/
JsonDeserializer.java
126 lines (113 loc) · 4.07 KB
/
JsonDeserializer.java
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
123
124
125
126
package org.wikidata.wdtk.datamodel.helpers;
/*-
* #%L
* Wikidata Toolkit Data Model
* %%
* Copyright (C) 2014 - 2020 Wikidata Toolkit Developers
* %%
* 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.
* #L%
*/
import java.io.IOException;
import com.fasterxml.jackson.databind.ObjectReader;
import org.wikidata.wdtk.datamodel.implementation.*;
import org.wikidata.wdtk.datamodel.interfaces.*;
import com.fasterxml.jackson.databind.DeserializationFeature;
/**
* Helper to deserialize datamodel objects from their
* JSON representation.
*
* We accept empty arrays as empty maps since there has
* been a confusion in the past between the two:
* https://phabricator.wikimedia.org/T138104
*
* @author Antonin Delpeuch
*/
public class JsonDeserializer {
private ObjectReader entityDocumentReader;
private ObjectReader itemReader;
private ObjectReader propertyReader;
private ObjectReader lexemeReader;
private ObjectReader mediaInfoReader;
private ObjectReader entityRedirectReader;
/**
* Constructs a new JSON deserializer for the
* designated site.
*
* @param siteIri
* Root IRI of the site to deserialize for
*/
public JsonDeserializer(String siteIri) {
DatamodelMapper mapper = new DatamodelMapper(siteIri);
entityDocumentReader = mapper.readerFor(EntityDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
itemReader = mapper.readerFor(ItemDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
propertyReader = mapper.readerFor(PropertyDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
lexemeReader = mapper.readerFor(LexemeDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
mediaInfoReader = mapper.readerFor(MediaInfoDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
entityRedirectReader = mapper.readerFor(EntityRedirectDocumentImpl.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
}
/**
* Deserializes a JSON string into an {@link ItemDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public ItemDocument deserializeItemDocument(String json) throws IOException {
return itemReader.readValue(json);
}
/**
* Deserializes a JSON string into a {@link PropertyDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public PropertyDocument deserializePropertyDocument(String json) throws IOException {
return propertyReader.readValue(json);
}
/**
* Deserializes a JSON string into a {@link LexemeDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public LexemeDocument deserializeLexemeDocument(String json) throws IOException {
return lexemeReader.readValue(json);
}
/**
* Deserializes a JSON string into a {@link MediaInfoDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public MediaInfoDocument deserializeMediaInfoDocument(String json) throws IOException {
return mediaInfoReader.readValue(json);
}
/**
* Deserializes a JSON string into a {@link EntityDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public EntityDocument deserializeEntityDocument(String json) throws IOException {
return entityDocumentReader.readValue(json);
}
/**
* Deserializes a JSON string into a {@link EntityRedirectDocument}.
* @throws IOException
if the JSON payload is invalid
*/
public EntityRedirectDocument deserializeEntityRedirectDocument(String json) throws IOException {
return entityRedirectReader.readValue(json);
}
}