1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/*
* ============LICENSE_START=======================================================
* Copyright (C) 2020 AT&T Intellectual Property. 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.utils.coder;
import com.worldturner.medeia.api.JsonSchemaVersion;
import com.worldturner.medeia.api.SchemaSource;
import com.worldturner.medeia.api.StringSchemaSource;
import com.worldturner.medeia.api.ValidationFailedException;
import com.worldturner.medeia.api.gson.MedeiaGsonApi;
import com.worldturner.medeia.schema.validation.SchemaValidator;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import lombok.NonNull;
import lombok.ToString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Extension to the StandardCoder to support streaming validation
* against a Draft-07 Json schema specification.
*/
@ToString
public class StandardValCoder extends StandardCoder {
// The medeia-validator library integrates better than
// other libraries considered with GSON, and therefore
// the StandardCoder.
private static final Logger logger = LoggerFactory.getLogger(StandardValCoder.class);
private final MedeiaGsonApi validatorApi = new MedeiaGsonApi();
private final SchemaValidator validator;
/**
* StandardCoder with validation.
*/
public StandardValCoder(@NonNull String jsonSchema, @NonNull String name) {
SchemaSource schemaSource =
new StringSchemaSource(jsonSchema, JsonSchemaVersion.DRAFT07, null, name);
this.validator = validatorApi.loadSchema(schemaSource);
}
@Override
protected String toJson(@NonNull Object object) {
StringWriter output = new StringWriter();
toJson(output, object);
return String.valueOf(output);
}
@Override
protected void toJson(@NonNull Writer target, @NonNull Object object) {
getGSON().toJson(object, object.getClass(), validatorApi.createJsonWriter(validator, target));
}
@Override
protected <T> T fromJson(@NonNull Reader source, @NonNull Class<T> clazz) {
return convertFromDouble(clazz, getGSON().fromJson(validatorApi.createJsonReader(validator, source), clazz));
}
@Override
protected <T> T fromJson(String json, Class<T> clazz) {
StringReader reader = new StringReader(json);
return convertFromDouble(clazz, getGSON().fromJson(validatorApi.createJsonReader(validator, reader), clazz));
}
/**
* Is the json conformant?.
*/
public boolean isConformant(@NonNull String json) {
try {
conformance(json);
} catch (CoderException e) {
logger.info("JSON is not conformant to schema {}", e);
return false;
}
return true;
}
/**
* Check a json string for conformance against its schema definition.
*/
public void conformance(@NonNull String json) throws CoderException {
try {
validatorApi.parseAll(validatorApi.createJsonReader(validator, new StringReader(json)));
} catch (ValidationFailedException e) {
throw new CoderException(e);
}
}
}
|
