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DynamicCodegen.java
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27 lines (23 loc) · 1.08 KB
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package com.jsoniter.output;
import com.jsoniter.spi.EmptyEncoder;
import com.jsoniter.spi.Encoder;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.CtNewMethod;
class DynamicCodegen {
static ClassPool pool = ClassPool.getDefault();
public static Encoder gen(Class clazz, String cacheKey, String source) throws Exception {
CtClass ctClass = pool.makeClass(cacheKey);
ctClass.setInterfaces(new CtClass[]{pool.get(Encoder.class.getName())});
ctClass.setSuperclass(pool.get(EmptyEncoder.class.getName()));
CtMethod staticMethod = CtNewMethod.make(source, ctClass);
ctClass.addMethod(staticMethod);
CtMethod interfaceMethod = CtNewMethod.make("" +
"public void encode(Object obj, com.jsoniter.output.JsonStream stream) throws java.io.IOException {" +
String.format("return encode_((%s)obj, stream);", clazz.getCanonicalName()) +
"}", ctClass);
ctClass.addMethod(interfaceMethod);
return (Encoder) ctClass.toClass().newInstance();
}
}