Java tutorial
/* * 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)); } } }