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/*
* Copyright (C) 2016 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.dialer.callcomposer.camera.exif;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
/**
* 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<>();
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 int[] getIfds() {
return sIfds;
}
/** Get a array the contains all {@link ExifTag} in this IFD. */
private 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);
}
/** Gets the tags count in the IFD. */
private int getTagCount() {
return mExifTags.size();
}
/**
* 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;
}
@Override
public int hashCode() {
return Objects.hash(mIfdId, mExifTags);
}
}
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