AssertNonNullIfNonNullTest.java

import org.checkerframework.checker.nullness.qual.AssertNonNullIfNonNull;
import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.Pure;

// Re-enable when @AssertNonNullIfNonNull checking is enhanced
// @skip-test

public class AssertNonNullIfNonNullTest {

    private @Nullable String value;

    @Pure
    @AssertNonNullIfNonNull("value")
    public @Nullable String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    @EnsuresNonNullIf(expression = "value", result = true)
    public boolean isValueNonNull1() {
        return value != null;
    }

    @EnsuresNonNullIf(expression = "getValue()", result = true)
    public boolean isValueNonNull2() {
        // The @AssertNonNullIfNonNull annotation implies that if getValue() is
        // non-null, then is non-null, then value is non-null, but not the
        // converse, so an error should be issued here.
        //:: error: contracts.conditional.postcondition.not.satisfied
        return value != null;
    }

    // The @AssertNonNullIfNonNull annotation should enable suppressing this error.
    @EnsuresNonNullIf(expression = "value", result = true)
    public boolean isValueNonNull3() {
        return getValue() != null;
    }

    @EnsuresNonNullIf(expression = "getValue()", result = true)
    public boolean isValueNonNull4() {
        return getValue() != null;
    }
}