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 package com.android.tradefed.util; 17 18 import java.io.BufferedReader; 19 import java.io.BufferedWriter; 20 import java.io.File; 21 import java.io.FileReader; 22 import java.io.FileWriter; 23 import java.io.IOException; 24 import java.util.HashMap; 25 import java.util.Map; 26 import java.util.Map.Entry; 27 28 /** 29 * A utility class for changing (or adding) items in an Android property file 30 * 31 */ 32 public abstract class PropertyChanger { 33 34 /** 35 * A utility function to change (or add) items in an Android property file 36 * 37 * Properties that are in the original property file will have its value modified. New ones 38 * will be appended. Caller is responsible for properly recycling temporary files, both original 39 * and the modified. 40 * 41 * @param original the original property file 42 * @param properties the properties to change or add 43 * @return path to the new property file 44 */ 45 public static File changeProperties(File original, Map<String, String> properties) 46 throws IOException { 47 Map<String, String> propsToAdd = new HashMap<String, String>(properties); 48 File ret = FileUtil.createTempFile("chg_prop_", ".prop"); 49 BufferedReader br = null; 50 BufferedWriter bw = null; 51 try { 52 br = new BufferedReader(new FileReader(original)); 53 bw = new BufferedWriter(new FileWriter(ret)); 54 String line = null; 55 while ((line = br.readLine()) != null) { 56 int pos = line.indexOf('='); 57 if (pos != -1) { 58 String name = line.substring(0, pos); 59 if (propsToAdd.containsKey(name)) { 60 // modify the line if property needs to be changed 61 line = String.format("%s=%s", name, propsToAdd.get(name)); 62 propsToAdd.remove(name); 63 } 64 } 65 // write line into new property file 66 bw.write(line + '\n'); 67 } 68 // write remaining properties (new ones) 69 for (Entry<String, String> entry : propsToAdd.entrySet()) { 70 bw.write(String.format("%s=%s\n", entry.getKey(), entry.getValue())); 71 } 72 } finally { 73 StreamUtil.close(br); 74 StreamUtil.close(bw); 75 } 76 return ret; 77 } 78 } 79
