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java/src/main/java/com/jsoniter/Codegen.java at master · sowapplication/java · GitHub
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jsoniter
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Codegen.java
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jsoniter
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Codegen.java
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package
com
.
jsoniter
;
import
com
.
jsoniter
.
spi
.*;
import
java
.
io
.
File
;
import
java
.
io
.
FileOutputStream
;
import
java
.
io
.
IOException
;
import
java
.
io
.
OutputStreamWriter
;
import
java
.
lang
.
reflect
.
ParameterizedType
;
import
java
.
lang
.
reflect
.
Type
;
import
java
.
lang
.
reflect
.
WildcardType
;
import
java
.
util
.*;
class
Codegen
{
// only read/write when generating code with synchronized protection
private
final
static
Set
<
String
>
generatedClassNames
=
new
HashSet
<
String
>();
static
CodegenAccess
.
StaticCodegenTarget
isDoingStaticCodegen
=
null
;
static
Decoder
getDecoder
(
String
cacheKey
,
Type
type
) {
Decoder
decoder
=
JsoniterSpi
.
getDecoder
(
cacheKey
);
if
(
decoder
!=
null
) {
return
decoder
;
}
return
gen
(
cacheKey
,
type
);
}
private
synchronized
static
Decoder
gen
(
String
cacheKey
,
Type
type
) {
Decoder
decoder
=
JsoniterSpi
.
getDecoder
(
cacheKey
);
if
(
decoder
!=
null
) {
return
decoder
;
}
List
<
Extension
>
extensions
=
JsoniterSpi
.
getExtensions
();
for
(
Extension
extension
:
extensions
) {
type
=
extension
.
chooseImplementation
(
type
);
}
type
=
chooseImpl
(
type
);
for
(
Extension
extension
:
extensions
) {
decoder
=
extension
.
createDecoder
(
cacheKey
,
type
);
if
(
decoder
!=
null
) {
JsoniterSpi
.
addNewDecoder
(
cacheKey
,
decoder
);
return
decoder
;
}
}
ClassInfo
classInfo
=
new
ClassInfo
(
type
);
decoder
=
CodegenImplNative
.
NATIVE_DECODERS
.
get
(
classInfo
.
clazz
);
if
(
decoder
!=
null
) {
return
decoder
;
}
addPlaceholderDecoderToSupportRecursiveStructure
(
cacheKey
);
try
{
Config
currentConfig
=
JsoniterSpi
.
getCurrentConfig
();
DecodingMode
mode
=
currentConfig
.
decodingMode
();
if
(
mode
==
DecodingMode
.
REFLECTION_MODE
) {
decoder
=
ReflectionDecoderFactory
.
create
(
classInfo
);
return
decoder
;
}
if
(
isDoingStaticCodegen
==
null
) {
try
{
decoder
= (
Decoder
)
Class
.
forName
(
cacheKey
).
newInstance
();
return
decoder
;
}
catch
(
Exception
e
) {
if
(
mode
==
DecodingMode
.
STATIC_MODE
) {
throw
new
JsonException
(
"static gen should provide the decoder we need, but failed to create the decoder"
,
e
);
}
}
}
String
source
=
genSource
(
mode
,
classInfo
);
source
=
"public static java.lang.Object decode_(com.jsoniter.JsonIterator iter) throws java.io.IOException { "
+
source
+
"}"
;
if
(
"true"
.
equals
(
System
.
getenv
(
"JSONITER_DEBUG"
))) {
System
.
out
.
println
(
">>> "
+
cacheKey
);
System
.
out
.
println
(
source
);
}
try
{
generatedClassNames
.
add
(
cacheKey
);
if
(
isDoingStaticCodegen
==
null
) {
decoder
=
DynamicCodegen
.
gen
(
cacheKey
,
source
);
}
else
{
staticGen
(
cacheKey
,
source
);
}
return
decoder
;
}
catch
(
Exception
e
) {
String
msg
=
"failed to generate decoder for: "
+
classInfo
+
" with "
+
Arrays
.
toString
(
classInfo
.
typeArgs
) +
", exception: "
+
e
;
msg
=
msg
+
"
\n
"
+
source
;
throw
new
JsonException
(
msg
,
e
);
}
}
finally
{
JsoniterSpi
.
addNewDecoder
(
cacheKey
,
decoder
);
}
}
private
static
void
addPlaceholderDecoderToSupportRecursiveStructure
(
final
String
cacheKey
) {
JsoniterSpi
.
