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Diffstat (limited to 'photoviewer/src/com/android/ex/photo/adapters/BaseCursorPagerAdapter.java')
-rw-r--r--photoviewer/src/com/android/ex/photo/adapters/BaseCursorPagerAdapter.java259
1 files changed, 0 insertions, 259 deletions
diff --git a/photoviewer/src/com/android/ex/photo/adapters/BaseCursorPagerAdapter.java b/photoviewer/src/com/android/ex/photo/adapters/BaseCursorPagerAdapter.java
deleted file mode 100644
index ae2c92e..0000000
--- a/photoviewer/src/com/android/ex/photo/adapters/BaseCursorPagerAdapter.java
+++ /dev/null
@@ -1,259 +0,0 @@
-/*
- * Copyright (C) 2011 Google Inc.
- * Licensed to 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.ex.photo.adapters;
-
-import android.app.Fragment;
-import android.app.FragmentManager;
-import android.content.Context;
-import android.database.Cursor;
-import android.util.Log;
-import android.util.SparseIntArray;
-import android.view.View;
-
-import com.android.ex.photo.provider.PhotoContract;
-
-import java.util.HashMap;
-
-/**
- * Page adapter for use with an BaseCursorLoader. Unlike other cursor adapters, this has no
- * observers for automatic refresh. Instead, it depends upon external mechanisms to provide
- * the update signal.
- */
-public abstract class BaseCursorPagerAdapter extends BaseFragmentPagerAdapter {
- private static final String TAG = "BaseCursorPagerAdapter";
-
- Context mContext;
- private Cursor mCursor;
- private int mRowIDColumn;
- /** Mapping of row ID to cursor position */
- private SparseIntArray mItemPosition;
- /** Mapping of instantiated object to row ID */
- private final HashMap<Object, Integer> mObjectRowMap = new HashMap<Object, Integer>();
-
- /**
- * Constructor that always enables auto-requery.
- *
- * @param c The cursor from which to get the data.
- * @param context The context
- */
- public BaseCursorPagerAdapter(Context context, FragmentManager fm, Cursor c) {
- super(fm);
- init(context, c);
- }
-
- /**
- * Makes a fragment for the data pointed to by the cursor
- *
- * @param context Interface to application's global information
- * @param cursor The cursor from which to get the data. The cursor is already
- * moved to the correct position.
- * @return the newly created fragment.
- */
- public abstract Fragment getItem(Context context, Cursor cursor, int position);
-
- // TODO: This shouldn't just return null - maybe it needs to wait for a cursor to be supplied?
- // See b/7103023
- @Override
- public Fragment getItem(int position) {
- if (mCursor != null && moveCursorTo(position)) {
- return getItem(mContext, mCursor, position);
- }
- return null;
- }
-
- @Override
- public int getCount() {
- if (mCursor != null) {
- return mCursor.getCount();
- } else {
- return 0;
- }
- }
-
- @Override
- public Object instantiateItem(View container, int position) {
- if (mCursor == null) {
- throw new IllegalStateException("this should only be called when the cursor is valid");
- }
-
- final Integer rowId;
- if (moveCursorTo(position)) {
- rowId = mCursor.getString(mRowIDColumn).hashCode();
- } else {
- rowId = null;
- }
-
- // Create the fragment and bind cursor data
- final Object obj = super.instantiateItem(container, position);
- if (obj != null) {
- mObjectRowMap.put(obj, rowId);
- }
- return obj;
- }
-
- @Override
- public void destroyItem(View container, int position, Object object) {
- mObjectRowMap.remove(object);
-
- super.destroyItem(container, position, object);
- }
-
- @Override
- public int getItemPosition(Object object) {
- final Integer rowId = mObjectRowMap.get(object);
- if (rowId == null || mItemPosition == null) {
- return POSITION_NONE;
- }
-
- final int position = mItemPosition.get(rowId, POSITION_NONE);
- return position;
- }
-
- /**
- * @return true if data is valid
- */
- public boolean isDataValid() {
- return mCursor != null;
- }
-
- /**
- * Returns the cursor.
- */
- public Cursor getCursor() {
- return mCursor;
- }
-
- /**
- * Returns the data item associated with the specified position in the data set.
- */
- public Object getDataItem(int position) {
- if (mCursor != null && moveCursorTo(position)) {
- return mCursor;
- } else {
- return null;
- }
- }
-
- /**
- * Returns the row id associated with the specified position in the list.
- */
- public long getItemId(int position) {
- if (mCursor != null && moveCursorTo(position)) {
- return mCursor.getString(mRowIDColumn).hashCode();
- } else {
- return 0;
- }
- }
-
- /**
- * Swap in a new Cursor, returning the old Cursor.
- *
- * @param newCursor The new cursor to be used.
- * @return Returns the previously set Cursor, or null if there was not one.
- * If the given new Cursor is the same instance is the previously set
- * Cursor, null is also returned.
- */
- public Cursor swapCursor(Cursor newCursor) {
- if (Log.isLoggable(TAG, Log.VERBOSE)) {
- Log.v(TAG, "swapCursor old=" + (mCursor == null ? -1 : mCursor.getCount()) +
- "; new=" + (newCursor == null ? -1 : newCursor.getCount()));
- }
-
- if (newCursor == mCursor) {
- return null;
- }
- Cursor oldCursor = mCursor;
- mCursor = newCursor;
- if (newCursor != null) {
- mRowIDColumn = newCursor.getColumnIndex(PhotoContract.PhotoViewColumns.URI);
- } else {
- mRowIDColumn = -1;
- }
-
- setItemPosition();
- notifyDataSetChanged(); // notify the observers about the new cursor
- return oldCursor;
- }
-
- /**
- * Converts the cursor into a CharSequence. Subclasses should override this
- * method to convert their results. The default implementation returns an
- * empty String for null values or the default String representation of
- * the value.
- *
- * @param cursor the cursor to convert to a CharSequence
- * @return a CharSequence representing the value
- */
- public CharSequence convertToString(Cursor cursor) {
- return cursor == null ? "" : cursor.toString();
- }
-
- @Override
- protected String makeFragmentName(int viewId, int index) {
- if (moveCursorTo(index)) {
- return "android:pager:" + viewId + ":" + mCursor.getString(mRowIDColumn).hashCode();
- } else {
- return super.makeFragmentName(viewId, index);
- }
- }
-
- /**
- * Moves the cursor to the given position
- *
- * @return {@code true} if the cursor's position was set. Otherwise, {@code false}.
- */
- private boolean moveCursorTo(int position) {
- if (mCursor != null && !mCursor.isClosed()) {
- return mCursor.moveToPosition(position);
- }
- return false;
- }
-
- /**
- * Initialize the adapter.
- */
- private void init(Context context, Cursor c) {
- boolean cursorPresent = c != null;
- mCursor = c;
- mContext = context;
- mRowIDColumn = cursorPresent
- ? mCursor.getColumnIndex(PhotoContract.PhotoViewColumns.URI) : -1;
- }
-
- /**
- * Sets the {@link #mItemPosition} instance variable with the current mapping of
- * row id to cursor position.
- */
- private void setItemPosition() {
- if (mCursor == null || mCursor.isClosed()) {
- mItemPosition = null;
- return;
- }
-
- SparseIntArray itemPosition = new SparseIntArray(mCursor.getCount());
-
- mCursor.moveToPosition(-1);
- while (mCursor.moveToNext()) {
- final int rowId = mCursor.getString(mRowIDColumn).hashCode();
- final int position = mCursor.getPosition();
-
- itemPosition.append(rowId, position);
- }
- mItemPosition = itemPosition;
- }
-}
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