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/*
* Copyright (C) 2013 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.documentsui;
import android.database.AbstractCursor;
import android.database.Cursor;
import android.os.Bundle;
/**
* Cursor wrapper that adds columns to identify which root a document came from.
*/
public class RootCursorWrapper extends AbstractCursor {
private final String mAuthority;
private final String mRootId;
private final Cursor mCursor;
private final int mCount;
private final String[] mColumnNames;
private final int mAuthorityIndex;
private final int mRootIdIndex;
public static final String COLUMN_AUTHORITY = "android:authority";
public static final String COLUMN_ROOT_ID = "android:rootId";
public RootCursorWrapper(String authority, String rootId, Cursor cursor, int maxCount) {
mAuthority = authority;
mRootId = rootId;
mCursor = cursor;
final int count = cursor.getCount();
if (maxCount > 0 && count > maxCount) {
mCount = maxCount;
} else {
mCount = count;
}
if (cursor.getColumnIndex(COLUMN_AUTHORITY) != -1
|| cursor.getColumnIndex(COLUMN_ROOT_ID) != -1) {
throw new IllegalArgumentException("Cursor contains internal columns!");
}
final String[] before = cursor.getColumnNames();
mColumnNames = new String[before.length + 2];
System.arraycopy(before, 0, mColumnNames, 0, before.length);
mAuthorityIndex = before.length;
mRootIdIndex = before.length + 1;
mColumnNames[mAuthorityIndex] = COLUMN_AUTHORITY;
mColumnNames[mRootIdIndex] = COLUMN_ROOT_ID;
}
@Override
public Bundle getExtras() {
return mCursor.getExtras();
}
@Override
public void close() {
super.close();
mCursor.close();
}
@Override
public boolean onMove(int oldPosition, int newPosition) {
return mCursor.moveToPosition(newPosition);
}
@Override
public String[] getColumnNames() {
return mColumnNames;
}
@Override
public int getCount() {
return mCount;
}
@Override
public double getDouble(int column) {
return mCursor.getDouble(column);
}
@Override
public float getFloat(int column) {
return mCursor.getFloat(column);
}
@Override
public int getInt(int column) {
return mCursor.getInt(column);
}
@Override
public long getLong(int column) {
return mCursor.getLong(column);
}
@Override
public short getShort(int column) {
return mCursor.getShort(column);
}
@Override
public String getString(int column) {
if (column == mAuthorityIndex) {
return mAuthority;
} else if (column == mRootIdIndex) {
return mRootId;
} else {
return mCursor.getString(column);
}
}
@Override
public int getType(int column) {
return mCursor.getType(column);
}
@Override
public boolean isNull(int column) {
return mCursor.isNull(column);
}
}
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