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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;

/**
 * A visitor for a {@link Node} tree.
 *
 * @author Stefan Heule
 *
 * @param 
 *            Return type of the visitor. Use {@link Void} if the visitor does
 *            not have a return value.
 * @param 
 *            Parameter type of the visitor. Use {@link Void} if the visitor
 *            does not have a parameter.
 */
public interface NodeVisitor {
    // Literals
    R visitShortLiteral(ShortLiteralNode n, P p);

    R visitIntegerLiteral(IntegerLiteralNode n, P p);

    R visitLongLiteral(LongLiteralNode n, P p);

    R visitFloatLiteral(FloatLiteralNode n, P p);

    R visitDoubleLiteral(DoubleLiteralNode n, P p);

    R visitBooleanLiteral(BooleanLiteralNode n, P p);

    R visitCharacterLiteral(CharacterLiteralNode n, P p);

    R visitStringLiteral(StringLiteralNode n, P p);

    R visitNullLiteral(NullLiteralNode n, P p);

    // Unary operations
    R visitNumericalMinus(NumericalMinusNode n, P p);

    R visitNumericalPlus(NumericalPlusNode n, P p);

    R visitBitwiseComplement(BitwiseComplementNode n, P p);

    R visitNullChk(NullChkNode n, P p);

    // Binary operations
    R visitStringConcatenate(StringConcatenateNode n, P p);

    R visitNumericalAddition(NumericalAdditionNode n, P p);

    R visitNumericalSubtraction(NumericalSubtractionNode n, P p);

    R visitNumericalMultiplication(NumericalMultiplicationNode n, P p);

    R visitIntegerDivision(IntegerDivisionNode n, P p);

    R visitFloatingDivision(FloatingDivisionNode n, P p);

    R visitIntegerRemainder(IntegerRemainderNode n, P p);

    R visitFloatingRemainder(FloatingRemainderNode n, P p);

    R visitLeftShift(LeftShiftNode n, P p);

    R visitSignedRightShift(SignedRightShiftNode n, P p);

    R visitUnsignedRightShift(UnsignedRightShiftNode n, P p);

    R visitBitwiseAnd(BitwiseAndNode n, P p);

    R visitBitwiseOr(BitwiseOrNode n, P p);

    R visitBitwiseXor(BitwiseXorNode n, P p);

    // Compound assignments
    R visitStringConcatenateAssignment(StringConcatenateAssignmentNode n, P p);

    // Comparison operations
    R visitLessThan(LessThanNode n, P p);

    R visitLessThanOrEqual(LessThanOrEqualNode n, P p);

    R visitGreaterThan(GreaterThanNode n, P p);

    R visitGreaterThanOrEqual(GreaterThanOrEqualNode n, P p);

    R visitEqualTo(EqualToNode n, P p);

    R visitNotEqual(NotEqualNode n, P p);

    // Conditional operations
    R visitConditionalAnd(ConditionalAndNode n, P p);

    R visitConditionalOr(ConditionalOrNode n, P p);

    R visitConditionalNot(ConditionalNotNode n, P p);

    R visitTernaryExpression(TernaryExpressionNode n, P p);

    R visitAssignment(AssignmentNode n, P p);

    R visitLocalVariable(LocalVariableNode n, P p);

    R visitVariableDeclaration(VariableDeclarationNode n, P p);

    R visitFieldAccess(FieldAccessNode n, P p);

    R visitMethodAccess(MethodAccessNode n, P p);

    R visitArrayAccess(ArrayAccessNode n, P p);

    R visitImplicitThisLiteral(ImplicitThisLiteralNode n, P p);

    R visitExplicitThisLiteral(ExplicitThisLiteralNode n, P p);

    R visitSuper(SuperNode n, P p);

    R visitReturn(ReturnNode n, P p);

    R visitStringConversion(StringConversionNode n, P p);

    R visitNarrowingConversion(NarrowingConversionNode n, P p);

    R visitWideningConversion(WideningConversionNode n, P p);

    R visitInstanceOf(InstanceOfNode n, P p);

    R visitTypeCast(TypeCastNode n, P p);

    // Blocks

    R visitSynchronized(SynchronizedNode n, P p);

    // Statements
    R visitAssertionError(AssertionErrorNode n, P p);

    R visitThrow(ThrowNode n, P p);

    // Cases
    R visitCase(CaseNode n, P p);

    // Method and constructor invocations
    R visitMethodInvocation(MethodInvocationNode n, P p);

    R visitObjectCreation(ObjectCreationNode n, P p);

    R visitMemberReference(FunctionalInterfaceNode n, P p);

    R visitArrayCreation(ArrayCreationNode n, P p);

    // Type, package and class names
    R visitArrayType(ArrayTypeNode n, P p);

    R visitPrimitiveType(PrimitiveTypeNode n, P p);

    R visitClassName(ClassNameNode n, P p);

    R visitPackageName(PackageNameNode n, P p);

    // Parameterized types
    R visitParameterizedType(ParameterizedTypeNode n, P p);

    // Marker nodes
    R visitMarker(MarkerNode n, P p);
}