com.speedment.runtime.field.internal.predicate.string.StringIsNullPredicate Maven / Gradle / Ivy

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package com.speedment.runtime.field.internal.predicate.string;

import com.speedment.runtime.compute.trait.ToNullable;
import com.speedment.runtime.field.Field;
import com.speedment.runtime.field.StringField;
import com.speedment.runtime.field.predicate.FieldIsNotNullPredicate;
import com.speedment.runtime.field.predicate.FieldIsNullPredicate;

import static java.util.Objects.requireNonNull;

/**
 * @author Emil Forslund
 * @since  3.1.2
 */
public final class StringIsNullPredicate
implements FieldIsNullPredicate {

    private final StringField field;

    public StringIsNullPredicate(StringField field) {
        this.field = requireNonNull(field);
    }

    @Override
    public boolean test(ENTITY value) {
        return field.apply(value) == null;
    }

    @Override
    public FieldIsNotNullPredicate negate() {
        return new StringIsNotNullPredicate<>(field);
    }

    @Override
    public ToNullable expression() {
        return field;
    }

    @Override
    public Field getField() {
        return field;
    }
}