406 lines
16 KiB
Java
406 lines
16 KiB
Java
/*
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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.CodeBlock;
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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.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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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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ProxyConstance.DOWNLOAD_TASK_NO_SUPPORT_BREAKPOINT);
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saveMethod(true, roundEnv, Download.onPre.class, ProxyConstance.DOWNLOAD_PRE);
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saveMethod(true, roundEnv, Download.onTaskCancel.class, ProxyConstance.DOWNLOAD_TASK_CANCEL);
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saveMethod(true, roundEnv, Download.onTaskComplete.class,
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ProxyConstance.DOWNLOAD_TASK_COMPLETE);
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saveMethod(true, roundEnv, Download.onTaskFail.class, ProxyConstance.DOWNLOAD_TASK_FAIL);
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saveMethod(true, roundEnv, Download.onTaskPre.class, ProxyConstance.DOWNLOAD_TASK_PRE);
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saveMethod(true, roundEnv, Download.onTaskResume.class, ProxyConstance.DOWNLOAD_TASK_RESUME);
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saveMethod(true, roundEnv, Download.onTaskRunning.class, ProxyConstance.DOWNLOAD_TASK_RUNNING);
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saveMethod(true, roundEnv, Download.onTaskStart.class, ProxyConstance.DOWNLOAD_TASK_START);
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saveMethod(true, roundEnv, Download.onTaskStop.class, ProxyConstance.DOWNLOAD_TASK_STOP);
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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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ProxyConstance.UPLOAD_TASK_NO_SUPPORT_BREAKPOINT);
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saveMethod(false, roundEnv, Upload.onPre.class, ProxyConstance.UPLOAD_PRE);
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saveMethod(false, roundEnv, Upload.onTaskCancel.class, ProxyConstance.UPLOAD_TASK_CANCEL);
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saveMethod(false, roundEnv, Upload.onTaskComplete.class, ProxyConstance.UPLOAD_TASK_COMPLETE);
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saveMethod(false, roundEnv, Upload.onTaskFail.class, ProxyConstance.UPLOAD_TASK_FAIL);
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saveMethod(false, roundEnv, Upload.onTaskPre.class, ProxyConstance.UPLOAD_TASK_PRE);
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//saveMethod(false, roundEnv, Upload.onTaskResume.class);
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saveMethod(false, roundEnv, Upload.onTaskRunning.class, ProxyConstance.UPLOAD_TASK_RUNNING);
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saveMethod(false, roundEnv, Upload.onTaskStart.class, ProxyConstance.UPLOAD_TASK_START);
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saveMethod(false, roundEnv, Upload.onTaskStop.class, ProxyConstance.UPLOAD_TASK_STOP);
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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 Object obj) {
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* this.obj = (SingleTaskActivity)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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StringBuilder sb = new StringBuilder();
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sb.append("Set<String> keys = keyMapping.get(\"")
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.append(methodName)
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.append("\");\n");
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sb.append("if (keys != null) {\n\tif (keys.contains(task.getKey())) {\n")
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.append("\t\tobj.")
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.append(methodName)
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.append("(")
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.append(isDownload ? "(DownloadTask)" : "(UploadTask)")
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.append("task);\n")
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.append("\t}\n} else {\n")
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.append("\tobj.")
