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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.common.reflection;

import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.common.basetype.BaseTypeVisitor;
import org.checkerframework.common.value.ValueChecker;
import org.plumelib.util.CollectionsPlume;

import java.util.LinkedHashSet;
import java.util.Set;

/**
 * The MethodVal Checker provides a sound estimate of the signature of Method objects.
 *
 * @checker_framework.manual #methodval-and-classval-checkers MethodVal Checker
 */
public class MethodValChecker extends BaseTypeChecker {
    @Override
    protected BaseTypeVisitor createSourceVisitor() {
        return new MethodValVisitor(this);
    }

    @Override
    protected Set> getImmediateSubcheckerClasses() {
        // Don't call super otherwise MethodVal will be added as a subChecker
        // which creates a circular dependency.
        // Use the same Set implementation as super.
        Set> subCheckers =
                new LinkedHashSet<>(CollectionsPlume.mapCapacity(2));
        subCheckers.add(ValueChecker.class);
        subCheckers.add(ClassValChecker.class);
        return subCheckers;
    }
}