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278 lines
10 KiB
278 lines
10 KiB
/*
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* Copyright (C) 2016 AriaLyy(https://github.com/AriaLyy/Aria)
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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 com.arialyy.compiler;
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import com.arialyy.annotations.Download;
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import com.arialyy.annotations.Upload;
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import com.squareup.javapoet.ClassName;
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import com.squareup.javapoet.FieldSpec;
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import com.squareup.javapoet.JavaFile;
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import com.squareup.javapoet.MethodSpec;
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import com.squareup.javapoet.ParameterSpec;
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import com.squareup.javapoet.TypeSpec;
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import com.squareup.javapoet.ParameterizedTypeName;
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import java.io.IOException;
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import java.lang.annotation.Annotation;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import javax.annotation.processing.Filer;
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import javax.annotation.processing.RoundEnvironment;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.ElementKind;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.Modifier;
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import javax.lang.model.element.PackageElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.element.VariableElement;
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import javax.lang.model.util.Elements;
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/**
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* Created by lyy on 2017/6/6.
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* 元素处理
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*/
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class ElementHandle {
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private Filer mFiler;
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private Elements mElementUtil;
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private Map<String, ProxyEntity> mMethods = new HashMap<>();
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ElementHandle(Filer filer, Elements elements) {
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mFiler = filer;
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mElementUtil = elements;
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}
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/**
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* VariableElement 一般代表成员变量
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* ExecutableElement 一般代表类中的方法
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* TypeElement 一般代表代表类
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* PackageElement 一般代表Package
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*/
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void handleDownload(RoundEnvironment roundEnv) {
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saveMethod(true, roundEnv, Download.onNoSupportBreakPoint.class);
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saveMethod(true, roundEnv, Download.onPre.class);
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saveMethod(true, roundEnv, Download.onTaskCancel.class);
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saveMethod(true, roundEnv, Download.onTaskComplete.class);
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saveMethod(true, roundEnv, Download.onTaskFail.class);
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saveMethod(true, roundEnv, Download.onTaskPre.class);
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saveMethod(true, roundEnv, Download.onTaskResume.class);
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saveMethod(true, roundEnv, Download.onTaskRunning.class);
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saveMethod(true, roundEnv, Download.onTaskStart.class);
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saveMethod(true, roundEnv, Download.onTaskStop.class);
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}
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void handleUpload(RoundEnvironment roundEnv) {
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saveMethod(false, roundEnv, Upload.onNoSupportBreakPoint.class);
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saveMethod(false, roundEnv, Upload.onPre.class);
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saveMethod(false, roundEnv, Upload.onTaskCancel.class);
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saveMethod(false, roundEnv, Upload.onTaskComplete.class);
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saveMethod(false, roundEnv, Upload.onTaskFail.class);
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saveMethod(false, roundEnv, Upload.onTaskPre.class);
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//saveMethod(false, roundEnv, Upload.onTaskResume.class);
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saveMethod(false, roundEnv, Upload.onTaskRunning.class);
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saveMethod(false, roundEnv, Upload.onTaskStart.class);
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saveMethod(false, roundEnv, Upload.onTaskStop.class);
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}
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void printMethods() {
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//Set<String> keys = mMethods.keySet();
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//for (String key : keys) {
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// ProxyEntity entity = mMethods.get(key);
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// for (String method : entity.methods) {
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// PrintLog.getInstance().info(method);
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// }
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//}
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PrintLog.getInstance().info("size ==> " + mMethods.size());
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}
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/**
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* 在build文件夹中生成如下代码的文件
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* <pre>
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* <code>
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* package com.arialyy.simple.download;
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*
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* import com.arialyy.aria.core.download.DownloadTask;
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* import com.arialyy.aria.core.scheduler.AbsSchedulerListener;
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*
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* public final class SingleTaskActivity$$DownloadListenerProxy extends
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* AbsSchedulerListener<DownloadTask> {
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* private SingleTaskActivity obj;
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*
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* public void onPre(final DownloadTask task) {
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* obj.onPre((DownloadTask)task);
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* }
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*
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* public void onTaskStart(final DownloadTask task) {
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* obj.onStart((DownloadTask)task);
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* }
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*
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* public void setListener(final SingleTaskActivity obj) {
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* this.obj = obj;
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* }
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* }
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* </code>
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* </pre>
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*/
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void createProxyFile() {
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Set<String> keys = mMethods.keySet();
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try {
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for (String key : keys) {
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ProxyEntity entity = mMethods.get(key);
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JavaFile jf = JavaFile.builder(entity.packageName, createProxyClass(entity)).build();
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jf.writeTo(mFiler);
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// 如果需要在控制台打印生成的文件,则去掉下面的注释
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//jf.writeTo(System.out);
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* 创建代理方法
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*
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* @param isDownload 是否是下载的注解
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* @param annotation {@link Download}、{@link Upload}
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* @param methodName 被代理类注解的方法名
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*/
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private MethodSpec createProxyMethod(boolean isDownload, Class<? extends Annotation> annotation,
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String methodName) {
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ClassName task = ClassName.get(
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isDownload ? "com.arialyy.aria.core.download" : "com.arialyy.aria.core.upload",
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isDownload ? "DownloadTask" : "UploadTask");
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ParameterSpec parameterSpec =
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ParameterSpec.builder(task, "task").addModifiers(Modifier.FINAL).build();
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return MethodSpec.methodBuilder(annotation.getSimpleName())
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.addModifiers(Modifier.PUBLIC)
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.returns(void.class)
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.addParameter(parameterSpec)
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.addAnnotation(Override.class)
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.addCode("obj."
