Add @FunctionalInterface where appropriate

acktsap · fmbenhassine · commit ed945ca61dfe · 2022-07-20T19:05:36.000+02:00
Resolves #4107
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/JobParametersIncrementer.java b/spring-batch-core/src/main/java/org/springframework/batch/core/JobParametersIncrementer.java
@@ -23,8 +23,10 @@
  * @author Dave Syer
  * @author Lucas Ward
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  * @since 2.0
  */
+@FunctionalInterface
 public interface JobParametersIncrementer {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/JobParametersValidator.java b/spring-batch-core/src/main/java/org/springframework/batch/core/JobParametersValidator.java
@@ -23,8 +23,10 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface JobParametersValidator {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/job/flow/JobExecutionDecider.java b/spring-batch-core/src/main/java/org/springframework/batch/core/job/flow/JobExecutionDecider.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2018 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.
@@ -27,8 +27,10 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  * @since 2.0
  */
+@FunctionalInterface
 public interface JobExecutionDecider {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/launch/JobLauncher.java b/spring-batch-core/src/main/java/org/springframework/batch/core/launch/JobLauncher.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.
@@ -32,8 +32,9 @@
  *
  * @author Lucas Ward
  * @author Dave Syer
+ * @author Taeik Lim
  */
-
+@FunctionalInterface
 public interface JobLauncher {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/partition/PartitionHandler.java b/spring-batch-core/src/main/java/org/springframework/batch/core/partition/PartitionHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2021 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.
@@ -30,8 +30,10 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  * @since 2.0
  */
+@FunctionalInterface
 public interface PartitionHandler {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/partition/support/Partitioner.java b/spring-batch-core/src/main/java/org/springframework/batch/core/partition/support/Partitioner.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.
@@ -27,8 +27,10 @@
  * unique filenames.
  *
  * @author Dave Syer
+ * @author Taeik Lim
  * @since 2.0
  */
+@FunctionalInterface
 public interface Partitioner {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/partition/support/StepExecutionAggregator.java b/spring-batch-core/src/main/java/org/springframework/batch/core/partition/support/StepExecutionAggregator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2009 the original author or authors.
+ * Copyright 2008-2022 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.
@@ -24,9 +24,11 @@
  * partitioned or remote execution.
  *
  * @author Dave Syer
+ * @author Taeik Lim
  * @since 2.1
  *
  */
+@FunctionalInterface
 public interface StepExecutionAggregator {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/step/item/KeyGenerator.java b/spring-batch-core/src/main/java/org/springframework/batch/core/step/item/KeyGenerator.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.
@@ -20,8 +20,10 @@
  * itself cannot be modified to properly override equals.
  *
  * @author Dave Syer
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface KeyGenerator {
 
 	Object getKey(Object item);
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/step/job/JobParametersExtractor.java b/spring-batch-core/src/main/java/org/springframework/batch/core/step/job/JobParametersExtractor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2010 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.
@@ -23,8 +23,10 @@
  * Strategy interface for translating a {@link StepExecution} into {@link JobParameters}.
  *
  * @author Dave Syer
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface JobParametersExtractor {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/step/skip/SkipPolicy.java b/spring-batch-core/src/main/java/org/springframework/batch/core/step/skip/SkipPolicy.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2021 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.
@@ -21,7 +21,9 @@
  * @author Lucas Ward
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  */
+@FunctionalInterface
 public interface SkipPolicy {
 
