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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;
/**
* This class stores the EXIF header in IFDs according to the JPEG specification. It is the result
* produced by {@link ExifReader}.
*
* @see ExifReader
* @see IfdData
*/
public class ExifData {
private final IfdData[] mIfdDatas = new IfdData[IfdId.TYPE_IFD_COUNT];
/**
* Adds IFD data. If IFD data of the same type already exists, it will be replaced by the new
* data.
*/
void addIfdData(IfdData data) {
mIfdDatas[data.getId()] = data;
}
/** Returns the {@link IfdData} object corresponding to a given IFD if it exists or null. */
IfdData getIfdData(int ifdId) {
if (ExifTag.isValidIfd(ifdId)) {
return mIfdDatas[ifdId];
}
return null;
}
/**
* Returns the tag with a given TID in the given IFD if the tag exists. Otherwise returns null.
*/
protected ExifTag getTag(short tag, int ifd) {
IfdData ifdData = mIfdDatas[ifd];
return (ifdData == null) ? null : ifdData.getTag(tag);
}
/**
* Adds the given ExifTag to its default IFD and returns an existing ExifTag with the same TID or
* null if none exist.
*/
ExifTag addTag(ExifTag tag) {
if (tag != null) {
int ifd = tag.getIfd();
return addTag(tag, ifd);
}
return null;
}
/**
* Adds the given ExifTag to the given IFD and returns an existing ExifTag with the same TID or
* null if none exist.
*/
private ExifTag addTag(ExifTag tag, int ifdId) {
if (tag != null && ExifTag.isValidIfd(ifdId)) {
IfdData ifdData = getOrCreateIfdData(ifdId);
return ifdData.setTag(tag);
}
return null;
}
/**
* Returns the {@link IfdData} object corresponding to a given IFD or generates one if none exist.
*/
private IfdData getOrCreateIfdData(int ifdId) {
IfdData ifdData = mIfdDatas[ifdId];
if (ifdData == null) {
ifdData = new IfdData(ifdId);
mIfdDatas[ifdId] = ifdData;
}
return ifdData;
}
}
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