修复组合任务在获取子任务信息的过程中，手动停止或删除，没有回调的问题

SFtpComponent/src/main/java/com/arialyy/aria/sftp/AbsSFtpInfoTask.java

@@ -16,6 +16,7 @@
 package com.arialyy.aria.sftp;
 
 import com.arialyy.aria.core.FtpUrlEntity;
+import com.arialyy.aria.core.common.CompleteInfo;
 import com.arialyy.aria.core.loader.IInfoTask;
 import com.arialyy.aria.core.loader.ILoaderVisitor;
 import com.arialyy.aria.core.wrapper.AbsTaskWrapper;
@@ -32,9 +33,10 @@ import java.io.UnsupportedEncodingException;
  */
 public abstract class AbsSFtpInfoTask<WP extends AbsTaskWrapper> implements IInfoTask {
   protected String TAG = CommonUtil.getClassName(this);
-  protected Callback callback;
+  private Callback callback;
   private WP wrapper;
   private SFtpTaskOption option;
+  private boolean isStop = false, isCancel = false;
 
   public AbsSFtpInfoTask(WP wp) {
     this.wrapper = wp;
@@ -44,6 +46,28 @@ public abstract class AbsSFtpInfoTask<WP extends AbsTaskWrapper> implements IInf
   protected abstract void getFileInfo(Session session)
       throws JSchException, UnsupportedEncodingException, SftpException;
 
+  @Override public void stop() {
+    isStop = true;
+  }
+
+  @Override public void cancel() {
+    isCancel = true;
+  }
+
+  protected void handleFail(AriaException e, boolean needRetry) {
+    if (isStop || isCancel){
+      return;
+    }
+    callback.onFail(getWrapper().getEntity(), e, needRetry);
+  }
+
+  protected void onSucceed(CompleteInfo info){
+    if (isStop || isCancel){
+      return;
+    }
+    callback.onSucceed(getWrapper().getKey(), info);
+  }
+
   @Override public void run() {
     try {
       FtpUrlEntity entity = option.getUrlEntity();

SFtpComponent/src/main/java/com/arialyy/aria/sftp/download/SFtpDInfoTask.java

@@ -39,7 +39,7 @@ final class SFtpDInfoTask extends AbsSFtpInfoTask<DTaskWrapper> {
   }
 
   @Override protected void getFileInfo(Session session) throws JSchException,
-      UnsupportedEncodingException, SftpException {
+      UnsupportedEncodingException {
     SFtpTaskOption option = (SFtpTaskOption) getWrapper().getTaskOption();
     ChannelSftp channel = (ChannelSftp) session.openChannel("sftp");
     channel.connect(1000);
@@ -60,10 +60,9 @@ final class SFtpDInfoTask extends AbsSFtpInfoTask<DTaskWrapper> {
       getWrapper().getEntity().setFileSize(attr.getSize());
       CompleteInfo info = new CompleteInfo();
       info.code = 200;
-      callback.onSucceed(getWrapper().getKey(), info);
+      onSucceed(info);
     } else {
-      callback.onFail(getWrapper().getEntity(),
-          new AriaSFTPException(String.format("文件不存在，remotePath：%s", remotePath)), false);
+      handleFail(new AriaSFTPException(String.format("文件不存在，remotePath：%s", remotePath)), false);
     }
     channel.disconnect();
   }

SFtpComponent/src/main/java/com/arialyy/aria/sftp/upload/SFtpUInfoTask.java

@@ -64,6 +64,6 @@ final class SFtpUInfoTask extends AbsSFtpInfoTask<UTaskWrapper> {
     info.code = isComplete ? ISCOMPLETE : 200;
     info.obj = attr;
     channel.disconnect();
-    callback.onSucceed(getWrapper().getKey(), info);
+    onSucceed(info);
   }
 }