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
111
112
113
114
115
116
117
118
119
120
121
122
|
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2022 Bell Canada. 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.apex.plugins.context.schema.json;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import com.worldturner.medeia.api.SchemaSource;
import com.worldturner.medeia.api.StringInputSource;
import com.worldturner.medeia.api.StringSchemaSource;
import com.worldturner.medeia.api.gson.MedeiaGsonApi;
import com.worldturner.medeia.schema.validation.SchemaValidator;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;
import org.onap.policy.apex.context.ContextRuntimeException;
import org.onap.policy.apex.context.impl.schema.AbstractSchemaHelper;
import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
/**
* This class is the implementation of the {@link org.onap.policy.apex.context.SchemaHelper} interface for JSON schema.
*/
public class JsonSchemaHelper extends AbstractSchemaHelper {
private static final Gson gson = new Gson();
private MedeiaGsonApi api = new MedeiaGsonApi();
private SchemaValidator validator;
@Override
public void init(final AxKey userKey, final AxContextSchema schema) {
super.init(userKey, schema);
try {
SchemaSource source = new StringSchemaSource(schema.getSchema());
validator = api.loadSchema(source);
} catch (final Exception e) {
final String resultSting = userKey.getId() + ": json context schema \"" + schema.getId()
+ "\" schema is invalid, schema: " + schema.getSchema();
throw new ContextRuntimeException(resultSting, e);
}
}
@Override
public Object createNewInstance(final String stringValue) {
return unmarshal(stringValue);
}
@Override
public Object createNewInstance(final Object incomingObject) {
if (incomingObject instanceof JsonElement) {
final var elementJsonString = gson.toJson((JsonElement) incomingObject);
return createNewInstance(elementJsonString);
} else {
final var returnString =
getUserKey().getId() + ": the object \"" + incomingObject + "\" is not an instance of JsonObject";
throw new ContextRuntimeException(returnString);
}
}
@Override
public Object unmarshal(Object object) {
// If an object is already in the correct format, just carry on
if (passThroughObject(object)) {
return object;
}
var objectString = (String) object;
JsonReader reader = api.createJsonReader(validator, new StringInputSource(objectString));
return gson.fromJson(reader, Object.class);
}
@Override
public String marshal2String(Object schemaObject) {
StringWriter stringWriter = new StringWriter();
validateAndDecode(schemaObject, stringWriter);
return stringWriter.toString();
}
@Override
public Object marshal2Object(Object schemaObject) {
return validateAndDecode(schemaObject, new StringWriter());
}
private JsonElement validateAndDecode(Object schemaObject, StringWriter stringWriter) {
JsonWriter jsonWriter = api.createJsonWriter(validator, stringWriter);
jsonWriter.setIndent(" "); // to enable pretty print
JsonElement jsonObj = gson.toJsonTree(schemaObject);
gson.toJson(jsonObj, jsonWriter);
return jsonObj;
}
/**
* Check if we can pass this object straight through encoding or decoding.
*
* @param object the object to check
* @return true if it's a straight pass through
*/
private boolean passThroughObject(final Object object) {
return (object instanceof JsonElement || object instanceof Map || object instanceof List);
}
}
|
