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Codegen.java
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package com.jsoniter.output;
import com.jsoniter.spi.JsonException;
import com.jsoniter.spi.Encoder;
import com.jsoniter.spi.Extension;
import com.jsoniter.spi.JsoniterSpi;
import com.jsoniter.spi.TypeLiteral;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;
class Codegen {
static EncodingMode mode = EncodingMode.REFLECTION_MODE;
static boolean isDoingStaticCodegen;
// only read/write when generating code with synchronized protection
private final static Map<String, CodegenResult> generatedSources = new HashMap<String, CodegenResult>();
private volatile static Map<String, Encoder> reflectionEncoders = new HashMap<String, Encoder>();
static {
String envMode = System.getenv("JSONITER_ENCODING_MODE");
if (envMode != null) {
mode = EncodingMode.valueOf(envMode);
}
}
public static void setMode(EncodingMode mode) {
Codegen.mode = mode;
}
public static Encoder getReflectionEncoder(String cacheKey, Type type) {
Encoder encoder = CodegenImplNative.NATIVE_ENCODERS.get(type);
if (encoder != null) {
return encoder;
}
encoder = reflectionEncoders.get(cacheKey);
if (encoder != null) {
return encoder;
}
synchronized (Codegen.class) {
encoder = reflectionEncoders.get(cacheKey);
if (encoder != null) {
return encoder;
}
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;
}
encoder = ReflectionEncoderFactory.create(clazz, typeArgs);
HashMap<String, Encoder> copy = new HashMap<String, Encoder>(reflectionEncoders);
copy.put(cacheKey, encoder);
reflectionEncoders = copy;
return encoder;
}
}
public static Encoder getEncoder(String cacheKey, Type type) {
Encoder encoder = JsoniterSpi.getEncoder(cacheKey);
if (encoder != null) {
return encoder;
}
return gen(cacheKey, type);
}
private static synchronized Encoder gen(String cacheKey, Type type) {
Encoder encoder = JsoniterSpi.getEncoder(cacheKey);
if (encoder != null) {
return encoder;
}
List<Extension> extensions = JsoniterSpi.getExtensions();
for (Extension extension : extensions) {
encoder = extension.createEncoder(cacheKey, type);
if (encoder != null) {
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
}
}
encoder = CodegenImplNative.NATIVE_ENCODERS.get(type);
if (encoder != null) {
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
}
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;
}
if (mode == EncodingMode.REFLECTION_MODE) {
encoder = ReflectionEncoderFactory.create(clazz, typeArgs);
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
}
if (!isDoingStaticCodegen) {
try {
encoder = (Encoder) Class.forName(cacheKey).newInstance();
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
} catch (Exception e) {
if (mode == EncodingMode.STATIC_MODE) {
throw new JsonException("static gen should provide the encoder we need, but failed to create the encoder", e);
}
}
}
clazz = chooseAccessibleSuper(clazz);
CodegenResult source = genSource(cacheKey, clazz, typeArgs);
try {
generatedSources.put(cacheKey, source);
if (isDoingStaticCodegen) {
staticGen(clazz, cacheKey, source);
} else {
encoder = DynamicCodegen.gen(clazz, cacheKey, source);
}
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
} catch (Exception e) {
String msg = "failed to generate encoder for: " + type + " with " + Arrays.toString(typeArgs) + ", exception: " + e;
msg = msg + "\n" + source;
throw new JsonException(msg, e);
}
}
private static Class chooseAccessibleSuper(Class clazz) {
if (Modifier.isPublic(clazz.getModifiers())) {
return clazz;
}
return chooseAccessibleSuper(clazz.getSuperclass());
}
public static CodegenResult getGeneratedSource(String cacheKey) {
return generatedSources.get(cacheKey);
}
private static void staticGen(Class clazz, String cacheKey, CodegenResult source) throws IOException {
createDir(cacheKey);
String fileName = cacheKey.replace('.', '/') + ".java";
FileOutputStream fileOutputStream = new FileOutputStream(fileName);
try {
OutputStreamWriter writer = new OutputStreamWriter(fileOutputStream);
try {
staticGen(clazz, cacheKey, writer, source);
} finally {
writer.close();
}
} finally {
fileOutputStream.close();
}
}
private static void staticGen(Class clazz, String cacheKey, OutputStreamWriter writer, CodegenResult 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 + " extends com.jsoniter.spi.EmptyEncoder {\n");
writer.write(source.generateWrapperCode(clazz));
writer.write(source.toString());
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 CodegenResult genSource(String cacheKey, Class clazz, Type[] typeArgs) {
if (clazz.isArray()) {
return CodegenImplArray.genArray(cacheKey, clazz);
}
if (Map.class.isAssignableFrom(clazz)) {
return CodegenImplMap.genMap(cacheKey, clazz, typeArgs);
}
if (Collection.class.isAssignableFrom(clazz)) {
return CodegenImplArray.genCollection(cacheKey, clazz, typeArgs);
}
if (clazz.isEnum()) {
return CodegenImplNative.genEnum(clazz);
}
return CodegenImplObject.genObject(clazz);
}
public static void staticGenEncoders(TypeLiteral[] typeLiterals) {
isDoingStaticCodegen = true;
for (TypeLiteral typeLiteral : typeLiterals) {
gen(typeLiteral.getEncoderCacheKey(), typeLiteral.getType());
}
}
}