addNewDecoder
(
cacheKey
,
new
Decoder
() {
@
Override
public
Object
decode
(
JsonIterator
iter
)
throws
IOException
{
Decoder
decoder
=
JsoniterSpi
.
getDecoder
(
cacheKey
);
if
(
this
==
decoder
) {
for
(
int
i
=
0
;
i
<
30
;
i
++) {
decoder
=
JsoniterSpi
.
getDecoder
(
cacheKey
);
if
(
this
==
decoder
) {
try
{
Thread
.
sleep
(
1000
);
}
catch
(
InterruptedException
e
) {
throw
new
JsonException
(
e
);
}
}
else
{
break
;
}
}
if
(
this
==
decoder
) {
throw
new
JsonException
(
"internal error: placeholder is not replaced with real decoder"
);
}
}
return
decoder
.
decode
(
iter
);
}
});
}
public
static
boolean
canStaticAccess
(
String
cacheKey
) {
return
generatedClassNames
.
contains
(
cacheKey
);
}
private
static
Type
chooseImpl
(
Type
type
) {
Type
[]
typeArgs
=
new
Type
[
0
];
Class
clazz
;
if
(
type
instanceof
ParameterizedType
) {
ParameterizedType
pType
= (
ParameterizedType
)
type
;
clazz
= (
Class
)
pType
.
getRawType
();
typeArgs
=
pType
.
getActualTypeArguments
();
}
else
if
(
type
instanceof
WildcardType
) {
return
Object
.
class
;
}
else
{
clazz
= (
Class
)
type
;
}
Class
implClazz
=
JsoniterSpi
.
getTypeImplementation
(
clazz
);
if
(
Collection
.
class
.
isAssignableFrom
(
clazz
)) {
Type
compType
=
Object
.
class
;
if
(
typeArgs
.
length
==
0
) {
// default to List<Object>
}
else
if
(
typeArgs
.
length
==
1
) {
compType
=
typeArgs
[
0
];
}
else
{
throw
new
IllegalArgumentException
(
"can not bind to generic collection without argument types, "
+
"try syntax like TypeLiteral<List<Integer>>{}"
);
}
if
(
clazz
==
List
.
class
) {
clazz
=
implClazz
==
null
?
ArrayList
.
class
:
implClazz
;
}
else
if
(
clazz
==
Set
.
class
) {
clazz
=
implClazz
==
null
?
HashSet
.
class
:
implClazz
;
}
return
GenericsHelper
.
createParameterizedType
(
new
Type
[]{
compType
},
null
,
clazz
);
}
if
(
Map
.
class
.
isAssignableFrom
(
clazz
)) {
Type
keyType
=
String
.
class
;
Type
valueType
=
Object
.
class
;
if
(
typeArgs
.
length
==
0
) {
// default to Map<String, Object>
}
else
if
(
typeArgs
.
length
==
2
) {
keyType
=
typeArgs
[
0
];
valueType
=
typeArgs
[
1
];
}
else
{
throw
new
IllegalArgumentException
(
"can not bind to generic collection without argument types, "
+
"try syntax like TypeLiteral<Map<String, String>>{}"
);
}
if
(
clazz
==
Map
.
class
) {
clazz
=
implClazz
==
null
?
HashMap
.
class
:
implClazz
;
}
if
(
keyType
==
Object
.
class
) {
keyType
=
String
.
class
;
}
MapKeyDecoders
.
registerOrGetExisting
(
keyType
);
return
GenericsHelper
.
createParameterizedType
(
new
Type
[]{
keyType
,
valueType
},
null
,
clazz
);
}
if
(
implClazz
!=
null
) {
if
(
typeArgs
.
length
==
0
) {
return
implClazz
;
}
else
{
return
GenericsHelper
.
createParameterizedType
(
typeArgs
,
null
,
implClazz
);
}
}
return
type
;
}
private
static
void
staticGen
(
String
cacheKey
,
String
source
)
throws
IOException
{
createDir
(
cacheKey
);
String
fileName
=
cacheKey
.
replace
(
'.'
