125 lines
3.9 KiB
Java
125 lines
3.9 KiB
Java
/*
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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.android.email.mail.store.imap;
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import android.util.Log;
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import com.android.email.FixedLengthInputStream;
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import com.android.emailcommon.Logging;
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import com.android.emailcommon.TempDirectory;
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import com.android.emailcommon.utility.Utility;
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import org.apache.commons.io.IOUtils;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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/**
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* Subclass of {@link ImapString} used for literals backed by a temp file.
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*/
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public class ImapTempFileLiteral extends ImapString {
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/* package for test */ final File mFile;
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/** Size is purely for toString() */
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private final int mSize;
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/* package */ ImapTempFileLiteral(FixedLengthInputStream stream) throws IOException {
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mSize = stream.getLength();
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mFile = File.createTempFile("imap", ".tmp", TempDirectory.getTempDirectory());
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// Unfortunately, we can't really use deleteOnExit(), because temp filenames are random
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// so it'd simply cause a memory leak.
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// deleteOnExit() simply adds filenames to a static list and the list will never shrink.
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// mFile.deleteOnExit();
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OutputStream out = new FileOutputStream(mFile);
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IOUtils.copy(stream, out);
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out.close();
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}
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/**
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* Make sure we delete the temp file.
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*
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* We should always be calling {@link ImapResponse#destroy()}, but it's here as a last resort.
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*/
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@Override
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protected void finalize() throws Throwable {
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try {
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destroy();
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} finally {
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super.finalize();
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}
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}
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@Override
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public InputStream getAsStream() {
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checkNotDestroyed();
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try {
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return new FileInputStream(mFile);
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} catch (FileNotFoundException e) {
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// It's probably possible if we're low on storage and the system clears the cache dir.
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Log.w(Logging.LOG_TAG, "ImapTempFileLiteral: Temp file not found");
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// Return 0 byte stream as a dummy...
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return new ByteArrayInputStream(new byte[0]);
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}
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}
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@Override
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public String getString() {
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checkNotDestroyed();
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try {
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byte[] bytes = IOUtils.toByteArray(getAsStream());
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// Prevent crash from OOM; we've seen this, but only rarely and not reproducibly
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if (bytes.length > ImapResponseParser.LITERAL_KEEP_IN_MEMORY_THRESHOLD) {
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throw new IOException();
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}
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return Utility.fromAscii(bytes);
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} catch (IOException e) {
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Log.w(Logging.LOG_TAG, "ImapTempFileLiteral: Error while reading temp file", e);
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return "";
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}
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}
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@Override
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public void destroy() {
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try {
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if (!isDestroyed() && mFile.exists()) {
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mFile.delete();
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}
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} catch (RuntimeException re) {
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// Just log and ignore.
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Log.w(Logging.LOG_TAG, "Failed to remove temp file: " + re.getMessage());
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}
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super.destroy();
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}
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@Override
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public String toString() {
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return String.format("{%d byte literal(file)}", mSize);
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}
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public boolean tempFileExistsForTest() {
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return mFile.exists();
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}
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}
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