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/*
* Copyright 2019 The gRPC Authors
*
* 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 io.grpc.internal;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Helper utility to work with JSON values in Java types.
*/
public class JsonUtil {
/**
* Gets a list from an object for the given key. If the key is not present, this returns null.
* If the value is not a List, throws an exception.
*/
@SuppressWarnings("unchecked")
@Nullable
public static List getList(Map obj, String key) {
assert key != null;
if (!obj.containsKey(key)) {
return null;
}
Object value = obj.get(key);
if (!(value instanceof List)) {
throw new ClassCastException(
String.format("value '%s' for key '%s' in '%s' is not List", value, key, obj));
}
return (List) value;
}
/**
* Gets an object from an object for the given key. If the key is not present, this returns null.
* If the value is not a Map, throws an exception.
*/
@SuppressWarnings("unchecked")
@Nullable
public static Map getObject(Map obj, String key) {
assert key != null;
if (!obj.containsKey(key)) {
return null;
}
Object value = obj.get(key);
if (!(value instanceof Map)) {
throw new ClassCastException(
String.format("value '%s' for key '%s' in '%s' is not object", value, key, obj));
}
return (Map) value;
}
/**
* Gets a double from an object for the given key. If the key is not present, this returns null.
* If the value is not a Double, throws an exception.
*/
@Nullable
public static Double getDouble(Map obj, String key) {
assert key != null;
if (!obj.containsKey(key)) {
return null;
}
Object value = obj.get(key);
if (!(value instanceof Double)) {
throw new ClassCastException(
String.format("value '%s' for key '%s' in '%s' is not Double", value, key, obj));
}
return (Double) value;
}
/**
* Gets a string from an object for the given key. If the key is not present, this returns null.
* If the value is not a String, throws an exception.
*/
@Nullable
public static String getString(Map obj, String key) {
assert key != null;
if (!obj.containsKey(key)) {
return null;
}
Object value = obj.get(key);
if (!(value instanceof String)) {
throw new ClassCastException(
String.format("value '%s' for key '%s' in '%s' is not String", value, key, obj));
}
return (String) value;
}
/**
* Gets a boolean from an object for the given key. If the key is not present, this returns null.
* If the value is not a Boolean, throws an exception.
*/
@Nullable
public static Boolean getBoolean(Map obj, String key) {
assert key != null;
if (!obj.containsKey(key)) {
return null;
}
Object value = obj.get(key);
if (!(value instanceof Boolean)) {
throw new ClassCastException(
String.format("value '%s' for key '%s' in '%s' is not Boolean", value, key, obj));
}
return (Boolean) value;
}
/**
* Casts a list of unchecked JSON values to a list of checked objects in Java type.
* If the given list contains a value that is not a Map, throws an exception.
*/
@SuppressWarnings("unchecked")
public static List> checkObjectList(List rawList) {
for (int i = 0; i < rawList.size(); i++) {
if (!(rawList.get(i) instanceof Map)) {
throw new ClassCastException(
String.format("value %s for idx %d in %s is not object", rawList.get(i), i, rawList));
}
}
return (List>) rawList;
}
/**
* Casts a list of unchecked JSON values to a list of String. If the given list
* contains a value that is not a String, throws an exception.
*/
@SuppressWarnings("unchecked")
public static List checkStringList(List rawList) {
for (int i = 0; i < rawList.size(); i++) {
if (!(rawList.get(i) instanceof String)) {
throw new ClassCastException(
String.format(
"value '%s' for idx %d in '%s' is not string", rawList.get(i), i, rawList));
}
}
return (List) rawList;
}
}
