GH-2569: Add ChainFileListFilter constructors

* Adding ChainFileListFilter constructors to behave like CompositeFileListFilter

Fixes #2569

Adding constructors in `ChainFileListFilter` matching super, so this class behave 
like `CompositeFileListFilter` when using XML flow configuration.

* Fix import error

* Fix checkstyle

* Fix checkstyle

* Fix checkstyle

* Fix author name case
Remove unnecessary javadoc

* Fix code smell squid:S1155

* Add a simple test case for initializing filters with constructor
Fix code smell squid:S1192

* Add a simple test case for initializing filters with constructor
Fix code smell squid:S1192

* Fix missing import

Author: lrk

spring-integration-file/src/main/java/org/springframework/integration/file/filters/ChainFileListFilter.java

@@ -18,6 +18,7 @@
 
 import java.lang.reflect.Array;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.List;
 
 import org.springframework.util.Assert;
@@ -31,18 +32,27 @@
  *
  * @author Artem Bilan
  * @author Gary Russell
+ * @author Cengis Kocaurlu
  *
  * @since 4.3.7
  *
  */
 public class ChainFileListFilter<F> extends CompositeFileListFilter<F> {
 
+	public ChainFileListFilter() {
+		super();
+	}
+
+	public ChainFileListFilter(Collection<? extends FileListFilter<F>> fileFilters) {
+		super(fileFilters);
+	}
+
 	@Override
 	public List<F> filterFiles(F[] files) {
 		Assert.notNull(files, "'files' should not be null");
 		List<F> leftOver = Arrays.asList(files);
 		for (FileListFilter<F> fileFilter : this.fileFilters) {
-			if (leftOver.size() == 0) {
+			if (leftOver.isEmpty()) {
 				break;
 			}
 			@SuppressWarnings("unchecked")

spring-integration-file/src/test/java/org/springframework/integration/file/filters/ChainFileListFilterIntegrationTests.java

@@ -20,20 +20,24 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.List;
 
 import org.junit.Test;
 
 /**
  * @author Aaron Grant
+ * @author Cengis Kocaurlu
  *
  * @since 4.3.8
  */
 public class ChainFileListFilterIntegrationTests {
 
+	private static final String PATTERN_ANY_TEXT_FILES = "*.txt";
+
 	private File[] noFiles = new File[0];
 
-	private File[] oneFile = new File[] { new MockOldFile("file.txt") };
+	private File[] oneFile = new File[]{new MockOldFile("file.txt")};
 
 	@Test
 	public void singleModifiedFilterNoFiles() throws IOException {
@@ -47,7 +51,7 @@ public void singleModifiedFilterNoFiles() throws IOException {
 	@Test
 	public void singlePatternFilter() throws IOException {
 		try (ChainFileListFilter<File> chain = new ChainFileListFilter<>()) {
-			chain.addFilter(new SimplePatternFileListFilter("*.txt"));
+			chain.addFilter(new SimplePatternFileListFilter(PATTERN_ANY_TEXT_FILES));
 			List<File> result = chain.filterFiles(oneFile);
 			assertEquals(1, result.size());
 		}
@@ -65,7 +69,7 @@ public void singleModifiedFilter() throws IOException {
 	@Test
 	public void patternThenModifiedFilters() throws IOException {
 		try (ChainFileListFilter<File> chain = new ChainFileListFilter<>()) {
-			chain.addFilter(new SimplePatternFileListFilter("*.txt"));
+			chain.addFilter(new SimplePatternFileListFilter(PATTERN_ANY_TEXT_FILES));
 			chain.addFilter(new LastModifiedFileListFilter());
 			List<File> result = chain.filterFiles(oneFile);
 			assertEquals(1, result.size());
@@ -76,7 +80,16 @@ public void patternThenModifiedFilters() throws IOException {
 	public void modifiedThenPatternFilters() throws IOException {
 		try (ChainFileListFilter<File> chain = new ChainFileListFilter<>()) {
 			chain.addFilter(new LastModifiedFileListFilter());
-			chain.addFilter(new SimplePatternFileListFilter("*.txt"));
+			chain.addFilter(new SimplePatternFileListFilter(PATTERN_ANY_TEXT_FILES));
+			List<File> result = chain.filterFiles(oneFile);
+			assertEquals(1, result.size());
+		}
+	}
+
+	//https://github.com/spring-projects/spring-integration/issues/2569
+	@Test
+	public void initializeFilterByConstructor() throws IOException {
+		try (ChainFileListFilter<File> chain = new ChainFileListFilter<>(Arrays.asList(new SimplePatternFileListFilter(PATTERN_ANY_TEXT_FILES)))) {
 			List<File> result = chain.filterFiles(oneFile);
 			assertEquals(1, result.size());
 		}