用注解实现回调

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

@@ -0,0 +1,55 @@
+package com.arialyy.compiler;
+
+import javax.annotation.processing.Messager;
+import javax.lang.model.element.Element;
+import javax.tools.Diagnostic;
+
+/**
+ * Created by Aria.Lao on 2017/6/6.
+ */
+
+public class PrintLog {
+
+  private volatile static PrintLog INSTANCE = null;
+  private Messager mMessager;
+
+  public static PrintLog init(Messager msg) {
+    if (INSTANCE == null) {
+      synchronized (PrintLog.class) {
+        INSTANCE = new PrintLog(msg);
+      }
+    }
+    return INSTANCE;
+  }
+
+  public static PrintLog getInstance() {
+    return INSTANCE;
+  }
+
+  private PrintLog() {
+  }
+
+  private PrintLog(Messager msg) {
+    mMessager = msg;
+  }
+
+  public void error(Element e, String msg, Object... args) {
+    mMessager.printMessage(Diagnostic.Kind.ERROR, String.format(msg, args), e);
+  }
+
+  public void error(String msg, Object... args) {
+    mMessager.printMessage(Diagnostic.Kind.ERROR, String.format(msg, args));
+  }
+
+  private void warning(String msg) {
+    mMessager.printMessage(Diagnostic.Kind.WARNING, msg);
+  }
+
+  public void error(String msg) {
+    mMessager.printMessage(Diagnostic.Kind.ERROR, msg);
+  }
+
+  public void info(String str) {
+    mMessager.printMessage(Diagnostic.Kind.NOTE, str);
+  }
+}