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 17 package com.android.inputmethod.latin; 18 19 import com.android.inputmethod.latin.common.FileUtils; 20 21 import java.io.File; 22 23 /** 24 * Immutable class to hold the address of an asset. 25 * As opposed to a normal file, an asset is usually represented as a contiguous byte array in 26 * the package file. Open it correctly thus requires the name of the package it is in, but 27 * also the offset in the file and the length of this data. This class encapsulates these three. 28 */ 29 public final class AssetFileAddress { 30 public final String mFilename; 31 public final long mOffset; 32 public final long mLength; 33 34 public AssetFileAddress(final String filename, final long offset, final long length) { 35 mFilename = filename; 36 mOffset = offset; 37 mLength = length; 38 } 39 40 public static AssetFileAddress makeFromFile(final File file) { 41 if (!file.isFile()) return null; 42 return new AssetFileAddress(file.getAbsolutePath(), 0L, file.length()); 43 } 44 45 public static AssetFileAddress makeFromFileName(final String filename) { 46 if (null == filename) return null; 47 return makeFromFile(new File(filename)); 48 } 49 50 public static AssetFileAddress makeFromFileNameAndOffset(final String filename, 51 final long offset, final long length) { 52 if (null == filename) return null; 53 final File f = new File(filename); 54 if (!f.isFile()) return null; 55 return new AssetFileAddress(filename, offset, length); 56 } 57 58 public boolean pointsToPhysicalFile() { 59 return 0 == mOffset; 60 } 61 62 public void deleteUnderlyingFile() { 63 FileUtils.deleteRecursively(new File(mFilename)); 64 } 65 66 @Override 67 public String toString() { 68 return String.format("%s (offset=%d, length=%d)", mFilename, mOffset, mLength); 69 } 70 } 71
