org.cuberact.json.formatter.JsonFormatterBase Maven / Gradle / Ivy

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Fast JSON parser with highly customizable input, output and builder.
There is a newer version: 1.6.0
/*
 * Copyright 2017 Michal Nikodim
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.cuberact.json.formatter;

import org.cuberact.json.Json;
import org.cuberact.json.output.JsonOutput;

/**
 * @author Michal Nikodim ([email protected])
 */
public abstract class JsonFormatterBase implements JsonFormatter {

    @Override
    public void appendJsonObjectAttribute(CharSequence attribute, JsonOutput output) {
        output.write("\"");
        escape(attribute, output);
        output.write("\"");
    }

    @Override
    public void appendJsonObjectValue(Object value, JsonOutput output) {
        if (value instanceof Json) {
            ((Json) value).toOutput(this, output);
        } else if (value instanceof CharSequence) {
            output.write("\"");
            escape((CharSequence) value, output);
            output.write("\"");
        } else if (value instanceof Double || value instanceof Float) {
            output.write(String.valueOf(value).replace(',', '.'));
        } else {
            output.write(String.valueOf(value));
        }
    }

    @Override
    public void appendJsonArrayValue(Object value, JsonOutput output) {
        appendJsonObjectValue(value, output);
    }

    public static void escape(CharSequence input, JsonOutput output) {
        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            switch (c) {
                case '\\':
                case '/':
                case '"':
                    output.write('\\');
                    output.write(c);
                    break;
                case '\b':
                    output.write("\\b");
                    break;
                case '\f':
                    output.write("\\f");
                    break;
                case '\n':
                    output.write("\\n");
                    break;
                case '\r':
                    output.write("\\r");
                    break;
                case '\t':
                    output.write("\\t");
                    break;
                default:
                    if (c < ' ') {
                        String hex = Integer.toHexString(c);
                        output.write("\\u");
                        switch (hex.length()) {
                            case 1:
                                output.write("000");
                                break;
                            case 2:
                                output.write("00");
                                break;
                            case 3:
                                output.write("0");
                                break;
                        }
                        output.write(hex);
                    } else {
                        output.write(c);
                    }
            }
        }
    }
}