/*
* Copyright 2016-2017 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.springframework.integration.ftp.inbound;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import org.apache.commons.net.ftp.FTPFile;
import org.springframework.integration.file.remote.AbstractFileInfo;
import org.springframework.integration.file.remote.AbstractRemoteFileStreamingMessageSource;
import org.springframework.integration.file.remote.RemoteFileTemplate;
import org.springframework.integration.ftp.filters.FtpPersistentAcceptOnceFileListFilter;
import org.springframework.integration.ftp.session.FtpFileInfo;
import org.springframework.integration.metadata.SimpleMetadataStore;
/**
* Message source for streaming FTP remote file contents.
*
* @author Gary Russell
* @author Artem Bilan
*
* @since 4.3
*
*/
public class FtpStreamingMessageSource extends AbstractRemoteFileStreamingMessageSource<FTPFile> {
/**
* Construct an instance with the supplied template.
* @param template the template.
*/
public FtpStreamingMessageSource(RemoteFileTemplate<FTPFile> template) {
this(template, null);
}
/**
* Construct an instance with the supplied template and comparator.
* Note: the comparator is applied each time the remote directory is listed
* which only occurs when the previous list is exhausted.
* @param template the template.
* @param comparator the comparator.
*/
public FtpStreamingMessageSource(RemoteFileTemplate<FTPFile> template,
Comparator<AbstractFileInfo<FTPFile>> comparator) {
super(template, comparator);
doSetFilter(new FtpPersistentAcceptOnceFileListFilter(new SimpleMetadataStore(), "ftpStreamingMessageSource"));
}
@Override
public String getComponentType() {
return "ftp:inbound-streaming-channel-adapter";
}
@Override
protected List<AbstractFileInfo<FTPFile>> asFileInfoList(Collection<FTPFile> files) {
List<AbstractFileInfo<FTPFile>> canonicalFiles = new ArrayList<AbstractFileInfo<FTPFile>>();
for (FTPFile file : files) {
canonicalFiles.add(new FtpFileInfo(file));
}
return canonicalFiles;
}
}