/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF 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 org.apache.james.core;
import javax.mail.MessagingException;
import javax.mail.util.SharedFileInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.avalon.framework.activity.Disposable;
/**
* Takes an input stream and creates a repeatable input stream source
* for a MimeMessageWrapper. It does this by completely reading the
* input stream and saving that to a temporary file that should delete on exit,
* or when this object is GC'd.
*
* @see MimeMessageWrapper
*
*
*/
public class MimeMessageInputStreamSource
extends MimeMessageSource
implements Disposable {
/**
* A temporary file used to hold the message stream
*/
File file;
/**
* The full path of the temporary file
*/
String sourceId;
/**
* Construct a new MimeMessageInputStreamSource from an
* <code>InputStream</code> that contains the bytes of a
* MimeMessage.
*
* @param key the prefix for the name of the temp file
* @param in the stream containing the MimeMessage
*
* @throws MessagingException if an error occurs while trying to store
* the stream
*/
public MimeMessageInputStreamSource(String key, InputStream in)
throws MessagingException {
//We want to immediately read this into a temporary file
//Create a temp file and channel the input stream into it
OutputStream fout = null;
try {
file = File.createTempFile(key, ".m64");
fout = new BufferedOutputStream(new FileOutputStream(file));
int b = -1;
while ((b = in.read()) != -1) {
fout.write(b);
}
fout.flush();
sourceId = file.getCanonicalPath();
} catch (IOException ioe) {
// We had an IOException preparing the temporary file, so
// don't just leave it around to garbage collect later.
// It isn't as if we are going to use it after we throw
// the MessagingException.
if (fout != null) try {
fout.close();
fout = null;
} catch (IOException _) {
// Ignored - logging unavailable to log this error.
}
if (file != null) {
file.delete();
file = null;
}
throw new MessagingException("Unable to retrieve the data: " + ioe.getMessage(), ioe);
} finally {
try {
if (fout != null) {
fout.close();
}
} catch (IOException ioe) {
// Ignored - logging unavailable to log this non-fatal error.
}
try {
if (in != null) {
in.close();
}
} catch (IOException ioe) {
// Ignored - logging unavailable to log this non-fatal error.
}
}
}
/**
* Returns the unique identifier of this input stream source
*
* @return the unique identifier for this MimeMessageInputStreamSource
*/
public String getSourceId() {
return sourceId;
}
/**
* Get an input stream to retrieve the data stored in the temporary file
*
* @return a <code>BufferedInputStream</code> containing the data
*/
public synchronized InputStream getInputStream() throws IOException {
return new SharedFileInputStream(file);
}
/**
* Get the size of the temp file
*
* @return the size of the temp file
*
* @throws IOException if an error is encoutered while computing the size of the message
*/
public long getMessageSize() throws IOException {
return file.length();
}
/**
* @see org.apache.avalon.framework.activity.Disposable#dispose()
*/
public void dispose() {
try {
if (file != null && file.exists()) {
file.delete();
}
} catch (Exception e) {
//ignore
}
file = null;
}
/**
* <p>Finalizer that closes and deletes the temp file. Very bad.</p>
* We're leaving this in temporarily, while also establishing a more
* formal mechanism for cleanup through use of the dispose() method.
* @throws Throwable
*
public void finalize() throws Throwable {
dispose();
super.finalize();
}
*/
}