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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 java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import javax.lang.model.type.TypeMirror;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.javacutil.TypesUtils;

/**
 * A node for the narrowing primitive conversion operation. See JLS 5.1.3 for the definition of
 * narrowing primitive conversion.
 *
 * A {@link NarrowingConversionNode} 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 NarrowingConversionNode extends Node {

    protected final Tree tree;
    protected final Node operand;

    public NarrowingConversionNode(Tree tree, Node operand, TypeMirror type) {
        super(type);
        assert TypesUtils.isPrimitive(type) : "non-primitive type in narrowing 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.visitNarrowingConversion(this, p);
    }

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

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

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

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