1 // Copyright 2020 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //      http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 package com.google.api.generator.engine.ast;
16 
17 import com.google.common.base.Preconditions;
18 import java.util.Collection;
19 import java.util.Map;
20 import java.util.Objects;
21 
22 public class NodeValidator {
checkNoNullElements( Collection<?> collection, String fieldTypeName, String nodeContextInfo)23   public static void checkNoNullElements(
24       Collection<?> collection, String fieldTypeName, String nodeContextInfo) {
25     Preconditions.checkState(
26         collection.stream().allMatch(e -> !Objects.isNull(e)),
27         String.format(
28             "Found null expression in %s %s for %s", fieldTypeName, collection, nodeContextInfo));
29   }
30 
checkNoNullElements( Map<?, ?> map, String fieldTypeName, String nodeContextInfo)31   public static void checkNoNullElements(
32       Map<?, ?> map, String fieldTypeName, String nodeContextInfo) {
33     checkNoNullElements(map.keySet(), String.format("key of %s", fieldTypeName), nodeContextInfo);
34     checkNoNullElements(
35         map.values(), String.format("values of %s", fieldTypeName), nodeContextInfo);
36   }
37 }
38