,
'/'
) +
".java"
;
FileOutputStream
fileOutputStream
=
new
FileOutputStream
(
new
File
(
isDoingStaticCodegen
.
outputDir
,
fileName
));
try
{
OutputStreamWriter
writer
=
new
OutputStreamWriter
(
fileOutputStream
);
try
{
staticGen
(
cacheKey
,
writer
,
source
);
}
finally
{
writer
.
close
();
}
}
finally
{
fileOutputStream
.
close
();
}
}
private
static
void
staticGen
(
String
cacheKey
,
OutputStreamWriter
writer
,
String
source
)
throws
IOException
{
String
className
=
cacheKey
.
substring
(
cacheKey
.
lastIndexOf
(
'.'
) +
1
);
String
packageName
=
cacheKey
.
substring
(
0
,
cacheKey
.
lastIndexOf
(
'.'
));
writer
.
write
(
"package "
+
packageName
+
";
\n
"
);
writer
.
write
(
"public class "
+
className
+
" implements com.jsoniter.spi.Decoder {
\n
"
);
writer
.
write
(
source
);
writer
.
write
(
"public java.lang.Object decode(com.jsoniter.JsonIterator iter) throws java.io.IOException {
\n
"
);
writer
.
write
(
"return decode_(iter);
\n
"
);
writer
.
write
(
"}
\n
"
);
writer
.
write
(
"}
\n
"
);
}
private
static
void
createDir
(
String
cacheKey
) {
String
[]
parts
=
cacheKey
.
split
(
"
\\
."
);
File
parent
=
new
File
(
isDoingStaticCodegen
.
outputDir
);
for
(
int
i
=
0
;
i
<
parts
.
length
-
1
;
i
++) {
String
part
=
parts
[
i
];
File
current
=
new
File
(
parent
,
part
);
current
.
mkdir
();
parent
=
current
;
}
}
private
static
String
genSource
(
DecodingMode
mode
,
ClassInfo
classInfo
) {
if
(
classInfo
.
clazz
.
isArray
()) {
return
CodegenImplArray
.
genArray
(
classInfo
);
}
if
(
Map
.
class
.
isAssignableFrom
(
classInfo
.
clazz
)) {
return
CodegenImplMap
.
genMap
(
classInfo
);
}
if
(
Collection
.
class
.
isAssignableFrom
(
classInfo
.
clazz
)) {
return
CodegenImplArray
.
genCollection
(
classInfo
);
}
if
(
classInfo
.
clazz
.
isEnum
()) {
return
CodegenImplEnum
.
genEnum
(
classInfo
);
}
ClassDescriptor
desc
=
ClassDescriptor
.
getDecodingClassDescriptor
(
classInfo
,
false
);
if
(
shouldUseStrictMode
(
mode
,
desc
)) {
return
CodegenImplObjectStrict
.
genObjectUsingStrict
(
desc
);
}
else
{
return
CodegenImplObjectHash
.
genObjectUsingHash
(
desc
);
}
}
private
static
boolean
shouldUseStrictMode
(
DecodingMode
mode
,
ClassDescriptor
desc
) {
if
(
mode
==
DecodingMode
.
DYNAMIC_MODE_AND_MATCH_FIELD_STRICTLY
) {
return
true
;
}
List
<
Binding
>
allBindings
=
desc
.
allDecoderBindings
();
for
(
Binding
binding
:
allBindings
) {
if
(
binding
.
asMissingWhenNotPresent
||
binding
.
asExtraWhenPresent
||
binding
.
shouldSkip
) {
// only slice support mandatory tracking
return
true
;
}
}
if
(
desc
.
asExtraForUnknownProperties
) {
// only slice support unknown field tracking
return
true
;
}
if
(!
desc
.
keyValueTypeWrappers
.
isEmpty
()) {
return
true
;
}
boolean
hasBinding
=
false
;
for
(
Binding
allBinding
:
allBindings
) {
if
(
allBinding
.
fromNames
.
length
>
0
) {
hasBinding
=
true
;
}
}
if
(!
hasBinding
) {
// empty object can only be handled by strict mode
return
true
;
}
return
false
;
}
public
static
void
staticGenDecoders
(
TypeLiteral
[]
typeLiterals
,
CodegenAccess
.
StaticCodegenTarget
staticCodegenTarget
) {
isDoingStaticCodegen
=
staticCodegenTarget
;
for
(
TypeLiteral
typeLiteral
:
typeLiterals
) {
gen
(
typeLiteral
.
getDecoderCacheKey
(),
typeLiteral
.
getType
());
}
}
}
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