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      1 package com.android.mail.bitmap;
      2 
      3 import android.content.ContentResolver;
      4 import android.content.Context;
      5 import android.content.res.AssetFileDescriptor;
      6 import android.database.Cursor;
      7 import android.net.Uri;
      8 import android.text.TextUtils;
      9 
     10 import com.android.bitmap.DecodeTask;
     11 import com.android.mail.providers.Attachment;
     12 import com.android.mail.providers.UIProvider;
     13 
     14 import java.io.IOException;
     15 import java.io.InputStream;
     16 
     17 /**
     18  * A request object for image attachment previews.
     19  * <p>
     20  * All requests are the same size to promote bitmap reuse.
     21  */
     22 public class ImageAttachmentRequest implements DecodeTask.Request {
     23     private final Context mContext;
     24     private final String mLookupUri;
     25     private final int mRendition;
     26     public final int mDestW;
     27 
     28     public ImageAttachmentRequest(final Context context, final String lookupUri,
     29             final int rendition, final int destW) {
     30         mContext = context;
     31         mLookupUri = lookupUri;
     32         mRendition = rendition;
     33         mDestW = destW;
     34     }
     35 
     36     @Override
     37     public boolean equals(Object o) {
     38         if (o == null || !(o instanceof ImageAttachmentRequest)) {
     39             return false;
     40         }
     41         final ImageAttachmentRequest other = (ImageAttachmentRequest) o;
     42         return TextUtils.equals(mLookupUri, other.mLookupUri) && mRendition == other.mRendition
     43                 && mDestW == other.mDestW;
     44     }
     45 
     46     @Override
     47     public int hashCode() {
     48         int hash = 17;
     49         hash += 31 * hash + mLookupUri.hashCode();
     50         hash += 31 * hash + mRendition;
     51         hash += 31 * hash + mDestW;
     52         return hash;
     53     }
     54 
     55     @Override
     56     public String toString() {
     57         final StringBuilder sb = new StringBuilder("[");
     58         sb.append(super.toString());
     59         sb.append(" uri=");
     60         sb.append(mLookupUri);
     61         sb.append(" rendition=");
     62         sb.append(mRendition);
     63         sb.append(" w=");
     64         sb.append(mDestW);
     65         sb.append("]");
     66         return sb.toString();
     67     }
     68 
     69     /**
     70      * Returns true iff the other request is for the same attachment, and differs only in which
     71      * rendition is being requested.
     72      *
     73      */
     74     public boolean matches(ImageAttachmentRequest other) {
     75         return other != null && TextUtils.equals(mLookupUri, other.mLookupUri)
     76                 && mDestW == other.mDestW;
     77     }
     78 
     79     @Override
     80     public AssetFileDescriptor createFd() throws IOException {
     81         AssetFileDescriptor result = null;
     82         Cursor cursor = null;
     83         final ContentResolver cr = mContext.getContentResolver();
     84         try {
     85             cursor = cr.query(Uri.parse(mLookupUri), UIProvider.ATTACHMENT_PROJECTION, null, null,
     86                     null);
     87             if (cursor != null && cursor.moveToFirst()) {
     88                 final Attachment a = new Attachment(cursor);
     89                 result = cr.openAssetFileDescriptor(a.getUriForRendition(mRendition), "r");
     90             }
     91         } finally {
     92             if (cursor != null) {
     93                 cursor.close();
     94             }
     95         }
     96         return result;
     97     }
     98 
     99     @Override
    100     public InputStream createInputStream() throws IOException {
    101         return null;
    102     }
    103 }
    104