/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.util;
import com.eclipsesource.json.JsonArray;
import com.eclipsesource.json.JsonObject;
import com.eclipsesource.json.JsonValue;
/**
* Utility class to deal with Json.
*/
public final class JsonUtil {
private JsonUtil() {
}
/**
* Returns a field in a Json object as an int.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as an int
*/
public static int getInt(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asInt();
}
/**
* Returns a field in a Json object as an int.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as an int
*/
public static int getInt(JsonObject object, String field, int defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asInt();
}
}
/**
* Returns a field in a Json object as a long.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as a long
*/
public static long getLong(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asLong();
}
/**
* Returns a field in a Json object as a long.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a long
*/
public static long getLong(JsonObject object, String field, long defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asLong();
}
}
/**
* Returns a field in a Json object as a double.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as a double
*/
public static double getDouble(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asDouble();
}
/**
* Returns a field in a Json object as a double.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a double
*/
public static double getDouble(JsonObject object, String field, double defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asDouble();
}
}
/**
* Returns a field in a Json object as a float.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as a float
*/
public static float getFloat(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asFloat();
}
/**
* Returns a field in a Json object as a float.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a float
*/
public static float getFloat(JsonObject object, String field, float defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asFloat();
}
}
/**
* Returns a field in a Json object as a string.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as a string
*/
public static String getString(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asString();
}
/**
* Returns a field in a Json object as a string.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a string
*/
public static String getString(JsonObject object, String field, String defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asString();
}
}
/**
* Returns a field in a Json object as a boolean.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as a boolean
*/
public static boolean getBoolean(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asBoolean();
}
/**
* Returns a field in a Json object as a boolean.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a boolean
*/
public static boolean getBoolean(JsonObject object, String field, boolean defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asBoolean();
}
}
/**
* Returns a field in a Json object as an array.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @return the Json field value as an array
*/
public static JsonArray getArray(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asArray();
}
/**
* Returns a field in a Json object as an array.
*
* @param object the Json Object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a Json array
*/
public static JsonArray getArray(JsonObject object, String field, JsonArray defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asArray();
}
}
/**
* Returns a field in a Json object as an object.
* Throws IllegalArgumentException if the field value is null.
*
* @param object the Json object
* @param field the field in the Json object to return
* @return the Json field value as a Json object
*/
public static JsonObject getObject(JsonObject object, String field) {
final JsonValue value = object.get(field);
throwExceptionIfNull(value, field);
return value.asObject();
}
/**
* Returns a field in a Json object as an object.
*
* @param object the Json object
* @param field the field in the Json object to return
* @param defaultValue a default value for the field if the field value is null
* @return the Json field value as a Json object
*/
public static JsonObject getObject(JsonObject object, String field, JsonObject defaultValue) {
final JsonValue value = object.get(field);
if (value == null) {
return defaultValue;
} else {
return value.asObject();
}
}
/**
* Throws IllegalArgumentException if the Json field is not found.
*/
private static void throwExceptionIfNull(JsonValue value, String field) {
if (value == null) {
throw new IllegalArgumentException("No field found: " + field);
}
}
}