-
Notifications
You must be signed in to change notification settings - Fork 292
/
StructPropertyValueProvider.java
135 lines (119 loc) · 5.31 KB
/
StructPropertyValueProvider.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
127
128
129
130
131
132
133
134
135
/*
* Copyright 2017-2018 the original author or 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
*
* https://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 com.google.cloud.spring.data.spanner.core.convert;
import java.util.List;
import java.util.stream.Collectors;
import com.google.cloud.spanner.Struct;
import com.google.cloud.spanner.Type;
import com.google.cloud.spring.data.spanner.core.mapping.SpannerDataException;
import com.google.cloud.spring.data.spanner.core.mapping.SpannerPersistentProperty;
import org.springframework.data.mapping.model.PropertyValueProvider;
/**
* A {@link PropertyValueProvider} based on a Struct that uses the
* {@link ConverterAwareMappingSpannerEntityReader} to convert resulting values from the
* {@link StructAccessor}.
*
* @author Balint Pato
* @author Chengyuan Zhao
*
* @since 1.1
*/
class StructPropertyValueProvider implements PropertyValueProvider<SpannerPersistentProperty> {
private final SpannerCustomConverter readConverter;
private SpannerEntityReader entityReader;
private StructAccessor structAccessor;
private boolean allowMissingColumns;
/**
* Constructor. Missing columns in nested struct column values for corresponding nested Java
* object properties is not allowed.
* @param structAccessor an accessor used to obtain column values from the struct.
* @param readConverter a converter used to convert between struct column types and the required
* java types.
* @param entityReader a reader used to access the data from each column of the struct.
*/
StructPropertyValueProvider(StructAccessor structAccessor, SpannerCustomConverter readConverter,
SpannerEntityReader entityReader) {
this(structAccessor, readConverter, entityReader, false);
}
/**
* Constructor.
* @param structAccessor an accessor used to obtain column values from the struct.
* @param readConverter a converter used to convert between struct column types and the required
* java types.
* @param entityReader a reader used to access the data from each column of the struct.
* @param allowMissingColumns if a nested struct is within this struct's column, then if true
* missing columns in the nested struct are also allowed for the corresponding nested Java object.
*/
StructPropertyValueProvider(StructAccessor structAccessor, SpannerCustomConverter readConverter,
SpannerEntityReader entityReader, boolean allowMissingColumns) {
this.structAccessor = structAccessor;
this.readConverter = readConverter;
this.entityReader = entityReader;
this.allowMissingColumns = allowMissingColumns;
}
@Override
@SuppressWarnings("unchecked")
public <T> T getPropertyValue(SpannerPersistentProperty spannerPersistentProperty) {
String colName = spannerPersistentProperty.getColumnName();
if (!this.structAccessor.hasColumn(colName)) {
throw new SpannerDataException("Column not found: " + colName);
}
if (this.structAccessor.isNull(colName)) {
return null;
}
Class propType = spannerPersistentProperty.getType();
Object value = ConversionUtils.isIterableNonByteArrayType(propType)
? readIterableWithConversion(spannerPersistentProperty)
: readSingleWithConversion(spannerPersistentProperty);
if (value == null) {
throw new SpannerDataException(String.format(
"The value in column with name %s"
+ " could not be converted to the corresponding property in the entity."
+ " The property's type is %s.",
colName, propType));
}
return (T) value;
}
@SuppressWarnings("unchecked")
private <T> T readSingleWithConversion(
SpannerPersistentProperty spannerPersistentProperty) {
String colName = spannerPersistentProperty.getColumnName();
Type.Code spannerColumnType = spannerPersistentProperty.getAnnotatedColumnItemType();
if (spannerColumnType == Type.Code.JSON) {
Object value = this.structAccessor.getSingleJsonValue(colName, spannerPersistentProperty.getType());
return (T) value;
}
Object value = this.structAccessor.getSingleValue(colName);
return (value != null) ? convertOrRead((Class<T>) spannerPersistentProperty.getType(), value) : null;
}
@SuppressWarnings("unchecked")
private <T> Iterable<T> readIterableWithConversion(
SpannerPersistentProperty spannerPersistentProperty) {
String colName = spannerPersistentProperty.getColumnName();
List<?> listValue = this.structAccessor.getListValue(colName);
return listValue.stream()
.map(item -> convertOrRead((Class<T>) spannerPersistentProperty.getColumnInnerType(), item))
.collect(Collectors.toList());
}
private <T> T convertOrRead(Class<T> targetType, Object sourceValue) {
Class<?> sourceClass = sourceValue.getClass();
return (Struct.class.isAssignableFrom(sourceClass)
&& !this.readConverter.canConvert(sourceClass, targetType))
? this.entityReader.read(targetType, (Struct) sourceValue, null,
this.allowMissingColumns)
: this.readConverter.convert(sourceValue, targetType);
}
}