Android Open Source - Android-Exif Ifd Data

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 *//w w w.java  2s.c o m
 * 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.ai.exif;

import java.util.HashMap;
import java.util.Map;

/**
 * This class stores all the tags in an IFD.
 * <p>
 * Copy from and com.android.camera.exif
 * 
 * @author leo
 * @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;
  }
}

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