mirror of
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java: adds JavassistTemplateBuilder
This commit is contained in:
FURUHASHI Sadayuki
parent
0339db57f1
commit
b970b9b9a8
@ -0,0 +1,523 @@
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//
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// MessagePack for Java
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//
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// Copyright (C) 2009-2010 FURUHASHI Sadayuki
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package org.msgpack.template;
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import java.io.IOException;
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import java.lang.reflect.*;
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import java.util.Map;
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import java.util.HashMap;
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import org.msgpack.*;
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import javassist.CannotCompileException;
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import javassist.ClassPool;
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import javassist.CtClass;
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import javassist.CtConstructor;
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import javassist.CtField;
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import javassist.CtMethod;
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import javassist.CtNewConstructor;
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import javassist.CtNewMethod;
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import javassist.LoaderClassPath;
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import javassist.NotFoundException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class JavassistTemplateBuilder extends TemplateBuilder {
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private static JavassistTemplateBuilder instance;
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public synchronized static JavassistTemplateBuilder getInstance() {
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if(instance == null) {
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instance = new JavassistTemplateBuilder();
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}
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return instance;
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}
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private JavassistTemplateBuilder() {
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this.pool = ClassPool.getDefault();
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}
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private static Logger LOG = LoggerFactory
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.getLogger(JavassistTemplateBuilder.class);
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protected ClassPool pool;
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private int seqId = 0;
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CtClass makeCtClass(String className) {
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return pool.makeClass(className);
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}
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CtClass getCtClass(String className) throws NotFoundException {
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return pool.get(className);
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}
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int nextSeqId() {
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return seqId++;
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}
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public static abstract class JavassistTemplate extends AbstractTemplate {
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public Class targetClass;
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public Template[] templates;
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public JavassistTemplate(Class targetClass, Template[] templates) {
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this.targetClass = targetClass;
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this.templates = templates;
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}
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}
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private static abstract class BuildContextBase {
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protected JavassistTemplateBuilder director;
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protected Class<?> origClass;
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protected String origName;
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protected String tmplName;
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protected CtClass tmplCtClass;
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protected abstract void setSuperClass() throws CannotCompileException, NotFoundException;
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protected abstract void buildConstructor() throws CannotCompileException, NotFoundException;
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protected void buildMethodInit() { }
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protected abstract String buildPackMethodBody();
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protected abstract String buildUnpackMethodBody();
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protected abstract String buildConvertMethodBody();
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protected abstract Template buildInstance(Class<?> c) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException;
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public BuildContextBase(JavassistTemplateBuilder director) {
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this.director = director;
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}
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protected Template build(Class<?> targetClass) {
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try {
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reset(targetClass);
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buildClass();
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buildConstructor();
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buildMethodInit();
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buildPackMethod();
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buildUnpackMethod();
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buildConvertMethod();
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return buildInstance(createClass());
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} catch (Exception e) {
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if(this.stringBuilder != null) {
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LOG.error("builder: "+this.stringBuilder.toString());
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}
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throw new MessageTypeException(e);
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}
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}
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protected void reset(Class<?> targetClass) {
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this.origClass = targetClass;
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this.origName = this.origClass.getName();
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this.tmplName = this.origName + "_$$_Template" + director.nextSeqId();
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this.tmplCtClass = director.makeCtClass(this.tmplName);
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}
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protected void buildClass() throws CannotCompileException, NotFoundException {
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setSuperClass();
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this.tmplCtClass.addInterface(
