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A number of general purpose libraries for Java. Dependencies are kept minimal but Spring framework is considered a base requirement for most libraries.

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/*
 * Copyright 2014 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 com.foreach.common.filemanager.services;

import com.foreach.common.filemanager.business.FileDescriptor;
import com.foreach.common.filemanager.business.FileResource;
import com.foreach.common.filemanager.business.FolderDescriptor;
import com.foreach.common.filemanager.business.FolderResource;
import lombok.Builder;
import lombok.NonNull;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.springframework.integration.ftp.session.FtpRemoteFileTemplate;

import java.io.IOException;

public class SpringIntegrationFtpFileRepository extends AbstractFileRepository
{
	private final FtpRemoteFileTemplate remoteFileTemplate;

	@Builder
	protected SpringIntegrationFtpFileRepository( @NonNull String repositoryId,
	                                              @NonNull FtpRemoteFileTemplate remoteFileTemplate,
	                                              PathGenerator pathGenerator ) {
		super( repositoryId );
		setPathGenerator( pathGenerator );
		this.remoteFileTemplate = remoteFileTemplate;

	}

	@Override
	protected FileResource buildFileResource( FileDescriptor descriptor ) {
		String path = SpringIntegrationFtpFileResource.getPath( descriptor );
		FTPFile file = null;
		if ( remoteFileTemplate.exists( path ) ) {
			file = remoteFileTemplate.executeWithClient( client -> {
				try {
					return client.mdtmFile( path );
				}
				catch ( IOException e ) {
					return null;
				}
			} );
		}
		return new SpringIntegrationFtpFileResource( descriptor, file, remoteFileTemplate );
	}

	@Override
	protected FolderResource buildFolderResource( FolderDescriptor descriptor ) {
		return new SpringIntegrationFtpFolderResource( descriptor, remoteFileTemplate );
	}
}