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.append(methodName)
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.append("(")
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.append(isDownload ? "(DownloadTask)" : "(UploadTask)")
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.append("task);\n}\n");
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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(sb.toString())
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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url映射表
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FieldSpec mappingField = FieldSpec.builder(
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ParameterizedTypeName.get(ClassName.get(Map.class), ClassName.get(String.class),
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ParameterizedTypeName.get(ClassName.get(Set.class), ClassName.get(String.class))),
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"keyMapping").addModifiers(Modifier.PRIVATE).initializer("new $T()", HashMap.class).build();
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builder.addField(mappingField);
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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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//增加构造函数
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CodeBlock.Builder cb = CodeBlock.builder();
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cb.add("Set<String> set = null;\n");
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for (String methodName : entity.keyMappings.keySet()) {
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Set<String> keys = entity.keyMappings.get(methodName);
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if (keys == null || keys.size() == 0) continue;
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StringBuilder sb = new StringBuilder();
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sb.append("set = new $T();\n");
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for (String key : keys) {
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if (key.isEmpty()) continue;
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sb.append("set.add(\"").append(key).append("\");\n");
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}
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sb.append("keyMapping.put(\"").append(methodName).append("\", ").append("set);\n");
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cb.add(sb.toString(), ClassName.get(HashSet.class));
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}
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MethodSpec structure =
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MethodSpec.constructorBuilder().addModifiers(Modifier.PUBLIC).addCode(cb.build()).build();
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builder.addMethod(structure);
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//添加设置代理的类
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ParameterSpec parameterSpec =
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ParameterSpec.builder(Object.class, "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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.addAnnotation(Override.class)
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.addCode("this.obj = (" + entity.className + ")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, int annotationType) {
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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 = 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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proxyEntity.keyMappings.put(methodName, getValues(method, isDownload, annotationType));
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}
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}
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}
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/**
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* 获取注解的内容
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*/
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private Set<String> getValues(ExecutableElement method, boolean isDownload, int annotationType) {
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String[] keys = null;
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if (isDownload) {
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switch (annotationType) {
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case ProxyConstance.DOWNLOAD_PRE:
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keys = method.getAnnotation(Download.onPre.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_PRE:
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keys = method.getAnnotation(Download.onTaskPre.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_RESUME:
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keys = method.getAnnotation(Download.onTaskResume.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_START:
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keys = method.getAnnotation(Download.onTaskStart.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_RUNNING:
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keys = method.getAnnotation(Download.onTaskRunning.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_STOP:
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keys = method.getAnnotation(Download.onTaskStop.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_COMPLETE:
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keys = method.getAnnotation(Download.onTaskComplete.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_CANCEL:
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keys = method.getAnnotation(Download.onTaskCancel.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_FAIL:
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keys = method.getAnnotation(Download.onTaskFail.class).value();
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break;
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case ProxyConstance.DOWNLOAD_TASK_NO_SUPPORT_BREAKPOINT:
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keys = method.getAnnotation(Download.onNoSupportBreakPoint.class).value();
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break;
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}
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} else {
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switch (annotationType) {
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case ProxyConstance.UPLOAD_PRE:
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keys = method.getAnnotation(Upload.onPre.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_PRE:
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keys = method.getAnnotation(Upload.onTaskPre.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_RESUME:
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//keys = method.getAnnotation(Upload.onTaskResume.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_START:
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keys = method.getAnnotation(Upload.onTaskStart.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_RUNNING:
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keys = method.getAnnotation(Upload.onTaskRunning.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_STOP:
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keys = method.getAnnotation(Upload.onTaskStop.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_COMPLETE:
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keys = method.getAnnotation(Upload.onTaskComplete.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_CANCEL:
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keys = method.getAnnotation(Upload.onTaskCancel.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_FAIL:
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keys = method.getAnnotation(Upload.onTaskFail.class).value();
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break;
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case ProxyConstance.UPLOAD_TASK_NO_SUPPORT_BREAKPOINT:
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keys = method.getAnnotation(Upload.onNoSupportBreakPoint.class).value();
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break;
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}
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}
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return keys == null ? null : convertSet(keys);
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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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/**
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* 字符串数组转set
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*
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* @param keys 注解中查到的key
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*/
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private Set<String> convertSet(final String[] keys) {
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if (keys == null || keys.length == 0) {
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return null;
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}
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if (keys[0].isEmpty()) return null;
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Set<String> set = new HashSet<>();
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Collections.addAll(set, keys);
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return set;
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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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