Michael Jurka
153 lines
3.9 KiB
Java
153 lines
3.9 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.gallery3d.exif;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* This class stores all the tags in an IFD.
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*
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* @see ExifData
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* @see ExifTag
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*/
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class IfdData {
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private final int mIfdId;
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private final Map<Short, ExifTag> mExifTags = new HashMap<Short, ExifTag>();
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private int mOffsetToNextIfd = 0;
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private static final int[] sIfds = {
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IfdId.TYPE_IFD_0, IfdId.TYPE_IFD_1, IfdId.TYPE_IFD_EXIF,
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IfdId.TYPE_IFD_INTEROPERABILITY, IfdId.TYPE_IFD_GPS
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};
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/**
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* Creates an IfdData with given IFD ID.
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*
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* @see IfdId#TYPE_IFD_0
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* @see IfdId#TYPE_IFD_1
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* @see IfdId#TYPE_IFD_EXIF
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* @see IfdId#TYPE_IFD_GPS
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* @see IfdId#TYPE_IFD_INTEROPERABILITY
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*/
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IfdData(int ifdId) {
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mIfdId = ifdId;
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}
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static protected int[] getIfds() {
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return sIfds;
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}
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/**
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* Get a array the contains all {@link ExifTag} in this IFD.
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*/
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protected ExifTag[] getAllTags() {
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return mExifTags.values().toArray(new ExifTag[mExifTags.size()]);
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}
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/**
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* Gets the ID of this IFD.
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*
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* @see IfdId#TYPE_IFD_0
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* @see IfdId#TYPE_IFD_1
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* @see IfdId#TYPE_IFD_EXIF
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* @see IfdId#TYPE_IFD_GPS
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* @see IfdId#TYPE_IFD_INTEROPERABILITY
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*/
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protected int getId() {
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return mIfdId;
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}
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/**
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* Gets the {@link ExifTag} with given tag id. Return null if there is no
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* such tag.
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*/
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protected ExifTag getTag(short tagId) {
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return mExifTags.get(tagId);
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}
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/**
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* Adds or replaces a {@link ExifTag}.
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*/
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protected ExifTag setTag(ExifTag tag) {
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tag.setIfd(mIfdId);
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return mExifTags.put(tag.getTagId(), tag);
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}
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protected boolean checkCollision(short tagId) {
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return mExifTags.get(tagId) != null;
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}
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/**
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* Removes the tag of the given ID
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*/
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protected void removeTag(short tagId) {
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mExifTags.remove(tagId);
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}
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/**
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* Gets the tags count in the IFD.
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*/
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protected int getTagCount() {
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return mExifTags.size();
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}
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/**
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* Sets the offset of next IFD.
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*/
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protected void setOffsetToNextIfd(int offset) {
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mOffsetToNextIfd = offset;
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}
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/**
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* Gets the offset of next IFD.
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*/
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protected int getOffsetToNextIfd() {
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return mOffsetToNextIfd;
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}
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/**
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* Returns true if all tags in this two IFDs are equal. Note that tags of
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* IFDs offset or thumbnail offset will be ignored.
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*/
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null) {
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return false;
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}
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if (obj instanceof IfdData) {
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IfdData data = (IfdData) obj;
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if (data.getId() == mIfdId && data.getTagCount() == getTagCount()) {
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ExifTag[] tags = data.getAllTags();
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for (ExifTag tag : tags) {
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if (ExifInterface.isOffsetTag(tag.getTagId())) {
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continue;
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}
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ExifTag tag2 = mExifTags.get(tag.getTagId());
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if (!tag.equals(tag2)) {
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return false;
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}
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}
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return true;
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}
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}
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return false;
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}
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}
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