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director.getCtClass(Template.class.getName()));
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}
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protected void buildPackMethod() throws CannotCompileException, NotFoundException {
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String mbody = buildPackMethodBody();
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int mod = javassist.Modifier.PUBLIC;
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CtClass returnType = CtClass.voidType;
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String mname = "pack";
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CtClass[] paramTypes = new CtClass[] {
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director.getCtClass(Packer.class.getName()),
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director.getCtClass(Object.class.getName())
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};
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CtClass[] exceptTypes = new CtClass[] {
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director.getCtClass(IOException.class.getName())
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};
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CtMethod newCtMethod = CtNewMethod.make(
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mod, returnType, mname,
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paramTypes, exceptTypes, mbody,
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this.tmplCtClass);
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this.tmplCtClass.addMethod(newCtMethod);
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}
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protected void buildUnpackMethod() throws CannotCompileException, NotFoundException {
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String mbody = buildUnpackMethodBody();
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int mod = javassist.Modifier.PUBLIC;
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CtClass returnType = director.getCtClass(Object.class.getName());
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String mname = "unpack";
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CtClass[] paramTypes = new CtClass[] {
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director.getCtClass(Unpacker.class.getName()),
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director.getCtClass(Object.class.getName())
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};
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CtClass[] exceptTypes = new CtClass[] {
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director.getCtClass(MessageTypeException.class.getName())
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};
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CtMethod newCtMethod = CtNewMethod.make(
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mod, returnType, mname,
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paramTypes, exceptTypes, mbody,
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this.tmplCtClass);
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this.tmplCtClass.addMethod(newCtMethod);
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}
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protected void buildConvertMethod() throws CannotCompileException, NotFoundException {
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String mbody = buildConvertMethodBody();
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int mod = javassist.Modifier.PUBLIC;
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CtClass returnType = director.getCtClass(Object.class.getName());
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String mname = "convert";
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CtClass[] paramTypes = new CtClass[] {
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director.getCtClass(MessagePackObject.class.getName()),
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director.getCtClass(Object.class.getName())
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};
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CtClass[] exceptTypes = new CtClass[] {
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director.getCtClass(MessageTypeException.class.getName())
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};
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CtMethod newCtMethod = CtNewMethod.make(
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mod, returnType, mname,
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paramTypes, exceptTypes, mbody,
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this.tmplCtClass);
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this.tmplCtClass.addMethod(newCtMethod);
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}
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protected Class<?> createClass() throws CannotCompileException {
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return (Class<?>)this.tmplCtClass.toClass(null, null);
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}
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protected StringBuilder stringBuilder = null;
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protected void resetStringBuilder() {
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this.stringBuilder = new StringBuilder();
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}
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protected void buildString(String str) {
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this.stringBuilder.append(str);
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}
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protected void buildString(String format, Object... args) {
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this.stringBuilder.append(String.format(format, args));
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}
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protected String getBuiltString() {
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return this.stringBuilder.toString();
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}
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}
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private static class BuildContext extends BuildContextBase {
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protected FieldEntry[] entries;
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protected Template[] templates;
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protected int minimumArrayLength;
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public BuildContext(JavassistTemplateBuilder director) {
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super(director);
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}
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public Template buildTemplate(Class<?> targetClass, FieldEntry[] entries, Template[] templates) {
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this.entries = entries;
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this.templates = templates;
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return build(targetClass);
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}
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protected void setSuperClass() throws CannotCompileException, NotFoundException {
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this.tmplCtClass.setSuperclass(
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director.getCtClass(JavassistTemplate.class.getName()));
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}
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protected void buildConstructor() throws CannotCompileException, NotFoundException {
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// Constructor(Class targetClass, Template[] templates)
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CtConstructor newCtCons = CtNewConstructor.make(
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new CtClass[] {
