org.springframework.integration.ftp.dsl.FtpStreamingInboundChannelAdapterSpec.java Source code

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Here is the source code for org.springframework.integration.ftp.dsl.FtpStreamingInboundChannelAdapterSpec.java

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/*
 * Copyright 2014-2017 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.dsl;

import java.util.Comparator;

import org.apache.commons.net.ftp.FTPFile;

import org.springframework.integration.file.dsl.RemoteFileStreamingInboundChannelAdapterSpec;
import org.springframework.integration.file.filters.CompositeFileListFilter;
import org.springframework.integration.file.filters.FileListFilter;
import org.springframework.integration.file.remote.AbstractFileInfo;
import org.springframework.integration.file.remote.RemoteFileTemplate;
import org.springframework.integration.ftp.filters.FtpPersistentAcceptOnceFileListFilter;
import org.springframework.integration.ftp.filters.FtpRegexPatternFileListFilter;
import org.springframework.integration.ftp.filters.FtpSimplePatternFileListFilter;
import org.springframework.integration.ftp.inbound.FtpStreamingMessageSource;
import org.springframework.integration.metadata.SimpleMetadataStore;

/**
 * A {@link RemoteFileStreamingInboundChannelAdapterSpec} for a
 * {@link FtpStreamingMessageSource}.
 *
 * @author Gary Russell
 * @since 5.0
 */
public class FtpStreamingInboundChannelAdapterSpec extends
        RemoteFileStreamingInboundChannelAdapterSpec<FTPFile, FtpStreamingInboundChannelAdapterSpec, FtpStreamingMessageSource> {

    FtpStreamingInboundChannelAdapterSpec(RemoteFileTemplate<FTPFile> remoteFileTemplate,
            Comparator<AbstractFileInfo<FTPFile>> comparator) {
        this.target = new FtpStreamingMessageSource(remoteFileTemplate, comparator);
    }

    /**
     * Specify a simple pattern to match remote files (e.g. '*.txt').
     * @param pattern the pattern.
     * @see FtpSimplePatternFileListFilter
     * @see #filter(org.springframework.integration.file.filters.FileListFilter)
     */
    @Override
    public FtpStreamingInboundChannelAdapterSpec patternFilter(String pattern) {
        return filter(composeFilters(new FtpSimplePatternFileListFilter(pattern)));
    }

    /**
     * Specify a regular expression to match remote files (e.g. '[0-9].*.txt').
     * @param regex the expression.
     * @see FtpRegexPatternFileListFilter
     * @see #filter(org.springframework.integration.file.filters.FileListFilter)
     */
    @Override
    public FtpStreamingInboundChannelAdapterSpec regexFilter(String regex) {
        return filter(composeFilters(new FtpRegexPatternFileListFilter(regex)));
    }

    @SuppressWarnings("unchecked")
    private CompositeFileListFilter<FTPFile> composeFilters(FileListFilter<FTPFile> fileListFilter) {
        CompositeFileListFilter<FTPFile> compositeFileListFilter = new CompositeFileListFilter<>();
        compositeFileListFilter.addFilters(fileListFilter,
                new FtpPersistentAcceptOnceFileListFilter(new SimpleMetadataStore(), "ftpStreamingMessageSource"));
        return compositeFileListFilter;
    }

}