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/*
* Copyright 2007 the original author or authors.
*
* Licensed 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.mockftpserver.stub.command;
import org.mockftpserver.core.MockFtpServerException;
import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.CommandHandler;
import org.mockftpserver.core.command.InvocationRecord;
import org.mockftpserver.core.session.Session;
import org.mockftpserver.core.util.Assert;
import org.mockftpserver.core.util.AssertFailedException;
import java.io.IOException;
import java.io.InputStream;
/**
* CommandHandler for the RETR command. Returns the contents of the specified file on the
* data connection, along with two replies on the control connection: a reply code of 150 and
* another of 226.
* <p/>
* The <code>file</code> property specifies the pathname for the file whose contents should
* be returned from this command. The file path is relative to the CLASSPATH (using the
* ClassLoader for this class).
* <p/>
* An exception is thrown if the <code>file</code> property has not been set or if the specified
* file does not exist or cannot be read.
* <p/>
* Each invocation record stored by this CommandHandler includes the following data element key/values:
* <ul>
* <li>{@link #PATHNAME_KEY} ("pathname") - the pathname of the file submitted on the invocation (the first command parameter)
* </ul>
*
* @author Chris Mair
* @version $Revision$ - $Date$
*/
public class FileRetrCommandHandler extends AbstractStubDataCommandHandler implements CommandHandler {
public static final String PATHNAME_KEY = "pathname";
static final int BUFFER_SIZE = 512; // package-private for testing
private String file;
/**
* Create new uninitialized instance
*/
public FileRetrCommandHandler() {
}
/**
* Create new instance using the specified file pathname
*
* @param file - the path to the file
* @throws AssertFailedException - if the file is null
*/
public FileRetrCommandHandler(String file) {
setFile(file);
}
/**
* @see org.mockftpserver.stub.command.AbstractStubDataCommandHandler#beforeProcessData(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session, org.mockftpserver.core.command.InvocationRecord)
*/
protected void beforeProcessData(Command command, Session session, InvocationRecord invocationRecord) throws Exception {
Assert.notNull(file, "file");
invocationRecord.set(PATHNAME_KEY, command.getRequiredParameter(0));
}
/**
* @see org.mockftpserver.stub.command.AbstractStubDataCommandHandler#processData(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session, org.mockftpserver.core.command.InvocationRecord)
*/
protected void processData(Command command, Session session, InvocationRecord invocationRecord) {
InputStream inputStream = getClass().getClassLoader().getResourceAsStream(file);
Assert.notNull(inputStream, "InputStream for [" + file + "]");
byte[] buffer = new byte[BUFFER_SIZE];
try {
int numBytes;
while ((numBytes = inputStream.read(buffer)) != -1) {
LOG.trace("Sending " + numBytes + " bytes...");
session.sendData(buffer, numBytes);
}
}
catch (IOException e) {
throw new MockFtpServerException(e);
}
}
/**
* Set the path of the file whose contents should be returned when this command is
* invoked. The path is relative to the CLASSPATH.
*
* @param file - the path to the file
* @throws AssertFailedException - if the file is null
*/
public void setFile(String file) {
Assert.notNull(file, "file");
this.file = file;
}
}
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