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Codegen.java
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162 lines (148 loc) · 5.89 KB
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package com.jsoniter.output;
import com.jsoniter.DecodingMode;
import com.jsoniter.JsonException;
import com.jsoniter.ReflectionDecoderFactory;
import com.jsoniter.spi.Decoder;
import com.jsoniter.spi.Encoder;
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.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;
class Codegen {
private static EncodingMode mode = EncodingMode.DYNAMIC_MODE;
static boolean isDoingStaticCodegen;
// only read/write when generating code with synchronized protection
private final static Set<String> generatedClassNames = new HashSet<String>();
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 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;
}
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;
}
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);
}
}
String source = genSource(clazz, typeArgs);
if ("true".equals(System.getenv("JSONITER_DEBUG"))) {
System.out.println(">>> " + cacheKey);
System.out.println(source);
}
try {
generatedClassNames.add(cacheKey);
if (isDoingStaticCodegen) {
staticGen(clazz, cacheKey, source);
} else {
encoder = DynamicCodegen.gen(clazz, cacheKey, source);
}
JsoniterSpi.addNewEncoder(cacheKey, encoder);
return encoder;
} catch (Exception e) {
System.err.println("failed to generate encoder for: " + type + " with " + Arrays.toString(typeArgs));
System.err.println(source);
JsoniterSpi.dump();
throw new JsonException(e);
}
}
public static boolean canStaticAccess(String cacheKey) {
return generatedClassNames.contains(cacheKey);
}
private static void staticGen(Class clazz, 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(clazz, cacheKey, writer, source);
} finally {
writer.close();
}
} finally {
fileOutputStream.close();
}
}
private static void staticGen(Class clazz, 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.Encoder {\n");
writer.write(source);
writer.write("public void encode(java.lang.Object obj, com.jsoniter.output.JsonStream stream) throws java.io.IOException {\n");
writer.write(String.format("encode_((%s)obj, stream);\n", clazz.getCanonicalName()));
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);
}
return CodegenImplObject.genObject(clazz);
}
public static void staticGenEncoders(TypeLiteral[] typeLiterals) {
isDoingStaticCodegen = true;
for (TypeLiteral typeLiteral : typeLiterals) {
gen(typeLiteral.getEncoderCacheKey(), typeLiteral.getType());
}
}
}