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 /*

  * Copyright (C) 2013 Square, Inc.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package com.squareup.picasso;

 import android.graphics.Bitmap;

 import android.graphics.drawable.Drawable;

 import static com.squareup.picasso.Picasso.LoadedFrom;

 /**

  * Represents an arbitrary listener for image loading.

  * <p/>

  * Objects implementing this class <strong>must</strong> have a working implementation of

  * {@link #equals(Object)} and {@link #hashCode()} for proper storage internally. Instances of this

  * interface will also be compared to determine if view recycling is occurring. It is recommended

  * that you add this interface directly on to a custom view type when using in an adapter to ensure

  * correct recycling behavior.

  */

 public interface Target {

   /**

    * Callback when an image has been successfully loaded.

    * <p/>

    * <strong>Note:</strong> You must not recycle the bitmap.

    */

   void onBitmapLoaded(Bitmap bitmap, LoadedFrom from);

   /** Callback indicating the image could not be successfully loaded. */

   void onBitmapFailed(Drawable errorDrawable);

   /** Callback invoked right before your request is submitted. */

   void onPrepareLoad(Drawable placeHolderDrawable);

 }