FutureDateValidator.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package ddf.catalog.validation.impl.validator;

import java.time.Instant;
import java.util.Date;
import java.util.Optional;

import com.google.common.base.Preconditions;

import ddf.catalog.data.Attribute;
import ddf.catalog.validation.AttributeValidator;
import ddf.catalog.validation.report.AttributeValidationReport;

/**
 * Validates an attribute's value(s) against the current date and time, validating that they are
 * in the future.
 * <p>
 * Is capable of validating {@link Date}s.
 */
public class FutureDateValidator extends AbstractDateValidator implements AttributeValidator {
    private static final FutureDateValidator INSTANCE = new FutureDateValidator();

    private FutureDateValidator() {
    }

    public static FutureDateValidator getInstance() {
        return INSTANCE;
    }

    /**
     * {@inheritDoc}
     * <p>
     * Validates only the values of {@code attribute} that are {@link Date}s.
     */
    @Override
    public Optional<AttributeValidationReport> validate(final Attribute attribute) {
        Preconditions.checkArgument(attribute != null, "The attribute cannot be null.");

        final Date now = Date.from(Instant.now());
        return validate(attribute, (date) -> date.after(now), "must be in the future");
    }
}