diff options
Diffstat (limited to 'WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java')
-rw-r--r-- | WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java b/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java new file mode 100644 index 000000000..093944aec --- /dev/null +++ b/WallpaperPicker/src/com/android/gallery3d/exif/IfdData.java @@ -0,0 +1,152 @@ +/* + * 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; + } +} |