content: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * 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.android.gallery3d.exif;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This class stores all the tags in an IFD.
   *
   * @see ExifData
   * @see ExifTag
   */
  class IfdData {
  
      private final int mIfdId;
      private final Map<Short, ExifTag> mExifTags = new HashMap<Short, ExifTag>();
      private int mOffsetToNextIfd = 0;
      private static final int[] sIfds = {
              IfdId.TYPE_IFD_0, IfdId.TYPE_IFD_1, IfdId.TYPE_IFD_EXIF,
              IfdId.TYPE_IFD_INTEROPERABILITY, IfdId.TYPE_IFD_GPS
      };
      /**
       * Creates an IfdData with given IFD ID.
       *
       * @see IfdId#TYPE_IFD_0
       * @see IfdId#TYPE_IFD_1
       * @see IfdId#TYPE_IFD_EXIF
       * @see IfdId#TYPE_IFD_GPS
       * @see IfdId#TYPE_IFD_INTEROPERABILITY
       */
      IfdData(int ifdId) {
          mIfdId = ifdId;
      }
  
      static protected int[] getIfds() {
          return sIfds;
      }
  
      /**
       * Get a array the contains all {@link ExifTag} in this IFD.
       */
      protected ExifTag[] getAllTags() {
          return mExifTags.values().toArray(new ExifTag[mExifTags.size()]);
      }
  
      /**
       * Gets the ID of this IFD.
       *
       * @see IfdId#TYPE_IFD_0
       * @see IfdId#TYPE_IFD_1
       * @see IfdId#TYPE_IFD_EXIF
       * @see IfdId#TYPE_IFD_GPS
       * @see IfdId#TYPE_IFD_INTEROPERABILITY
       */
      protected int getId() {
          return mIfdId;
      }
  
      /**
       * Gets the {@link ExifTag} with given tag id. Return null if there is no
       * such tag.
       */
      protected ExifTag getTag(short tagId) {
          return mExifTags.get(tagId);
      }
  
      /**
       * Adds or replaces a {@link ExifTag}.
       */
      protected ExifTag setTag(ExifTag tag) {
          tag.setIfd(mIfdId);
          return mExifTags.put(tag.getTagId(), tag);
      }
  
      protected boolean checkCollision(short tagId) {
          return mExifTags.get(tagId) != null;
      }
  
      /**
       * Removes the tag of the given ID
       */
      protected void removeTag(short tagId) {
          mExifTags.remove(tagId);
      }
  
      /**
       * Gets the tags count in the IFD.
       */
      protected int getTagCount() {
          return mExifTags.size();
      }
  
      /**
       * Sets the offset of next IFD.
       */
      protected void setOffsetToNextIfd(int offset) {
          mOffsetToNextIfd = offset;
      }
  
      /**
       * Gets the offset of next IFD.
       */
      protected int getOffsetToNextIfd() {
          return mOffsetToNextIfd;
      }
  
      /**
       * Returns true if all tags in this two IFDs are equal. Note that tags of
       * IFDs offset or thumbnail offset will be ignored.
       */
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (obj instanceof IfdData) {
              IfdData data = (IfdData) obj;
              if (data.getId() == mIfdId && data.getTagCount() == getTagCount()) {
                  ExifTag[] tags = data.getAllTags();
                  for (ExifTag tag : tags) {
                      if (ExifInterface.isOffsetTag(tag.getTagId())) {
                          continue;
                      }
                      ExifTag tag2 = mExifTags.get(tag.getTagId());
                      if (!tag.equals(tag2)) {
                          return false;
                      }
                  }
                  return true;
              }
          }
          return false;
      }
  }
  