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director.getCtClass(Class.class.getName()),
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director.getCtClass(Template.class.getName()+"[]")
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},
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new CtClass[0],
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this.tmplCtClass);
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this.tmplCtClass.addConstructor(newCtCons);
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}
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protected Template buildInstance(Class<?> c) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
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Constructor<?> cons = c.getConstructor(new Class[] {
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Class.class,
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Template[].class
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});
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Object tmpl = cons.newInstance(new Object[] {
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this.origClass,
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this.templates
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});
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return (Template)tmpl;
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}
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protected void buildMethodInit() {
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this.minimumArrayLength = 0;
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for(int i=0; i < entries.length; i++) {
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FieldEntry e = entries[i];
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if(e.isRequired() || e.isNullable()) {
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this.minimumArrayLength = i+1;
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}
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}
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}
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protected String buildPackMethodBody() {
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resetStringBuilder();
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buildString("{");
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buildString("%s _$$_t = (%s)$2;", this.origName, this.origName);
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buildString("$1.packArray(%d);", entries.length);
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for(int i=0; i < entries.length; i++) {
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FieldEntry e = entries[i];
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if(!e.isAvailable()) {
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buildString("$1.packNil();");
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continue;
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}
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Class<?> type = e.getType();
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if(type.isPrimitive()) {
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buildString("$1.%s(_$$_t.%s);", primitivePackName(type), e.getName());
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} else {
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buildString("if(_$$_t.%s == null) {", e.getName());
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if(!e.isNullable() && !e.isOptional()) {
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buildString("throw new %s();", MessageTypeException.class.getName());
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} else {
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buildString("$1.packNil();");
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}
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buildString("} else {");
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buildString(" this.templates[%d].pack($1, _$$_t.%s);", i, e.getName());
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buildString("}");
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}
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}
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buildString("}");
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return getBuiltString();
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}
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protected String buildUnpackMethodBody() {
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resetStringBuilder();
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buildString("{ ");
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buildString("%s _$$_t;", this.origName);
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buildString("if($2 == null) {");
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buildString(" _$$_t = (%s)this.targetClass.newInstance();", this.origName);
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buildString("} else {");
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buildString(" _$$_t = (%s)$2;", this.origName);
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buildString("}");
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buildString("int length = $1.unpackArray();");
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buildString("if(length < %d) {", this.minimumArrayLength);
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buildString(" throw new %s();", MessageTypeException.class.getName());
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buildString("}");
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int i;
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for(i=0; i < this.minimumArrayLength; i++) {
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FieldEntry e = entries[i];
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if(!e.isAvailable()) {
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buildString("$1.unpackObject();");
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continue;
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}
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buildString("if($1.tryUnpackNull()) {");
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if(e.isRequired()) {
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// Requred + nil => exception
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buildString("throw new %s();", MessageTypeException.class.getName());
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} else if(e.isOptional()) {
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// Optional + nil => keep default value
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} else { // Nullable
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// Nullable + nil => set null
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buildString("_$$_t.%s = null;", e.getName());
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}
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buildString("} else {");
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Class<?> type = e.getType();
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if(type.isPrimitive()) {
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buildString("_$$_t.%s = $1.%s();", e.getName(), primitiveUnpackName(type));
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} else {
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buildString("_$$_t.%s = (%s)this.templates[%d].unpack($1, _$$_t.%s);", e.getName(), e.getJavaTypeName(), i, e.getName());
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}
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buildString("}");
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}
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for(; i < entries.length; i++) {
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buildString("if(length <= %d) { return _$$_t; }", i);
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FieldEntry e = entries[i];
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if(!e.isAvailable()) {
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buildString("$1.unpackObject();");