 	/**
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/step/tasklet/Tasklet.java b/spring-batch-core/src/main/java/org/springframework/batch/core/step/tasklet/Tasklet.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2018 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.
@@ -25,8 +25,10 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface Tasklet {
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemProcessor.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemProcessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2020 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.
@@ -29,9 +29,11 @@
  * @author Robert Kasanicky
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  * @param <I> type of input item
  * @param <O> type of output item
  */
+@FunctionalInterface
 public interface ItemProcessor<I, O> {
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemReader.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2018 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.
@@ -35,8 +35,10 @@
  * @author Dave Syer
  * @author Lucas Ward
  * @author Mahmoud Ben Hassine
+ * @author Taeik Lim
  * @since 1.0
  */
+@FunctionalInterface
 public interface ItemReader<T> {
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemWriter.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemWriter.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.
@@ -35,7 +35,9 @@
  *
  * @author Dave Syer
  * @author Lucas Ward
+ * @author Taeik Lim
  */
+@FunctionalInterface
 public interface ItemWriter<T> {
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/RepeatOperations.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/RepeatOperations.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.
@@ -25,8 +25,10 @@
  * but these should work the same whether they are in a batch or not.
  *
  * @author Dave Syer
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface RepeatOperations {
 
 	/**
diff --git a/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/exception/ExceptionHandler.java b/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/exception/ExceptionHandler.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.
@@ -28,8 +28,10 @@
  *
  * @author Dave Syer
  * @author Robert Kasanicky
+ * @author Taeik Lim
  *
  */
+@FunctionalInterface
 public interface ExceptionHandler {
 
 	/**

Original file line number	Diff line number	Diff line change
`@@ -23,8 +23,10 @@`
`23`	`23`	`*`
`24`	`24`	`* @author Dave Syer`
`25`	`25`	`* @author Mahmoud Ben Hassine`
	`26`	`+ * @author Taeik Lim`
`26`	`27`	`*`
`27`	`28`	`*/`
	`29`	`+@FunctionalInterface`
`28`	`30`	`public interface JobParametersValidator {`
`29`	`31`
`30`	`32`	`/**`
Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`/*`
`2`		`- * Copyright 2008-2009 the original author or authors.`
	`2`	`+ * Copyright 2008-2022 the original author or authors.`
`3`	`3`	`*`
`4`	`4`	`* Licensed under the Apache License, Version 2.0 (the "License");`
`5`	`5`	`* you may not use this file except in compliance with the License.`
`@@ -24,9 +24,11 @@`
`24`	`24`	`* partitioned or remote execution.`
`25`	`25`	`*`
`26`	`26`	`* @author Dave Syer`
	`27`	`+ * @author Taeik Lim`
`27`	`28`	`* @since 2.1`
`28`	`29`	`*`
`29`	`30`	`*/`
	`31`	`+@FunctionalInterface`
`30`	`32`	`public interface StepExecutionAggregator {`
`31`	`33`
`32`	`34`	`/**`
Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`/*`
`2`		`- * Copyright 2006-2007 the original author or authors.`
	`2`	`+ * Copyright 2006-2022 the original author or authors.`
`3`	`3`	`*`
`4`	`4`	`* Licensed under the Apache License, Version 2.0 (the "License");`
`5`	`5`	`* you may not use this file except in compliance with the License.`
`@@ -20,8 +20,10 @@`
`20`	`20`	`* itself cannot be modified to properly override equals.`
`21`	`21`	`*`
`22`	`22`	`* @author Dave Syer`
	`23`	`+ * @author Taeik Lim`
`23`	`24`	`*`
`24`	`25`	`*/`
	`26`	`+@FunctionalInterface`
`25`	`27`	`public interface KeyGenerator {`
`26`	`28`
`27`	`29`	`Object getKey(Object item);`
Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`/*`
`2`		`- * Copyright 2006-2010 the original author or authors.`
	`2`	`+ * Copyright 2006-2022 the original author or authors.`
`3`	`3`	`*`
`4`	`4`	`* Licensed under the Apache License, Version 2.0 (the "License");`
`5`	`5`	`* you may not use this file except in compliance with the License.`
`@@ -23,8 +23,10 @@`
`23`	`23`	`* Strategy interface for translating a {@link StepExecution} into {@link JobParameters}.`
`24`	`24`	`*`
`25`	`25`	`* @author Dave Syer`
	`26`	`+ * @author Taeik Lim`
`26`	`27`	`*`
`27`	`28`	`*/`
	`29`	`+@FunctionalInterface`
`28`	`30`	`public interface JobParametersExtractor {`
`29`	`31`
`30`	`32`	`/**`