DatabaseUtilsCompat.java revision 1935ed3af7c6545bc38adfdc6026d87a3249222f
1/* 2 * Copyright (C) 2011 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 17package android.support.v4.database; 18 19import android.text.TextUtils; 20 21/** 22 * Helper for accessing newer features in DatabaseUtils. 23 */ 24public class DatabaseUtilsCompat { 25 26 private DatabaseUtilsCompat() { 27 /* Hide constructor */ 28 } 29 30 /** 31 * Concatenates two SQL WHERE clauses, handling empty or null values. 32 */ 33 public static String concatenateWhere(String a, String b) { 34 if (TextUtils.isEmpty(a)) { 35 return b; 36 } 37 if (TextUtils.isEmpty(b)) { 38 return a; 39 } 40 41 return "(" + a + ") AND (" + b + ")"; 42 } 43 44 /** 45 * Appends one set of selection args to another. This is useful when adding a selection 46 * argument to a user provided set. 47 */ 48 public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) { 49 if (originalValues == null || originalValues.length == 0) { 50 return newValues; 51 } 52 String[] result = new String[originalValues.length + newValues.length ]; 53 System.arraycopy(originalValues, 0, result, 0, originalValues.length); 54 System.arraycopy(newValues, 0, result, originalValues.length, newValues.length); 55 return result; 56 } 57} 58