GH-9869: Introduce AbstractRecentFileListFilter strategy

Fixes: https://github.com/spring-projects/spring-integration/issues/9869

Currently, FileListFilters on the last modified attribute of a file are limited to the use case of discarding files that are too young.
It would be great to have a filter implementation which would accept files which are not old enough.

* Implement `AbstractRecentFileListFilter` for all the supported file protocols

spring-integration-ftp/src/main/java/org/springframework/integration/ftp/filters/FtpRecentFileListFilter.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2025 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
+ *
+ *      https://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.filters;
+
+import java.time.Duration;
+import java.time.Instant;
+
+import org.apache.commons.net.ftp.FTPFile;
+
+import org.springframework.integration.file.filters.AbstractRecentFileListFilter;
+
+/**
+ * The {@link AbstractRecentFileListFilter} implementation for FTP protocol.
+ *
+ * @author Artem Bilan
+ *
+ * @since 6.5
+ */
+public class FtpRecentFileListFilter extends AbstractRecentFileListFilter<FTPFile> {
+
+	public FtpRecentFileListFilter() {
+		super();
+	}
+
+	public FtpRecentFileListFilter(Duration age) {
+		super(age);
+	}
+
+	@Override
+	protected Instant getLastModified(FTPFile remoteFile) {
+		return remoteFile.getTimestampInstant();
+	}
+
+}

spring-integration-ftp/src/test/java/org/springframework/integration/ftp/filters/FtpRecentFileListFilterTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2025 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
+ *
+ *      https://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.filters;
+
+import java.time.Duration;
+import java.util.Calendar;
+
+import org.apache.commons.net.ftp.FTPFile;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Artem Bilan
+ *
+ * @since 6.5
+ */
+public class FtpRecentFileListFilterTests {
+
+	@Test
+	public void testAge() {
+		FtpRecentFileListFilter filter = new FtpRecentFileListFilter(Duration.ofHours(20));
+		FTPFile ftpFile1 = new FTPFile();
+		ftpFile1.setName("foo");
+		ftpFile1.setTimestamp(Calendar.getInstance());
+		FTPFile ftpFile2 = new FTPFile();
+		ftpFile2.setName("bar");
+		ftpFile2.setTimestamp(Calendar.getInstance());
+		FTPFile[] files = new FTPFile[] {ftpFile1, ftpFile2};
+		assertThat(filter.filterFiles(files)).hasSize(2);
+		assertThat(filter.accept(ftpFile1)).isTrue();
+		assertThat(filter.accept(ftpFile2)).isTrue();
+
+		// Make a file as of yesterday's
+		final Calendar calendar = Calendar.getInstance();
+		calendar.add(Calendar.DATE, -1);
+		ftpFile2.setTimestamp(calendar);
+
+		assertThat(filter.filterFiles(files)).hasSize(1);
+		assertThat(filter.accept(ftpFile1)).isTrue();
+	}
+
+}