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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 java.util.List;

import javax.lang.model.element.VariableElement;

import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.framework.flow.CFAbstractAnalysis;
import org.checkerframework.framework.type.AnnotatedTypeMirror;
import org.checkerframework.framework.util.AnnotatedTypes;
import org.checkerframework.javacutil.Pair;

/**
 * The analysis class for the non-null type system (serves as factory for the
 * transfer function, stores and abstract values.
 *
 * @author Stefan Heule
 */
public class NullnessAnalysis extends
        CFAbstractAnalysis {

    public NullnessAnalysis(BaseTypeChecker checker,
            NullnessAnnotatedTypeFactory factory,
            List> fieldValues) {
        super(checker, factory, fieldValues);
    }

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

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

    @Override
    public NullnessValue createAbstractValue(AnnotatedTypeMirror type) {
        if (!AnnotatedTypes.isValidType(qualifierHierarchy, type)) {
            // If the type is not valid, we return null, which is the same as
            // 'no information'.
            return null;
        }
        return new NullnessValue(this, type);
    }
}