com.crushpaper.JsonBuilder.java Source code

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Here is the source code for com.crushpaper.JsonBuilder.java

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/*
Copyright 2015 CrushPaper.com.
    
This file is part of CrushPaper.
    
CrushPaper is free software: you can redistribute it and/or modify
it under the terms of version 3 of the GNU Affero General Public
License as published by the Free Software Foundation.
    
CrushPaper is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with CrushPaper.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.crushpaper;

import org.apache.commons.lang3.StringEscapeUtils;

/** A utility class that helps with creation of JSON data. */
public class JsonBuilder {
    /** Returns the value JSON encoded and quoted. */
    static String quote(String value) {
        if (value == null) {
            return "null";
        }

        return "\"" + StringEscapeUtils.escapeJson(value) + "\"";
    }

    /** Appends indentation to `result`. */
    static public void appendIndentation(int level, StringBuilder result) {
        for (int i = 0; i < level; ++i)
            result.append("  ");
    }

    /** Adds a key and value to a JSON StringBuilder. */
    static boolean addPropertyToJsonString(StringBuilder result, Object value, boolean addedAnyYet, String key,
            int indentationLevel) {
        appendIndentation(indentationLevel, result);
        return addPropertyToJsonString(result, value, addedAnyYet, key);
    }

    /** Adds a key and value to a JSON StringBuilder. */
    static boolean addPropertyToJsonString(StringBuilder result, Object value, boolean addedAnyYet, String key) {
        if (value == null) {
            return addedAnyYet;
        }

        if (value instanceof Boolean && !((Boolean) value)) {
            return addedAnyYet;
        }

        if (addedAnyYet) {
            result.append(",\n");
        }

        result.append("\"");
        result.append(key);
        result.append("\": ");

        if (value instanceof String) {
            result.append(quote((String) value));
        } else {
            result.append(value);
        }

        return true;
    }

}