java/src/main/java/com/jsoniter/DynamicCodegen.java at master · baowchen/java · GitHub

34 lines (28 loc) · 1.15 KB

package com.jsoniter;

import com.jsoniter.spi.Decoder;

import javassist.*;

class DynamicCodegen {

static ClassPool pool = ClassPool.getDefault();

static {

pool.insertClassPath(new ClassClassPath(Decoder.class));

}

public static Decoder gen(String cacheKey, String source) throws Exception {

Decoder decoder;

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();

return decoder;

}

public static void enableStreamingSupport() throws Exception {

CtClass ctClass = pool.makeClass("com.jsoniter.IterImpl");

ctClass.setSuperclass(pool.get(IterImplForStreaming.class.getName()));

ctClass.toClass();

}

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