClassDeclarationNode(ClassTree tree) {
        super(TreeUtils.typeOf(tree));
        this.tree = tree;
    }

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

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

    @Override
    public String toString() {
        return tree.toString();
    }

    @Override
    public boolean equals(@Nullable Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        ClassDeclarationNode that = (ClassDeclarationNode) o;
        return Objects.equals(tree, that.tree);
    }

    @Override
    public int hashCode() {
        return Objects.hash(tree);
    }

    @Override
    @SideEffectFree
    public Collection getOperands() {
        return Collections.emptyList();
    }
}




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