用注解实现回调

AriaCompiler/src/main/java/com/arialyy/compiler/ElementHandle.java

@@ -0,0 +1,70 @@
+package com.arialyy.compiler;
+
+import com.arialyy.annotations.Download;
+import java.util.Set;
+import javax.annotation.processing.Filer;
+import javax.annotation.processing.RoundEnvironment;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.Modifier;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.element.TypeParameterElement;
+import javax.lang.model.element.VariableElement;
+import javax.lang.model.type.TypeMirror;
+
+/**
+ * Created by lyy on 2017/6/6.
+ * 元素处理
+ */
+class ElementHandle {
+
+  private Filer mFiler;
+
+  ElementHandle(Filer filer) {
+    mFiler = filer;
+  }
+
+  /**
+   * VariableElement 一般代表成员变量
+   * ExecutableElement 一般代表类中的方法
+   * TypeElement 一般代表代表类
+   * PackageElement 一般代表Package
+   */
+  void handle(RoundEnvironment roundEnv) {
+    handlePre(roundEnv);
+  }
+
+  /**
+   * 处理{@link Download.onTaskPre}注解
+   */
+  private void handlePre(RoundEnvironment roundEnv) {
+    for (Element element : roundEnv.getElementsAnnotatedWith(Download.onPre.class)) {
+      ElementKind kind = element.getKind();
+      if (kind == ElementKind.METHOD) {
+        ExecutableElement method = (ExecutableElement) element;
+        String methodName = method.getSimpleName().toString();
+        String className = method.getEnclosingElement().toString();
+        Set<Modifier> modifiers = method.getModifiers();
+        if (modifiers.contains(Modifier.PRIVATE)){
+          PrintLog.getInstance().info("私有方法");
+        }
+        PrintLog.getInstance().info("注解的方法：" + methodName);
+        PrintLog.getInstance().info("所在类：" + className);
+        for (VariableElement te : method.getParameters()) {
+          TypeMirror paramType = te.asType();
+          PrintLog.getInstance()
+              .info("参数名：" + te.getSimpleName().toString() + "，参数类型：" + paramType.toString());
+        }
+      }
+    }
+  }
+
+  private void handleNoSupportBreakPoint(RoundEnvironment roundEnv) {
+
+  }
+
+  private void handleTaskCancel(RoundEnvironment roundEnv) {
+
+  }
+}