/*
* Copyright 2011 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import io.netty.buffer.ChannelBuffer;
import io.netty.buffer.ChannelBuffers;
/**
* Abstract Disk HttpData implementation
*/
public abstract class AbstractDiskHttpData extends AbstractHttpData {
protected File file;
private boolean isRenamed;
private FileChannel fileChannel;
public AbstractDiskHttpData(String name, Charset charset, long size) {
super(name, charset, size);
}
/**
*
* @return the real DiskFilename (basename)
*/
protected abstract String getDiskFilename();
/**
*
* @return the default prefix
*/
protected abstract String getPrefix();
/**
*
* @return the default base Directory
*/
protected abstract String getBaseDirectory();
/**
*
* @return the default postfix
*/
protected abstract String getPostfix();
/**
*
* @return True if the file should be deleted on Exit by default
*/
protected abstract boolean deleteOnExit();
/**
*
* @return a new Temp File from getDiskFilename(), default prefix, postfix and baseDirectory
* @throws IOException
*/
private File tempFile() throws IOException {
String newpostfix = null;
String diskFilename = getDiskFilename();
if (diskFilename != null) {
newpostfix = "_" + diskFilename;
} else {
newpostfix = getPostfix();
}
File tmpFile;
if (getBaseDirectory() == null) {
// create a temporary file
tmpFile = File.createTempFile(getPrefix(), newpostfix);
} else {
tmpFile = File.createTempFile(getPrefix(), newpostfix, new File(
getBaseDirectory()));
}
if (deleteOnExit()) {
tmpFile.deleteOnExit();
}
return tmpFile;
}
@Override
public void setContent(ChannelBuffer buffer) throws IOException {
if (buffer == null) {
throw new NullPointerException("buffer");
}
size = buffer.readableBytes();
if (definedSize > 0 && definedSize < size) {
throw new IOException("Out of size: " + size + " > " + definedSize);
}
if (file == null) {
file = tempFile();
}
if (buffer.readableBytes() == 0) {
// empty file
file.createNewFile();
return;
}
FileOutputStream outputStream = new FileOutputStream(file);
FileChannel localfileChannel = outputStream.getChannel();
ByteBuffer byteBuffer = buffer.toByteBuffer();
int written = 0;
while (written < size) {
written += localfileChannel.write(byteBuffer);
localfileChannel.force(false);
}
buffer.readerIndex(buffer.readerIndex() + written);
localfileChannel.close();
completed = true;
}
@Override
public void addContent(ChannelBuffer buffer, boolean last)
throws IOException {
if (buffer != null) {
int localsize = buffer.readableBytes();
if (definedSize > 0 && definedSize < size + localsize) {
throw new IOException("Out of size: " + (size + localsize) +
" > " + definedSize);
}
ByteBuffer byteBuffer = buffer.toByteBuffer();
int written = 0;
if (file == null) {
file = tempFile();
}
if (fileChannel == null) {
FileOutputStream outputStream = new FileOutputStream(file);
fileChannel = outputStream.getChannel();
}
while (written < localsize) {
written += fileChannel.write(byteBuffer);
fileChannel.force(false);
}
size += localsize;
buffer.readerIndex(buffer.readerIndex() + written);
}
if (last) {
if (file == null) {
file = tempFile();
}
if (fileChannel == null) {
FileOutputStream outputStream = new FileOutputStream(file);
fileChannel = outputStream.getChannel();
}
fileChannel.close();
fileChannel = null;
completed = true;
} else {
if (buffer == null) {
throw new NullPointerException("buffer");
}
}
}
@Override
public void setContent(File file) throws IOException {
if (this.file != null) {
delete();
}
this.file = file;
size = file.length();
isRenamed = true;
completed = true;
}
@Override
public void setContent(InputStream inputStream) throws IOException {
if (inputStream == null) {
throw new NullPointerException("inputStream");
}
if (file != null) {
delete();
}
file = tempFile();
FileOutputStream outputStream = new FileOutputStream(file);
FileChannel localfileChannel = outputStream.getChannel();
byte[] bytes = new byte[4096 * 4];
ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
int read = inputStream.read(bytes);
int written = 0;
while (read > 0) {
byteBuffer.position(read).flip();
written += localfileChannel.write(byteBuffer);
localfileChannel.force(false);
read = inputStream.read(bytes);
}
size = written;
if (definedSize > 0 && definedSize < size) {
file.delete();
file = null;
throw new IOException("Out of size: " + size + " > " + definedSize);
}
isRenamed = true;
completed = true;
}
@Override
public void delete() {
if (! isRenamed) {
if (file != null) {
file.delete();
}
}
}
@Override
public byte[] get() throws IOException {
if (file == null) {
return new byte[0];
}
return readFrom(file);
}
@Override
public ChannelBuffer getChannelBuffer() throws IOException {
if (file == null) {
return ChannelBuffers.EMPTY_BUFFER;
}
byte[] array = readFrom(file);
return ChannelBuffers.wrappedBuffer(array);
}
@Override
public ChannelBuffer getChunk(int length) throws IOException {
if (file == null || length == 0) {
return ChannelBuffers.EMPTY_BUFFER;
}
if (fileChannel == null) {
FileInputStream inputStream = new FileInputStream(file);
fileChannel = inputStream.getChannel();
}
int read = 0;
ByteBuffer byteBuffer = ByteBuffer.allocate(length);
while (read < length) {
int readnow = fileChannel.read(byteBuffer);
if (readnow == -1) {
fileChannel.close();
fileChannel = null;
break;
} else {
read += readnow;
}
}
if (read == 0) {
return ChannelBuffers.EMPTY_BUFFER;
}
byteBuffer.flip();
ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(byteBuffer);
buffer.readerIndex(0);
buffer.writerIndex(read);
return buffer;
}
@Override
public String getString() throws IOException {
return getString(HttpCodecUtil.DEFAULT_CHARSET);
}
@Override
public String getString(Charset encoding) throws IOException {
if (file == null) {
return "";
}
if (encoding == null) {
byte[] array = readFrom(file);
return new String(array, HttpCodecUtil.DEFAULT_CHARSET);
}
byte[] array = readFrom(file);
return new String(array, encoding);
}
@Override
public boolean isInMemory() {
return false;
}
@Override
public boolean renameTo(File dest) throws IOException {
if (dest == null) {
throw new NullPointerException("dest");
}
if (!file.renameTo(dest)) {
// must copy
FileInputStream inputStream = new FileInputStream(file);
FileOutputStream outputStream = new FileOutputStream(dest);
FileChannel in = inputStream.getChannel();
FileChannel out = outputStream.getChannel();
long destsize = in.transferTo(0, size, out);
if (destsize == size) {
file.delete();
file = dest;
isRenamed = true;
return true;
} else {
dest.delete();
return false;
}
}
file = dest;
isRenamed = true;
return true;
}
/**
* Utility function
* @param src
* @return the array of bytes
* @throws IOException
*/
private byte[] readFrom(File src) throws IOException {
long srcsize = src.length();
if (srcsize > Integer.MAX_VALUE) {
throw new IllegalArgumentException(
"File too big to be loaded in memory");
}
FileInputStream inputStream = new FileInputStream(src);
FileChannel fileChannel = inputStream.getChannel();
byte[] array = new byte[(int) srcsize];
ByteBuffer byteBuffer = ByteBuffer.wrap(array);
int read = 0;
while (read < srcsize) {
read += fileChannel.read(byteBuffer);
}
fileChannel.close();
return array;
}
@Override
public File getFile() throws IOException {
return file;
}
}