api.util.JsonUtil.java Source code

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Here is the source code for api.util.JsonUtil.java

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/* * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 api.util;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import javax.xml.bind.DatatypeConverter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.regex.Pattern;

/**
 * @author Joseph Kapizza <joseph@rest4j.com>
 */
public class JsonUtil {
    public static Number asNumber(Object val) {
        if (val instanceof Number)
            return (Number) val;
        if (val == JSONObject.NULL)
            return null;
        if (val instanceof String) {
            String str = (String) val;
            try {
                return Integer.parseInt(str);
            } catch (Exception ex) {
            }
            try {
                return Long.parseLong(str);
            } catch (Exception ex) {
            }
            try {
                return Double.parseDouble(str);
            } catch (Exception ex) {
            }
        }
        throw new IllegalArgumentException("Not a number: " + val);
    }

    public static String asString(Object val) {
        if (val == JSONObject.NULL)
            return null;
        return val.toString();
    }

    public static Boolean asBoolean(Object val) {
        if (val == JSONObject.NULL)
            return null;
        if (val instanceof Boolean)
            return (Boolean) val;
        if (val instanceof String)
            return Boolean.parseBoolean((String) val);
        if (val instanceof Number)
            return ((Number) val).intValue() != 0;
        throw new IllegalArgumentException("Not a boolean: " + val);
    }

    static Pattern iso8601Timezone = Pattern
            .compile("[^T]*T.*(Z|[+-]([0-9]{4,4}|[0-9][0-9]|[0-9][0-9]:[0-9][0-9]))");

    public static Date asDate(Object val) {
        if (val == JSONObject.NULL)
            return null;
        if (val instanceof String) {
            String stringValue = (String) val;
            try {
                // try ISO 8601
                Calendar cal = DatatypeConverter.parseDateTime(stringValue);
                if (!iso8601Timezone.matcher(stringValue).matches()) {
                    // timezone is absent from input string. Assume UTC
                    cal.setTimeZone(TimeZone.getTimeZone("UTC"));
                }
                return cal.getTime();
            } catch (IllegalArgumentException iae) {
                // fallback to RFC 2822
                for (String format : new String[] { "EEE, dd MMM yyyy HH:mm:ss Z", "dd MMM yyyy HH:mm:ss Z",
                        "EEE, dd MMM yyyy HH:mm Z", "dd MMM yyyy HH:mm Z", "EEE, dd MMM yyyy HH:mm:ss",
                        "dd MMM yyyy HH:mm:ss", "EEE, dd MMM yyyy HH:mm", "dd MMM yyyy HH:mm" }) {
                    SimpleDateFormat rfc2822Fmt = new SimpleDateFormat(format, Locale.ENGLISH);
                    rfc2822Fmt.setTimeZone(TimeZone.getTimeZone("UTC"));
                    try {
                        return rfc2822Fmt.parse(stringValue);
                    } catch (ParseException e) {
                    }
                }
            }
        } else if (val instanceof Number) {
            return new Date(((Number) val).longValue() * 1000);
        }
        throw new IllegalArgumentException(
                "Value is expected to be a unix timestamp or a string in either ISO 8601 or RFC 2822 format: "
                        + val);
    }

    static ThreadLocal<SimpleDateFormat> JSONDateFormat = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf;
        }
    };

    public static Object asJsonSingleton(Date val) {
        if (val == null)
            return JSONObject.NULL;
        // equivalent of Date.toJSON in JavaScript
        return JSONDateFormat.get().format(val);
    }

    public static Object asJsonSingleton(Object val) {
        if (val == null)
            return JSONObject.NULL;
        return val;
    }

    public static Object asJsonArray(List list, JsonElementFactory fac) {
        if (list == null)
            return JSONObject.NULL;
        if (list instanceof JsonArrayList)
            return ((JsonArrayList) list).array;
        JSONArray array = new JSONArray();
        int i = 0;
        try {
            for (Object element : list) {
                array.put(i++, fac.json(element));
            }
        } catch (JSONException e) {
            throw new IllegalArgumentException(e);
        }
        return array;
    }

    public static Object asJsonMap(Map<String, ?> map, JsonElementFactory fac) {
        if (map == null)
            return JSONObject.NULL;
        if (map instanceof JsonObjectMap)
            return ((JsonObjectMap) map).object;
        JSONObject obj = new JSONObject();
        try {
            for (Map.Entry<String, ?> entry : map.entrySet()) {
                obj.put(entry.getKey(), fac.json(entry.getValue()));
            }
        } catch (JSONException e) {
            throw new IllegalArgumentException(e);
        }
        return obj;
    }

}