com.opopov.cloud.image.service.Validator.java Source code

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Here is the source code for com.opopov.cloud.image.service.Validator.java

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/*
 * MIT License
 *
 * Copyright (c) 2017 Oleg Popov <github@opopov.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.opopov.cloud.image.service;

import com.opopov.cloud.image.api.ImageStitchingConfiguration;
import com.opopov.cloud.image.exception.InvalidImageConfigException;
import org.springframework.stereotype.Component;

import javax.imageio.ImageIO;
import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by elx01 on 3/21/17.
 */
@Component
public class Validator {
    //contains allowed image formats
    Set<String> supportedImageWriteFormats = ConcurrentHashMap.newKeySet();

    public Validator() {
        supportedImageWriteFormats.addAll(Arrays.asList(ImageIO.getWriterFormatNames()));
    }

    public void validateConfig(ImageStitchingConfiguration config) throws InvalidImageConfigException {
        if (config.getUrlList().size() != config.getRowCount() * config.getColumnCount()) {
            throw new InvalidImageConfigException(
                    String.format("The list of the URLs must contain %d elements, but it contains %d elements",
                            config.getRowCount() * config.getColumnCount(), config.getUrlList().size()));
        }

        if (config.getOutputFormat() == null || !supportedImageWriteFormats.contains(config.getOutputFormat())) {
            throw new InvalidImageConfigException("The specified format " + config.getOutputFormat() + " is invalid"
                    + " please, specify one of the supported formats - "
                    + String.join(", ", supportedImageWriteFormats));
        }

    }
}