1 /* 2 * Copyright (C) 2010 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.jakewharton.disklrucache; 18 19 import java.io.Closeable; 20 import java.io.File; 21 import java.io.IOException; 22 import java.io.Reader; 23 import java.io.StringWriter; 24 import java.nio.charset.Charset; 25 26 /** Junk drawer of utility methods. */ 27 final class Util { 28 static final Charset US_ASCII = Charset.forName("US-ASCII"); 29 static final Charset UTF_8 = Charset.forName("UTF-8"); 30 Util()31 private Util() { 32 } 33 readFully(Reader reader)34 static String readFully(Reader reader) throws IOException { 35 try { 36 StringWriter writer = new StringWriter(); 37 char[] buffer = new char[1024]; 38 int count; 39 while ((count = reader.read(buffer)) != -1) { 40 writer.write(buffer, 0, count); 41 } 42 return writer.toString(); 43 } finally { 44 reader.close(); 45 } 46 } 47 48 /** 49 * Deletes the contents of {@code dir}. Throws an IOException if any file 50 * could not be deleted, or if {@code dir} is not a readable directory. 51 */ deleteContents(File dir)52 static void deleteContents(File dir) throws IOException { 53 File[] files = dir.listFiles(); 54 if (files == null) { 55 throw new IOException("not a readable directory: " + dir); 56 } 57 for (File file : files) { 58 if (file.isDirectory()) { 59 deleteContents(file); 60 } 61 if (!file.delete()) { 62 throw new IOException("failed to delete file: " + file); 63 } 64 } 65 } 66 closeQuietly( Closeable closeable)67 static void closeQuietly(/*Auto*/Closeable closeable) { 68 if (closeable != null) { 69 try { 70 closeable.close(); 71 } catch (RuntimeException rethrown) { 72 throw rethrown; 73 } catch (Exception ignored) { 74 } 75 } 76 } 77 } 78