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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.util.*;
class Codegen {
// only read/write when generating code with synchronized protection
private final static Set<String> generatedClassNames = new HashSet<String>();
static boolean isDoingStaticCodegen = false;
static DecodingMode mode = DecodingMode.REFLECTION_MODE;
static {
String envMode = System.getenv("JSONITER_DECODING_MODE");
if (envMode != null) {
mode = DecodingMode.valueOf(envMode);
}
}
public static void setMode(DecodingMode mode) {
Codegen.mode = mode;
}
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;
}
}
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;
}
decoder = CodegenImplNative.NATIVE_DECODERS.get(clazz);
if (decoder != null) {
return decoder;
}
if (mode == DecodingMode.REFLECTION_MODE) {
decoder = ReflectionDecoderFactory.create(clazz, typeArgs);
JsoniterSpi.addNewDecoder(cacheKey, decoder);
return decoder;
}
if (!isDoingStaticCodegen) {
try {
decoder = (Decoder) Class.forName(cacheKey).newInstance();
JsoniterSpi.addNewDecoder(cacheKey, decoder);
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(clazz, typeArgs);
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) {
staticGen(cacheKey, source);
} else {
decoder = DynamicCodegen.gen(cacheKey, source);
}
JsoniterSpi.addNewDecoder(cacheKey, decoder);
return decoder;
} catch (Exception e) {
String msg = "failed to generate decoder for: " + type + " with " + Arrays.toString(typeArgs) + ", exception: " + e;
msg = msg + "\n" + source;
throw new JsonException(msg, e);
}
}
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 {
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 new ParameterizedTypeImpl(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 (keyType != String.class) {
throw new IllegalArgumentException("map key must be String");
}
if (clazz == Map.class) {
clazz = implClazz == null ? HashMap.class : implClazz;
}
return new ParameterizedTypeImpl(new Type[]{keyType, valueType}, null, clazz);
}
if (implClazz != null) {
if (typeArgs.length == 0) {
return implClazz;
} else {
return new ParameterizedTypeImpl(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(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(".");
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(Class clazz, Type[] typeArgs) {
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);
}
if (clazz.isEnum()) {
return CodegenImplEnum.genEnum(clazz);
}
ClassDescriptor desc = JsoniterSpi.getDecodingClassDescriptor(clazz, false);
if (shouldUseStrictMode(desc)) {
return CodegenImplObjectStrict.genObjectUsingStrict(clazz, desc);
} else {
return CodegenImplObjectHash.genObjectUsingHash(clazz, desc);
}
}
private static boolean shouldUseStrictMode(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 (allBindings.isEmpty()) {
return true;
}
return false;
}
public static void staticGenDecoders(TypeLiteral[] typeLiterals) {
isDoingStaticCodegen = true;
for (TypeLiteral typeLiteral : typeLiterals) {
gen(typeLiteral.getDecoderCacheKey(), typeLiteral.getType());
}
}
}
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