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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.qualframework.base;

import org.checkerframework.qualframework.base.QualifiedTypeMirror;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedArrayType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedDeclaredType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedExecutableType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedIntersectionType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedNoType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedNullType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedPrimitiveType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedTypeVariable;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedUnionType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedWildcardType;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedTypeDeclaration;
import org.checkerframework.qualframework.base.QualifiedTypeMirror.QualifiedParameterDeclaration;

/**
 * A simple implementation of {@link QualifiedTypeVisitor}, patterned after
 * {@link javax.lang.model.util.SimpleTypeVisitor8}.
 */
public class SimpleQualifiedTypeVisitor implements QualifiedTypeVisitor {
    protected final R DEFAULT_VALUE;

    public SimpleQualifiedTypeVisitor() {
        this(null);
    }

    public SimpleQualifiedTypeVisitor(R defaultValue) {
        this.DEFAULT_VALUE = defaultValue;
    }

    protected R defaultAction(QualifiedTypeMirror type, P p) {
        return DEFAULT_VALUE;
    }

    @Override
    public R visit(QualifiedTypeMirror type) {
        return visit(type, null);
    }

    @Override
    public R visit(QualifiedTypeMirror type, P p) {
        return (type == null) ? null : type.accept(this, p);
    }

    @Override
    public R visitDeclared(QualifiedDeclaredType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitIntersection(QualifiedIntersectionType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitUnion(QualifiedUnionType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitExecutable(QualifiedExecutableType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitArray(QualifiedArrayType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitTypeVariable(QualifiedTypeVariable type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitPrimitive(QualifiedPrimitiveType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitNoType(QualifiedNoType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitNull(QualifiedNullType type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitWildcard(QualifiedWildcardType type, P p) {
        return defaultAction(type, p);
    }


    @Override
    public R visitTypeDeclaration(QualifiedTypeDeclaration type, P p) {
        return defaultAction(type, p);
    }

    @Override
    public R visitParameterDeclaration(QualifiedParameterDeclaration type, P p) {
        return defaultAction(type, p);
    }
}