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Kubernetes Service Discovery for Hazelcast Discovery SPI
/*
* Copyright (c) 2008-2019, 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.hazelcast.internal.json.Json;
import com.hazelcast.internal.json.JsonArray;
import com.hazelcast.internal.json.JsonObject;
import com.hazelcast.internal.json.JsonValue;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
/**
* 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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
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 || value.isNull()) {
return defaultValue;
} else {
return value.asObject();
}
}
/**
* Transforms the provided {@link JsonObject} int a map of name/value pairs.
*
* @param object the JSON object
* @return map from JSON name to value
*/
public static Map fromJsonObject(JsonObject object) {
if (object == null || object.isNull() || object.isEmpty()) {
return Collections.emptyMap();
}
Map map = MapUtil.createHashMap(object.size());
for (String propertyName : object.names()) {
map.put(propertyName, object.get(propertyName).asString());
}
return map;
}
/**
* Transforms the provided map of name/value pairs into a {@link JsonObject}.
*
* @param map map of JSON name-value pairs
* @return the JSON object
*/
public static JsonObject toJsonObject(Map map) {
JsonObject properties = new JsonObject();
for (Map.Entry property : map.entrySet()) {
properties.add(property.getKey(), Json.value(property.getValue().toString()));
}
return properties;
}
/**
* 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);
}
}
/**
* Returns the JSON representation of the provided {@code value}
*
* @param value the value to serialize to JSON
* @return the serialized value
*/
public static String toJson(Object value) {
if (value instanceof String) {
return '"' + (String) value + '"';
} else if (value instanceof Collection) {
return "[" + toJsonCollection((Collection) value) + "]";
} else if (value instanceof JsonValue) {
return value.toString();
} else {
throw new IllegalArgumentException("Unable to convert " + value + " to JSON");
}
}
/**
* Serializes a collection of objects into its JSON representation.
*
* @param objects collection of items to be serialized into JSON
* @return the serialized JSON
*/
private static String toJsonCollection(Collection objects) {
Iterator iterator = objects.iterator();
if (!iterator.hasNext()) {
return "";
}
final Object first = iterator.next();
if (!iterator.hasNext()) {
return toJson(first);
}
final StringBuilder buf = new StringBuilder();
if (first != null) {
buf.append(toJson(first));
}
while (iterator.hasNext()) {
buf.append(',');
final Object obj = iterator.next();
if (obj != null) {
buf.append(toJson(obj));
}
}
return buf.toString();
}
}