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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.Tree;

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

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

import javax.lang.model.type.TypeMirror;

/**
 * A node for the widening primitive conversion operation. See JLS 5.1.2 for the definition of
 * widening primitive conversion.
 *
 * A {@link WideningConversionNode} does not correspond to any tree node in the parsed AST. It is
 * introduced when a value of some primitive type appears in a context that requires a different
 * primitive with more bits of precision.
 */
public class WideningConversionNode extends Node {

    protected final Tree tree;
    protected final Node operand;

    public WideningConversionNode(Tree tree, Node operand, TypeMirror type) {
        super(type);
        assert TypesUtils.isPrimitive(type) : "non-primitive type in widening conversion";
        this.tree = tree;
        this.operand = operand;
    }

    public Node getOperand() {
        return operand;
    }

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

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

    @Override
    public String toString() {
        return "WideningConversion(" + getOperand() + ", " + type + ")";
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (!(obj instanceof WideningConversionNode)) {
            return false;
        }
        WideningConversionNode other = (WideningConversionNode) obj;
        return getOperand().equals(other.getOperand())
                && TypesUtils.areSamePrimitiveTypes(getType(), other.getType());
    }

    @Override
    public int hashCode() {
        return Objects.hash(WideningConversionNode.class, getOperand());
    }

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