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+ methodName
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+ "("
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+ (isDownload ? "(DownloadTask)" : "(UploadTask)")
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+ "task);\n")
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.build();
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}
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/**
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* 创建代理类
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*/
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private TypeSpec createProxyClass(ProxyEntity entity) {
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TypeSpec.Builder builder = TypeSpec.classBuilder(
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entity.className + (entity.isDownlaod ? ProxyConstance.DOWNLOAD_PROXY_CLASS_SUFFIX
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: ProxyConstance.UPLOAD_PROXY_CLASS_SUFFIX))
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.addModifiers(Modifier.PUBLIC, Modifier.FINAL);
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//添加被代理的类的字段
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ClassName obj = ClassName.get(entity.packageName, entity.className);
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FieldSpec observerField = FieldSpec.builder(obj, "obj").addModifiers(Modifier.PRIVATE).build();
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builder.addField(observerField);
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//添加注解方法
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for (Class<? extends Annotation> annotation : entity.methods.keySet()) {
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MethodSpec method =
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createProxyMethod(entity.isDownlaod, annotation, entity.methods.get(annotation));
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builder.addMethod(method);
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}
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//添加设置代理的类
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ParameterSpec parameterSpec =
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ParameterSpec.builder(obj, "obj").addModifiers(Modifier.FINAL).build();
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MethodSpec listener = MethodSpec.methodBuilder(ProxyConstance.SET_LISTENER)
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.addModifiers(Modifier.PUBLIC)
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.returns(void.class)
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.addParameter(parameterSpec)
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.addCode("this.obj = obj;\n")
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.build();
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builder.addJavadoc("该文件为Aria自动生成的代理文件,请不要修改该文件的任何代码!\n");
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//创建父类参数
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ClassName superClass = ClassName.get("com.arialyy.aria.core.scheduler", "AbsSchedulerListener");
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//创建泛型
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ClassName typeVariableName = ClassName.get(
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entity.isDownlaod ? "com.arialyy.aria.core.download" : "com.arialyy.aria.core.upload",
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entity.isDownlaod ? "DownloadTask" : "UploadTask");
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builder.superclass(ParameterizedTypeName.get(superClass, typeVariableName));
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builder.addMethod(listener);
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return builder.build();
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}
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void clean() {
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mMethods.clear();
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}
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/**
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* 查找并保存扫描到的方法
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*/
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private void saveMethod(boolean isDownload, RoundEnvironment roundEnv,
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Class<? extends Annotation> annotationClazz) {
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for (Element element : roundEnv.getElementsAnnotatedWith(annotationClazz)) {
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ElementKind kind = element.getKind();
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if (kind == ElementKind.METHOD) {
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ExecutableElement method = (ExecutableElement) element;
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TypeElement classElement = (TypeElement) method.getEnclosingElement();
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PackageElement packageElement = mElementUtil.getPackageOf(classElement);
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checkDownloadMethod(isDownload, method);
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String methodName = method.getSimpleName().toString();
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String className = method.getEnclosingElement().toString(); //全类名
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ProxyEntity proxyEntity = mMethods.get(className);
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if (proxyEntity == null) {
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proxyEntity = new ProxyEntity();
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proxyEntity.isDownlaod = isDownload;
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//proxyEntity.packageName = classElement.getQualifiedName().toString();
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proxyEntity.packageName = packageElement.getQualifiedName().toString();
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proxyEntity.className = classElement.getSimpleName().toString();
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mMethods.put(className, proxyEntity);
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}
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proxyEntity.methods.put(annotationClazz, methodName);
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}
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}
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}
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/**
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* 检查和下载相关的方法,如果被注解的方法为private或参数不合法,则抛异常
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*/
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private void checkDownloadMethod(boolean isDownload, ExecutableElement method) {
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String methodName = method.getSimpleName().toString();
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String className = method.getEnclosingElement().toString();
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Set<Modifier> modifiers = method.getModifiers();
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if (modifiers.contains(Modifier.PRIVATE)) {
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throw new IllegalAccessError(className + "." + methodName + "不能为private方法");
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}
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List<VariableElement> params = (List<VariableElement>) method.getParameters();
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if (params.size() > 1) {
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throw new IllegalArgumentException(
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className + "." + methodName + "参数错误, 参数只有一个,且参数必须是" + getCheckParams(isDownload));
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}
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if (!params.get(0).asType().toString().equals(getCheckParams(isDownload))) {
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throw new IllegalArgumentException(className
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+ "."
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+ methodName
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+ "参数【"
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+ params.get(0).getSimpleName()
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+ "】类型错误,参数必须是"
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+ getCheckParams(isDownload));
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}
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}
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private String getCheckParams(boolean isDownload) {
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return isDownload ? "com.arialyy.aria.core.download.DownloadTask"
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: "com.arialyy.aria.core.upload.UploadTask";
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}
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}
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