66 lines
2.4 KiB
Java
66 lines
2.4 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.dictionarypack;
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import java.io.File;
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/**
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* Immutable class to hold the address of an asset.
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* As opposed to a normal file, an asset is usually represented as a contiguous byte array in
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* the package file. Open it correctly thus requires the name of the package it is in, but
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* also the offset in the file and the length of this data. This class encapsulates these three.
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*/
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final class AssetFileAddress {
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public final String mFilename;
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public final long mOffset;
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public final long mLength;
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public AssetFileAddress(final String filename, final long offset, final long length) {
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mFilename = filename;
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mOffset = offset;
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mLength = length;
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}
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/**
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* Makes an AssetFileAddress. This may return null.
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*
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* @param filename the filename.
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* @return the address, or null if the file does not exist or the parameters are not valid.
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*/
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public static AssetFileAddress makeFromFileName(final String filename) {
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if (null == filename) return null;
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final File f = new File(filename);
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if (!f.isFile()) return null;
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return new AssetFileAddress(filename, 0l, f.length());
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}
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/**
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* Makes an AssetFileAddress. This may return null.
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*
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* @param filename the filename.
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* @param offset the offset.
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* @param length the length.
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* @return the address, or null if the file does not exist or the parameters are not valid.
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*/
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public static AssetFileAddress makeFromFileNameAndOffset(final String filename,
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final long offset, final long length) {
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if (null == filename) return null;
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final File f = new File(filename);
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if (!f.isFile()) return null;
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return new AssetFileAddress(filename, offset, length);
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}
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}
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