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java/src/main/java/com/jsoniter/Codegen.java at master · SoftwareKing/java · GitHub
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/
jsoniter
/
Codegen.java
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java
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jsoniter
/
Codegen.java
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package
com
.
jsoniter
;
import
com
.
jsoniter
.
spi
.*;
import
javassist
.
ClassPool
;
import
javassist
.
CtClass
;
import
javassist
.
CtMethod
;
import
javassist
.
CtNewMethod
;
import
java
.
lang
.
reflect
.*;
import
java
.
util
.*;
class
Codegen
{
static
boolean
strictMode
=
false
;
static
ClassPool
pool
=
ClassPool
.
getDefault
();
public
static
void
enableStrictMode
() {
strictMode
=
true
;
}
static
Decoder
getDecoder
(
String
cacheKey
,
Type
type
) {
Decoder
decoder
=
ExtensionManager
.
getDecoder
(
cacheKey
);
if
(
decoder
!=
null
) {
return
decoder
;
}
return
gen
(
cacheKey
,
type
);
}
private
synchronized
static
Decoder
gen
(
String
cacheKey
,
Type
type
) {
Decoder
decoder
=
ExtensionManager
.
getDecoder
(
cacheKey
);
if
(
decoder
!=
null
) {
return
decoder
;
}
for
(
Extension
extension
:
ExtensionManager
.
getExtensions
()) {
decoder
=
extension
.
createDecoder
(
cacheKey
,
type
);
if
(
decoder
!=
null
) {
ExtensionManager
.
addNewDecoder
(
cacheKey
,
decoder
);
return
decoder
;
}
}
Type
[]
typeArgs
=
new
Type
[
0
];
Class
clazz
;
if
(
type
instanceof
ParameterizedType
) {
ParameterizedType
pType
= (
ParameterizedType
)
type
;
clazz
= (
Class
)
pType
.
getRawType
();
typeArgs
=
pType
.
getActualTypeArguments
();
}
else
{
clazz
= (
Class
)
type
;
}
String
source
=
genSource
(
cacheKey
,
clazz
,
typeArgs
);
if
(
"true"
.
equals
(
System
.
getenv
(
"JSONITER_DEBUG"
))) {
System
.
out
.
println
(
">>> "
+
cacheKey
);
System
.
out
.
println
(
source
);
}
try
{
CtClass
ctClass
=
pool
.
makeClass
(
cacheKey
);
ctClass
.
setInterfaces
(
new
CtClass
[]{
pool
.
get
(
Decoder
.
class
.
getName
())});
CtMethod
staticMethod
=
CtNewMethod
.
make
(
source
,
ctClass
);
ctClass
.
addMethod
(
staticMethod
);
CtMethod
interfaceMethod
=
CtNewMethod
.
make
(
""
+
"public Object decode(com.jsoniter.JsonIterator iter) {"
+
"return decode_(iter);"
+
"}"
,
ctClass
);
ctClass
.
addMethod
(
interfaceMethod
);
decoder
= (
Decoder
)
ctClass
.
toClass
().
newInstance
();
ExtensionManager
.
addNewDecoder
(
cacheKey
,
decoder
);
return
decoder
;
}
catch
(
Exception
e
) {
System
.
err
.
println
(
"failed to generate decoder for: "
+
type
+
" with "
+
Arrays
.
toString
(
typeArgs
));
System
.
err
.
println
(
source
);
throw
new
JsonException
(
e
);
}
}
private
static
String
genSource
(
String
cacheKey
,
Class
clazz
,
Type
[]
typeArgs
) {
if
(
CodegenImplNative
.
NATIVE_READS
.
containsKey
(
clazz
.
getName
())) {
return
CodegenImplNative
.
genNative
(
clazz
.
getName
());
}
if
(
clazz
.
isArray
()) {
return
CodegenImplArray
.
genArray
(
clazz
);
}
if
(
Map
.
class
.
isAssignableFrom
(
clazz
)) {
return
CodegenImplMap
.
genMap
(
clazz
,
typeArgs
);
}
if
(
Collection
.
class
.
isAssignableFrom
(
clazz
)) {
return
CodegenImplArray
.
genCollection
(
clazz
,
typeArgs
);
}
ClassDescriptor
desc
=
ExtensionManager
.
getClassDescriptor
(
clazz
,
false
);
List
<
Binding
>
allBindings
=
desc
.
allDecoderBindings
();
for
(
Binding
binding
:
allBindings
) {
if
(
binding
.
failOnMissing
||
binding
.
failOnPresent
) {
// only slice support mandatory tracking
return
CodegenImplObject
.
genObjectUsingSlice
(
clazz
,
cacheKey
,
desc
);
}
}
if
(
desc
.
failOnUnknownFields
) {
// only slice support unknown field tracking
return
CodegenImplObject
.
genObjectUsingSlice
(
clazz
,
cacheKey
,
desc
);
}
if
(
allBindings
.
isEmpty
()) {
return
CodegenImplObject
.
genObjectUsingSkip
(
clazz
,
desc
.
ctor
);
}
if
(
strictMode
) {
return
CodegenImplObject
.
genObjectUsingSlice
(
clazz
,
cacheKey
,
desc
);
}
return
CodegenImplObject
.
genObjectUsingHash
(
clazz
,
cacheKey
,
desc
);
}
}
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