c3c90e2bd4
* created sonar config #1663 * updated license headers * xvfb to run tests * updated circle image to enable css and JS analysis
63 lines
2.9 KiB
Java
63 lines
2.9 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2021 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.parameter.object;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* The syntax of Java language doesn’t allow you to declare a method with a predefined value
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* for a parameter. Probably the best option to achieve default method parameters in Java is
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* by using the method overloading. Method overloading allows you to declare several methods
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* with the same name but with a different number of parameters. But the main problem with
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* method overloading as a solution for default parameter values reveals itself when a method
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* accepts multiple parameters. Creating an overloaded method for each possible combination of
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* parameters might be cumbersome. To deal with this issue, the Parameter Object pattern is used.
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* The Parameter Object is simply a wrapper object for all parameters of a method.
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* It is nothing more than just a regular POJO. The advantage of the Parameter Object over a
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* regular method parameter list is the fact that class fields can have default values.
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* Once the wrapper class is created for the method parameter list, a corresponding builder class
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* is also created. Usually it's an inner static class. The final step is to use the builder
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* to construct a new parameter object. For those parameters that are skipped,
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* their default values are going to be used.
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*/
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public class App {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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/**
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* Program entry point.
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*
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* @param args command line args
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*/
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public static void main(String[] args) {
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ParameterObject params = ParameterObject.newBuilder()
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.withType("sneakers")
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.sortBy("brand")
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.build();
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LOGGER.info(params.toString());
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LOGGER.info(new SearchService().search(params));
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}
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}
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