1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.documentsui.roots; 18 19 import android.database.AbstractCursor; 20 import android.database.Cursor; 21 import android.os.Bundle; 22 import android.util.Log; 23 24 import static com.android.documentsui.base.Shared.VERBOSE; 25 26 /** 27 * Cursor wrapper that adds columns to identify which root a document came from. 28 */ 29 public class RootCursorWrapper extends AbstractCursor { 30 private final String mAuthority; 31 private final String mRootId; 32 33 private final Cursor mCursor; 34 private final int mCount; 35 36 private final String[] mColumnNames; 37 38 private final int mAuthorityIndex; 39 private final int mRootIdIndex; 40 41 public static final String COLUMN_AUTHORITY = "android:authority"; 42 public static final String COLUMN_ROOT_ID = "android:rootId"; 43 private static final String TAG = "RootCursorWrapper"; 44 RootCursorWrapper(String authority, String rootId, Cursor cursor, int maxCount)45 public RootCursorWrapper(String authority, String rootId, Cursor cursor, int maxCount) { 46 mAuthority = authority; 47 mRootId = rootId; 48 mCursor = cursor; 49 50 final int count = cursor.getCount(); 51 if (maxCount > 0 && count > maxCount) { 52 mCount = maxCount; 53 } else { 54 mCount = count; 55 } 56 57 if (cursor.getColumnIndex(COLUMN_AUTHORITY) != -1 58 || cursor.getColumnIndex(COLUMN_ROOT_ID) != -1) { 59 throw new IllegalArgumentException("Cursor contains internal columns!"); 60 } 61 final String[] before = cursor.getColumnNames(); 62 mColumnNames = new String[before.length + 2]; 63 System.arraycopy(before, 0, mColumnNames, 0, before.length); 64 mAuthorityIndex = before.length; 65 mRootIdIndex = before.length + 1; 66 mColumnNames[mAuthorityIndex] = COLUMN_AUTHORITY; 67 mColumnNames[mRootIdIndex] = COLUMN_ROOT_ID; 68 } 69 70 @Override getExtras()71 public Bundle getExtras() { 72 Bundle extras = mCursor.getExtras(); 73 74 if (extras == null) { 75 if (VERBOSE) Log.v(TAG, "Cursor for root " + mRootId + " does not have any extras."); 76 return Bundle.EMPTY; 77 } 78 79 return extras; 80 } 81 82 @Override close()83 public void close() { 84 super.close(); 85 mCursor.close(); 86 } 87 88 @Override onMove(int oldPosition, int newPosition)89 public boolean onMove(int oldPosition, int newPosition) { 90 return mCursor.moveToPosition(newPosition); 91 } 92 93 @Override getColumnNames()94 public String[] getColumnNames() { 95 return mColumnNames; 96 } 97 98 @Override getCount()99 public int getCount() { 100 return mCount; 101 } 102 103 @Override getDouble(int column)104 public double getDouble(int column) { 105 return mCursor.getDouble(column); 106 } 107 108 @Override getFloat(int column)109 public float getFloat(int column) { 110 return mCursor.getFloat(column); 111 } 112 113 @Override getInt(int column)114 public int getInt(int column) { 115 return mCursor.getInt(column); 116 } 117 118 @Override getLong(int column)119 public long getLong(int column) { 120 return mCursor.getLong(column); 121 } 122 123 @Override getShort(int column)124 public short getShort(int column) { 125 return mCursor.getShort(column); 126 } 127 128 @Override getString(int column)129 public String getString(int column) { 130 if (column == mAuthorityIndex) { 131 return mAuthority; 132 } else if (column == mRootIdIndex) { 133 return mRootId; 134 } else { 135 return mCursor.getString(column); 136 } 137 } 138 139 @Override getType(int column)140 public int getType(int column) { 141 return mCursor.getType(column); 142 } 143 144 @Override isNull(int column)145 public boolean isNull(int column) { 146 return mCursor.isNull(column); 147 } 148 } 149