Java编程的动态性，第8部分: 用代码生成取代反射 - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-17
| generators for the new class String tname = tclas.getName(); ClassGen cgen = new ClassGen(cname, "java.lang.Object", cname + ".java", Constants.ACC_PUBLIC, new String[] { "IAccess" }); InstructionFactory ifact = new InstructionFactory(cgen); ConstantPoolGen pgen = cgen.getConstantPool(); //. add target object field to class FieldGen fgen = new FieldGen(Constants.ACC_PRIVATE, new ObjectType(tname), "m_target", pgen); cgen.addField(fgen.getField()); int findex = pgen.addFieldref(cname, "m_target", Utility.getSignature(tname)); // create instruction list for default constructor InstructionList ilist = new InstructionList(); ilist.append(InstructionConstants.ALOAD_0); ilist.append(ifact.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL)); ilist.append(InstructionFactory.createReturn(Type.VOID)); // add public default constructor method to class MethodGen mgen = new MethodGen(Constants.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, null, "<init>", cname, ilist, pgen); addMethod(mgen, cgen); // create instruction list for setTarget method ilist = new InstructionList(); ilist.append(InstructionConstants.ALOAD_0); ilist.append(InstructionConstants.ALOAD_1); ilist.append(new CHECKCAST(pgen.addClass(tname))); ilist.append(new PUTFIELD(findex)); ilist.append(InstructionConstants.RETURN); // add public setTarget method mgen = new MethodGen(Constants.ACC_PUBLIC, Type.VOID, new Type[] { Type.OBJECT }, null, "setTarget", cname, ilist, pgen); addMethod(mgen, cgen); // create instruction list for getValue method ilist = new InstructionList(); ilist.append(InstructionConstants.ALOAD_0); ilist.append(new GETFIELD(findex)); ilist.append(ifact.createInvoke(tname, gmeth.getName(), Type.INT, Type.NO_ARGS, Constants.INVOKEVIRTUAL)); ilist.append(InstructionConstants.IRETURN); // add public getValue method mgen = new MethodGen(Constants.ACC_PUBLIC, Type.INT, Type.NO_ARGS, null, "getValue", cname, ilist, pgen); addMethod(mgen, cgen); // create instruction list for setValue method ilist = new InstructionList(); ilist.append(InstructionConstants.ALOAD_0); ilist.append(new GETFIELD(findex)); ilist.append(InstructionConstants.ILOAD_1); ilist.append(ifact.createInvoke(tname, smeth.getName(), Type.VOID, INT_ARGS, Constants.INVOKEVIRTUAL)); ilist.append(InstructionConstants.RETURN); // add public setValue method mgen = new MethodGen(Constants.ACC_PUBLIC, Type.VOID, |
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