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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.checker.regex;


import org.checkerframework.checker.experimental.regex_qual.Regex;
import org.checkerframework.common.basetype.BaseTypeVisitor;
import org.checkerframework.framework.qual.TypeUseLocation;
import org.checkerframework.framework.util.defaults.QualifierDefaults;
import org.checkerframework.qualframework.base.CheckerAdapter;
import org.checkerframework.qualframework.poly.PolyQual.GroundQual;
import org.checkerframework.qualframework.poly.QualParams;
import org.checkerframework.framework.qual.StubFiles;

/**
 * {@link CheckerAdapter} for the Regex-Qual-Param type system.
 */
@StubFiles("apache-xerces.astub")
public class RegexChecker extends CheckerAdapter> {

    public RegexChecker() {
        super(new RegexQualPolyChecker());
    }

    @Override
    protected BaseTypeVisitor createSourceVisitor() {
        return new RegexTypecheckVisitor(this);
    }

    @Override
    public void setupDefaults(QualifierDefaults defaults) {
        defaults.addCheckedCodeDefault(
                getTypeMirrorConverter().getAnnotation(
                        new QualParams<>(new GroundQual<>(Regex.BOTTOM))),
                TypeUseLocation.LOWER_BOUND);

        defaults.addCheckedCodeDefault(
                getTypeMirrorConverter().getAnnotation(
                        new QualParams<>(new GroundQual<>(Regex.TOP))),
                TypeUseLocation.LOCAL_VARIABLE);
    }

}