Add constructors with var args/Lists

For classes that have a setter for a List<T> field,
create Constructors that take List<T> and var args of T.

Issue #686

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/CompositeItemProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2019 the original author or authors.
+ * Copyright 2006-2022 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.
@@ -21,6 +21,7 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -38,6 +39,33 @@ public class CompositeItemProcessor<I, O> implements ItemProcessor<I, O>, Initia
 
 	private List<? extends ItemProcessor<?, ?>> delegates;
 
+	/**
+	 * Default constrcutor
+	 */
+	public CompositeItemProcessor() {
+
+	}
+
+	/**
+	 * Convenience constructor for setting the delegates.
+	 *
+	 * @param delegates array of {@link ItemProcessor} delegates that will work on the
+	 * item.
+	 */
+	public CompositeItemProcessor(ItemProcessor<?, ?>... delegates) {
+		this(Arrays.asList(delegates));
+	}
+
+	/**
+	 * Convenience constructor for setting the delegates.
+	 *
+	 * @param delegates list of {@link ItemProcessor} delegates that will work on the
+	 * item.
+	 */
+	public CompositeItemProcessor(List<? extends ItemProcessor<?, ?>> delegates) {
+		setDelegates(delegates);
+	}
+
 	@Nullable
 	@Override
 	@SuppressWarnings("unchecked")

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/CompositeItemStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2019 the original author or authors.
+ * Copyright 2006-2022 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.
@@ -34,6 +34,15 @@ public class CompositeItemStream implements ItemStream {
 
 	private final List<ItemStream> streams = new ArrayList<>();
 
+	/**
+	 * Public setter for the {@link ItemStream}s.
+	 *
+	 * @param streams {@link List} of {@link ItemStream}.
+	 */
+	public void setStreams(List<ItemStream> streams) {
+		this.streams.addAll(streams);
+	}
+
 	/**
 	 * Public setter for the {@link ItemStream}s.
 	 * 
@@ -58,12 +67,30 @@ public class CompositeItemStream implements ItemStream {
 	}
 
 	/**
-	 * 
+	 * Default constrcutor
 	 */
 	public CompositeItemStream() {
 		super();
 	}
 
+	/**
+	 * Convenience constructor for setting the {@link ItemStream}s.
+	 *
+	 * @param streams {@link List} of {@link ItemStream}.
+	 */
+	public CompositeItemStream(List<ItemStream> streams) {
+		setStreams(streams);
+	}
+
+	/**
+	 * Convenience constructor for setting the {@link ItemStream}s.
+	 *
+	 * @param streams array of {@link ItemStream}.
+	 */
+	public CompositeItemStream(ItemStream... streams) {
+		setStreams(streams);
+	}
+
 	/**
 	 * Simple aggregate {@link ExecutionContext} provider for the contributions
 	 * registered under the given key.

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/CompositeItemWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2007 the original author or authors.
+ * Copyright 2006-2022 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.
@@ -24,6 +24,7 @@ import org.springframework.batch.item.ItemWriter;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.util.Assert;
 
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -41,6 +42,31 @@ public class CompositeItemWriter<T> implements ItemStreamWriter<T>, Initializing
 
 	private boolean ignoreItemStream = false;
 
+	/**
+	 * Default constrcutor
+	 */
+	public CompositeItemWriter() {
+
+	}
+
+	/**
+	 * Convenience constructor for setting the delegates.
+	 *
+	 * @param delegates the list of delegates to use.
+	 */
+	public CompositeItemWriter(List<ItemWriter<? super T>> delegates) {
+		setDelegates(delegates);
+	}
+
+	/**
+	 * Convenience constructor for setting the delegates.
+	 *
+	 * @param delegates the array of delegates to use.
+	 */
+	public CompositeItemWriter(ItemWriter<? super T>... delegates) {
+		this(Arrays.asList(delegates));
+	}
+
 	/**
 	 * Establishes the policy whether to call the open, close, or update methods for the
 	 * item writer delegates associated with the CompositeItemWriter.

spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/listener/CompositeRepeatListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2007 the original author or authors.
+ * Copyright 2006-2022 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.
@@ -33,6 +33,40 @@ public class CompositeRepeatListener implements RepeatListener {
 
 	private List<RepeatListener> listeners = new ArrayList<>();
 
+	/**
+	 * Default constrcutor
+	 */
+	public CompositeRepeatListener() {
+
+	}
+
+	/**
+	 * Convenience constructor for setting the {@link RepeatListener}s.
+	 *
+	 * @param listeners {@link List} of RepeatListeners to be used by the CompositeRepeatListener.
+	 */
+	public CompositeRepeatListener(List<RepeatListener> listeners) {
+		setListeners(listeners);
+	}
+
+	/**
+	 * Convenience constructor for setting the {@link RepeatListener}s.
+	 *
+	 * @param listeners array of RepeatListeners to be used by the CompositeRepeatListener.
+	 */
+	public CompositeRepeatListener(RepeatListener... listeners) {
+		setListeners(listeners);
+	}
+
+	/**
+	 * Public setter for the listeners.
+	 *
+	 * @param listeners {@link List} of RepeatListeners to be used by the CompositeRepeatListener.
+	 */
+	public void setListeners(List<RepeatListener> listeners) {
+		this.listeners = listeners;
+	}
+
 	/**
 	 * Public setter for the listeners.
 	 *