61 lines
2.2 KiB
Java
61 lines
2.2 KiB
Java
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2017 Gopinath Langote
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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package com.iluwatar.partialresponse;
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import java.lang.reflect.Field;
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/**
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* Map a video to json
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*/
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public class FieldJsonMapper {
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/**
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* @param video object containing video information
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* @param fields fields information to get
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* @return json of required fields from video
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*/
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public String toJson(Video video, String[] fields) throws Exception {
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StringBuilder json = new StringBuilder().append("{");
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for (int i = 0, fieldsLength = fields.length; i < fieldsLength; i++) {
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json.append(getString(video, Video.class.getDeclaredField(fields[i])));
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if (i != fieldsLength - 1) {
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json.append(",");
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}
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}
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json.append("}");
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return json.toString();
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}
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private String getString(Video video, Field declaredField) throws IllegalAccessException {
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declaredField.setAccessible(true);
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Object value = declaredField.get(video);
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if (declaredField.get(video) instanceof Integer) {
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return "\"" + declaredField.getName() + "\"" + ": " + value;
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}
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return "\"" + declaredField.getName() + "\"" + ": " + "\"" + value.toString() + "\"";
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}
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}
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