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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.dialer.callcomposer.camera.exif;
     18 
     19 import java.util.HashMap;
     20 import java.util.Map;
     21 import java.util.Objects;
     22 
     23 /**
     24  * This class stores all the tags in an IFD.
     25  *
     26  * @see ExifData
     27  * @see ExifTag
     28  */
     29 class IfdData {
     30 
     31   private final int mIfdId;
     32   private final Map<Short, ExifTag> mExifTags = new HashMap<>();
     33   private static final int[] sIfds = {
     34     IfdId.TYPE_IFD_0,
     35     IfdId.TYPE_IFD_1,
     36     IfdId.TYPE_IFD_EXIF,
     37     IfdId.TYPE_IFD_INTEROPERABILITY,
     38     IfdId.TYPE_IFD_GPS
     39   };
     40   /**
     41    * Creates an IfdData with given IFD ID.
     42    *
     43    * @see IfdId#TYPE_IFD_0
     44    * @see IfdId#TYPE_IFD_1
     45    * @see IfdId#TYPE_IFD_EXIF
     46    * @see IfdId#TYPE_IFD_GPS
     47    * @see IfdId#TYPE_IFD_INTEROPERABILITY
     48    */
     49   IfdData(int ifdId) {
     50     mIfdId = ifdId;
     51   }
     52 
     53   static int[] getIfds() {
     54     return sIfds;
     55   }
     56 
     57   /** Get a array the contains all {@link ExifTag} in this IFD. */
     58   private ExifTag[] getAllTags() {
     59     return mExifTags.values().toArray(new ExifTag[mExifTags.size()]);
     60   }
     61 
     62   /**
     63    * Gets the ID of this IFD.
     64    *
     65    * @see IfdId#TYPE_IFD_0
     66    * @see IfdId#TYPE_IFD_1
     67    * @see IfdId#TYPE_IFD_EXIF
     68    * @see IfdId#TYPE_IFD_GPS
     69    * @see IfdId#TYPE_IFD_INTEROPERABILITY
     70    */
     71   protected int getId() {
     72     return mIfdId;
     73   }
     74 
     75   /** Gets the {@link ExifTag} with given tag id. Return null if there is no such tag. */
     76   protected ExifTag getTag(short tagId) {
     77     return mExifTags.get(tagId);
     78   }
     79 
     80   /** Adds or replaces a {@link ExifTag}. */
     81   protected ExifTag setTag(ExifTag tag) {
     82     tag.setIfd(mIfdId);
     83     return mExifTags.put(tag.getTagId(), tag);
     84   }
     85 
     86   /** Gets the tags count in the IFD. */
     87   private int getTagCount() {
     88     return mExifTags.size();
     89   }
     90 
     91   /**
     92    * Returns true if all tags in this two IFDs are equal. Note that tags of IFDs offset or thumbnail
     93    * offset will be ignored.
     94    */
     95   @Override
     96   public boolean equals(Object obj) {
     97     if (this == obj) {
     98       return true;
     99     }
    100     if (obj == null) {
    101       return false;
    102     }
    103     if (obj instanceof IfdData) {
    104       IfdData data = (IfdData) obj;
    105       if (data.getId() == mIfdId && data.getTagCount() == getTagCount()) {
    106         ExifTag[] tags = data.getAllTags();
    107         for (ExifTag tag : tags) {
    108           if (ExifInterface.isOffsetTag(tag.getTagId())) {
    109             continue;
    110           }
    111           ExifTag tag2 = mExifTags.get(tag.getTagId());
    112           if (!tag.equals(tag2)) {
    113             return false;
    114           }
    115         }
    116         return true;
    117       }
    118     }
    119     return false;
    120   }
    121 
    122   @Override
    123   public int hashCode() {
    124     return Objects.hash(mIfdId, mExifTags);
    125   }
    126 }
    127