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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.nullness;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.framework.flow.CFAbstractAnalysis;
import org.checkerframework.framework.flow.CFAbstractValue;
import org.checkerframework.javacutil.AnnotationMirrorSet;

import javax.lang.model.type.TypeMirror;

/**
 * The analysis class for the non-null type system (serves as factory for the transfer function,
 * stores and abstract values.
 */
public class NullnessNoInitAnalysis
        extends CFAbstractAnalysis<
                NullnessNoInitValue, NullnessNoInitStore, NullnessNoInitTransfer> {

    /**
     * Creates a new {@code NullnessAnalysis}.
     *
     * @param checker the checker
     * @param factory the factory
     */
    public NullnessNoInitAnalysis(
            BaseTypeChecker checker, NullnessNoInitAnnotatedTypeFactory factory) {
        super(checker, factory);
    }

    @Override
    public NullnessNoInitStore createEmptyStore(boolean sequentialSemantics) {
        return new NullnessNoInitStore(this, sequentialSemantics);
    }

    @Override
    public NullnessNoInitStore createCopiedStore(NullnessNoInitStore s) {
        return new NullnessNoInitStore(s);
    }

    @Override
    public @Nullable NullnessNoInitValue createAbstractValue(
            AnnotationMirrorSet annotations, TypeMirror underlyingType) {
        if (!CFAbstractValue.validateSet(annotations, underlyingType, atypeFactory)) {
            return null;
        }
        return new NullnessNoInitValue(this, annotations, underlyingType);
    }
}