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continue;
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}
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buildString("if($1.tryUnpackNull()) {");
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buildString("} else {");
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Class<?> type = e.getType();
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if(type.isPrimitive()) {
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buildString("_$$_t.%s = $1.%s();", e.getName(), primitiveUnpackName(type));
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} else {
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buildString("_$$_t.%s = (%s)this.templates[%d].unpack($1, _$$_t.%s);", e.getName(), e.getJavaTypeName(), i, e.getName());
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}
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buildString("}");
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}
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buildString("for(int i=%d; i < length; i++) {", i);
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buildString(" $1.unpackObject();");
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buildString("}");
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buildString("return _$$_t;");
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buildString("}");
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return getBuiltString();
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}
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protected String buildConvertMethodBody() {
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resetStringBuilder();
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buildString("{ ");
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buildString("%s _$$_t;", this.origName);
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buildString("if($2 == null) {");
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buildString(" _$$_t = (%s)this.targetClass.newInstance();", this.origName);
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buildString("} else {");
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buildString(" _$$_t = (%s)$2;", this.origName);
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buildString("}");
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buildString("%s[] array = $1.asArray();", MessagePackObject.class.getName());
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buildString("int length = array.length;");
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buildString("if(length < %d) {", this.minimumArrayLength);
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buildString(" throw new %s();", MessageTypeException.class.getName());
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buildString("}");
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int i;
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for(i=0; i < this.minimumArrayLength; i++) {
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FieldEntry e = entries[i];
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if(!e.isAvailable()) {
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continue;
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}
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buildString("%s obj = array[%d];", MessagePackObject.class.getName(), i);
|
||||||
|
buildString("if(obj.isNil()) {");
|
||||||
|
if(e.isRequired()) {
|
||||||
|
// Requred + nil => exception
|
||||||
|
buildString("throw new %s();", MessageTypeException.class.getName());
|
||||||
|
} else if(e.isOptional()) {
|
||||||
|
// Optional + nil => keep default value
|
||||||
|
} else { // Nullable
|
||||||
|
// Nullable + nil => set null
|
||||||
|
buildString("_$$_t.%s = null;", e.getName());
|
||||||
|
}
|
||||||
|
buildString("} else {");
|
||||||
|
Class<?> type = e.getType();
|
||||||
|
if(type.isPrimitive()) {
|
||||||
|
buildString("_$$_t.%s = obj.%s();", e.getName(), primitiveConvertName(type));
|
||||||
|
} else {
|
||||||
|
buildString("_$$_t.%s = (%s)this.templates[%d].convert(obj, _$$_t.%s);", e.getName(), e.getJavaTypeName(), i, e.getName());
|
||||||
|
}
|
||||||
|
buildString("}");
|
||||||
|
}
|
||||||
|
|
||||||
|
for(; i < entries.length; i++) {
|
||||||
|
buildString("if(length <= %d) { return _$$_t; }", i);
|
||||||
|
|
||||||
|
FieldEntry e = entries[i];
|
||||||
|
if(!e.isAvailable()) {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
buildString("%s obj = array[%d];", MessagePackObject.class.getName(), i);
|
||||||
|
buildString("if(obj.isNil()) {");
|
||||||
|
buildString("} else {");
|
||||||
|
Class<?> type = e.getType();
|
||||||
|
if(type.isPrimitive()) {
|
||||||
|
buildString("_$$_t.%s = $1.%s();", e.getName(), primitiveConvertName(type));
|
||||||
|
} else {
|
||||||
|
buildString("_$$_t.%s = (%s)this.templates[%d].convert(obj, _$$_t.%s);", e.getName(), e.getJavaTypeName(), i, e.getName());
|
||||||
|
}
|
||||||
|
buildString("}");
|
||||||
|
}
|
||||||
|
|
||||||
|
buildString("return _$$_t;");
|
||||||
|
|
||||||
|
buildString("}");
|
||||||
|
return getBuiltString();
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
protected String primitivePackName(Class<?> type) {
|
||||||
|
if(type == boolean.class) {
|
||||||
|
return "packBoolean";
|
||||||
|
} else if(type == byte.class) {
|
||||||
|
return "packByte";
|
||||||
|
} else if(type == short.class) {
|
||||||
|
return "packShort";
|
||||||
|
} else if(type == int.class) {
|
||||||
|
return "packInt";
|
||||||
|
} else if(type == long.class) {
|
||||||
|
return "packLong";
|
||||||
|
} else if(type == float.class) {
|
||||||
|
return "packFloat";
|
||||||
|
} else if(type == double.class) {
|
||||||
|
return "packDouble";
|
||||||
|
}
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
|
||||||
|
protected String primitiveUnpackName(Class<?> type) {
|
||||||
|
if(type == boolean.class) {
|
||||||
|
return "unpackBoolean";
|
||||||
|
} else if(type == byte.class) {
|
||||||
|
return "unpackByte";
|
||||||
|
} else if(type == short.class) {
|
||||||
|
return "unpackShort";
|
||||||
|
} else if(type == int.class) {
|
||||||
|
return "unpackInt";
|
||||||
|
} else if(type == long.class) {
|
||||||
|
return "unpackLong";
|
||||||
|
} else if(type == float.class) {
|
||||||
|
return "unpackFloat";
|
||||||
|
} else if(type == double.class) {
|
||||||
|
return "unpackDouble";
|
||||||
|
}
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
|
||||||
|
protected String primitiveConvertName(Class<?> type) {
|
||||||
|
if(type == boolean.class) {
|
||||||
|
return "asBoolean";
|
||||||
|
} else if(type == byte.class) {
|
||||||
|
return "asByte";
|
||||||
|
} else if(type == short.class) {
|
||||||
|
return "asShort";
|
||||||
|
} else if(type == int.class) {
|
||||||
|
return "asInt";
|
||||||
|
} else if(type == long.class) {
|
||||||
|
return "asLong";
|
||||||
|
} else if(type == float.class) {
|
||||||
|
return "asFloat";
|
||||||
|
} else if(type == double.class) {
|
||||||
|
return "asDouble";
|
||||||
|
}
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public Template buildTemplate(Class<?> targetClass, FieldEntry[] entries) {
|
||||||
|
Template[] tmpls = new Template[entries.length];
|
||||||
|
for(int i=0; i < entries.length; i++) {
|
||||||
|
FieldEntry e = entries[i];
|
||||||
|
Template tmpl = TemplateRegistry.lookup(e.getGenericType(), true);
|
||||||
|
tmpls[i] = tmpl;
|
||||||
|
}
|
||||||
|
|
||||||
|
BuildContext bc = new BuildContext(this);
|
||||||
|
return bc.buildTemplate(targetClass, entries, tmpls);
|
||||||
|
}
|
||||||
|
|
||||||
|
static class JavassistOrdinalEnumTemplate extends ReflectionTemplateBuilder.ReflectionOrdinalEnumTemplate {
|
||||||
|
JavassistOrdinalEnumTemplate(Enum<?>[] entries) {
|
||||||
|
super(entries);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public Template buildOrdinalEnumTemplate(Class<?> targetClass, Enum<?>[] entries) {
|
||||||
|
return new JavassistOrdinalEnumTemplate(entries);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
Loading…
x
Reference in New Issue
Block a user