Validator.java

/**
 * Copyright © 2016-2017 The Thingsboard Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.thingsboard.server.dao.service;

import org.thingsboard.server.common.data.id.UUIDBased;
import org.thingsboard.server.common.data.page.TextPageLink;
import org.thingsboard.server.dao.exception.IncorrectParameterException;

import java.util.List;
import java.util.UUID;

public class Validator {

    /**
     * This method validate <code>String</code> string. If string is invalid than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param val          the val
     * @param errorMessage the error message for exception
     */
    public static void validateString(String val, String errorMessage) {
        if (val == null || val.isEmpty()) {
            throw new IncorrectParameterException(errorMessage);
        }
    }


    /**
     * This method validate <code>String</code> string. If string is invalid than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param val          the val
     * @param errorMessage the error message for exception
     */
    public static void validatePositiveNumber(long val, String errorMessage) {
        if (val <= 0) {
            throw new IncorrectParameterException(errorMessage);
        }
    }

    /**
     * This method validate <code>UUID</code> id. If id is null than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param id           the id
     * @param errorMessage the error message for exception
     */
    public static void validateId(UUID id, String errorMessage) {
        if (id == null) {
            throw new IncorrectParameterException(errorMessage);
        }
    }


    /**
     * This method validate <code>UUIDBased</code> id. If id is null than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param id           the id
     * @param errorMessage the error message for exception
     */
    public static void validateId(UUIDBased id, String errorMessage) {
        if (id == null || id.getId() == null) {
            throw new IncorrectParameterException(errorMessage);
        }
    }

    /**
     * This method validate list of <code>UUIDBased</code> ids. If at least one of the ids is null than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param ids          the list of ids
     * @param errorMessage the error message for exception
     */
    public static void validateIds(List<? extends UUIDBased> ids, String errorMessage) {
        if (ids == null || ids.isEmpty()) {
            throw new IncorrectParameterException(errorMessage);
        } else {
            for (UUIDBased id : ids) {
                validateId(id, errorMessage);
            }
        }
    }

    /**
     * This method validate <code>PageLink</code> page link. If pageLink is invalid than throw
     * <code>IncorrectParameterException</code> exception
     *
     * @param pageLink     the page link
     * @param errorMessage the error message for exception
     */
    public static void validatePageLink(TextPageLink pageLink, String errorMessage) {
        if (pageLink == null) {
            throw new IncorrectParameterException(errorMessage);
        } else if (pageLink.getLimit() < 1) {
            throw new IncorrectParameterException(errorMessage);
        } else if (pageLink.getIdOffset() != null && pageLink.getIdOffset().version() != 1) {
            throw new IncorrectParameterException(errorMessage);
        }
    }

}