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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 visitor for {@link QualifiedTypeMirror}s, patterned after {@link
 * javax.lang.model.type.TypeVisitor}.
 */
public interface QualifiedTypeVisitor {
    R visit(QualifiedTypeMirror type);
    R visit(QualifiedTypeMirror type, P p);
    R visitDeclared(QualifiedDeclaredType type, P p);
    R visitIntersection(QualifiedIntersectionType type, P p);
    R visitUnion(QualifiedUnionType type, P p);
    R visitExecutable(QualifiedExecutableType type, P p);
    R visitArray(QualifiedArrayType type, P p);
    R visitTypeVariable(QualifiedTypeVariable type, P p);
    R visitPrimitive(QualifiedPrimitiveType type, P p);
    R visitNoType(QualifiedNoType type, P p);
    R visitNull(QualifiedNullType type, P p);
    R visitWildcard(QualifiedWildcardType type, P p);

    R visitTypeDeclaration(QualifiedTypeDeclaration type, P p);
    R visitParameterDeclaration(QualifiedParameterDeclaration type, P p);
}