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

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

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

/**
 * A node for a short literal. For example:
 *
 *  *   5
 *   0x8fff
 * 
 *
 * Java source and the AST representation do not have "short" literals. They have integer literals
 * that may be narrowed to shorts depending on context.
 */
// TODO: If we use explicit NarrowingConversionNodes, do we need ShortLiteralNodes too?
public class ShortLiteralNode extends ValueLiteralNode {

    /**
     * Create a new ShortLiteralNode.
     *
     * @param t the tree for the literal value
     */
    public ShortLiteralNode(LiteralTree t) {
        super(t);
        assert t.getKind() == Tree.Kind.INT_LITERAL;
    }

    @Override
    public Short getValue() {
        return (Short) tree.getValue();
    }

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

    @Override
    public boolean equals(@Nullable Object obj) {
        // test that obj is a ShortLiteralNode
        if (!(obj instanceof ShortLiteralNode)) {
            return false;
        }
        // super method compares values
        return super.equals(obj);
    }

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