Add rotate support in Film Strip

Move the exif related code under src.com.android.camera.exif.
Refactor the member variables under LocalMediaData.java.
Refactor the LocalData to make sure they are immutables for thread safety.

bug:10367037
Change-Id: I0e84bcc0097925b2be749fe016984177a68e0a4d

1 files changed, 152 insertions, 0 deletions

diff --git a/src/com/android/camera/exif/IfdData.java b/src/com/android/camera/exif/IfdData.java
new file mode 100644
index 000000000..132a8ebc5
--- /dev/null
+++ b/src/com/android/camera/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.camera.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;
+    }
+}