/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.lcjian.library.util.cache;
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import java.io.Closeable;
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import java.io.File;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringWriter;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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/** Junk drawer of utility methods. */
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final class Util {
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static final Charset US_ASCII = StandardCharsets.US_ASCII;
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static final Charset UTF_8 = StandardCharsets.UTF_8;
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private Util() {
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}
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static String readFully(Reader reader) throws IOException {
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try {
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StringWriter writer = new StringWriter();
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char[] buffer = new char[1024];
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int count;
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while ((count = reader.read(buffer)) != -1) {
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writer.write(buffer, 0, count);
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}
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return writer.toString();
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} finally {
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reader.close();
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}
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}
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/**
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* Deletes the contents of {@code dir}. Throws an IOException if any file
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* could not be deleted, or if {@code dir} is not a readable directory.
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*/
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static void deleteContents(File dir) throws IOException {
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File[] files = dir.listFiles();
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if (files == null) {
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throw new IOException("not a readable directory: " + dir);
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}
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for (File file : files) {
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if (file.isDirectory()) {
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deleteContents(file);
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}
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if (!file.delete()) {
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throw new IOException("failed to delete file: " + file);
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}
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}
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}
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static void closeQuietly(/*Auto*/Closeable closeable) {
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if (closeable != null) {
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try {
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closeable.close();
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} catch (RuntimeException rethrown) {
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throw rethrown;
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} catch (Exception ignored) {
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}
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}
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}
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}
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