lottie/src/main/java/com/airbnb/lottie/ImageAssetBitmapManager.java

package com.airbnb.lottie;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import static junit.framework.Assert.assertNotNull;

class ImageAssetBitmapManager {
  private final Context context;
  private String imagesFolder;
  private final Map<String, ImageAsset> imageAssets;
  private final Map<String, Bitmap> bitmaps = new HashMap<>();

  ImageAssetBitmapManager(Drawable.Callback callback, String imagesFolder,
      Map<String, ImageAsset> imageAssets) {
    assertNotNull(callback);

    this.imagesFolder = imagesFolder;
    if (this.imagesFolder.charAt(this.imagesFolder.length() - 1) != '/') {
      this.imagesFolder += '/';
    }

    if (!(callback instanceof View)) {
      Log.w(L.TAG, "LottieDrawable must be inside of a view for images to work.");
      this.imageAssets = new HashMap<>();
      context = null;
      return;
    }

    context = ((View) callback).getContext();
    this.imageAssets = imageAssets;
  }

  Bitmap bitmapForId(String id) {
    Bitmap bitmap = bitmaps.get(id);
    if (bitmap == null) {
      ImageAsset imageAsset = imageAssets.get(id);
      if (imageAsset == null) {
        return null;
      }
      InputStream is;
      try {
        if (TextUtils.isEmpty(imagesFolder)) {
          throw new IllegalStateException("You must set an images folder before loading an image." +
              " Set it with LottieComposition#setImagesFolder or LottieDrawable#setImagesFolder");
        }
        is = context.getAssets().open(imagesFolder + imageAsset.getFileName());
        bitmap = BitmapFactory.decodeStream(is);
        bitmaps.put(id, bitmap);
      } catch (IOException e) {
        Log.w(L.TAG, "Unable to open asset.", e);
      }
    }
    return bitmap;
  }

  void recycleBitmaps() {
    for (String key : bitmaps.keySet()) {
      Bitmap bitmap = bitmaps.remove(key);
      bitmap.recycle();
    }
  }

  boolean hasSameContext(Context context) {
    return context == null && this.context == null ||
        context != null && this.context.equals(context);
  }
}