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

import org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;

import com.sun.source.tree.PrimitiveTypeTree;
import com.sun.source.tree.Tree;

/**
 * A node representing a primitive type used in an expression
 * such as a field access
 *
 * type .class
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class PrimitiveTypeNode extends Node {

    protected final PrimitiveTypeTree tree;

    public PrimitiveTypeNode(PrimitiveTypeTree tree) {
        super(InternalUtils.typeOf(tree));
        this.tree = tree;
    }

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

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

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

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof PrimitiveTypeNode)) {
            return false;
        }
        PrimitiveTypeNode other = (PrimitiveTypeNode) obj;
        return getType().equals(other.getType());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getType());
    }

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