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Allow Subclasses in the CompositeItemReader #4682

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Allow Subclasses in the CompositeItemReader #4682

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12 changes: 6 additions & 6 deletions ...rastructure/src/main/java/org/springframework/batch/item/support/CompositeItemReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,17 +32,17 @@
*/
public class CompositeItemReader<T> implements ItemStreamReader<T> {

private final List<ItemStreamReader<T>> delegates;
private final List<ItemStreamReader<? extends T>> delegates;

private final Iterator<ItemStreamReader<T>> delegatesIterator;
private final Iterator<ItemStreamReader<? extends T>> delegatesIterator;

private ItemStreamReader<T> currentDelegate;
private ItemStreamReader<? extends T> currentDelegate;

/**
* Create a new {@link CompositeItemReader}.
* @param delegates the delegate readers to read data
*/
public CompositeItemReader(List<ItemStreamReader<T>> delegates) {
public CompositeItemReader(List<ItemStreamReader<? extends T>> delegates) {
this.delegates = delegates;
this.delegatesIterator = this.delegates.iterator();
this.currentDelegate = this.delegatesIterator.hasNext() ? this.delegatesIterator.next() : null;
Expand All @@ -52,7 +52,7 @@ public CompositeItemReader(List<ItemStreamReader<T>> delegates) {
// opening resources early for a long time
@Override
public void open(ExecutionContext executionContext) throws ItemStreamException {
for (ItemStreamReader<T> delegate : delegates) {
for (ItemStreamReader<? extends T> delegate : delegates) {
delegate.open(executionContext);
}
}
Expand All @@ -79,7 +79,7 @@ public void update(ExecutionContext executionContext) throws ItemStreamException

@Override
public void close() throws ItemStreamException {
for (ItemStreamReader<T> delegate : delegates) {
for (ItemStreamReader<? extends T> delegate : delegates) {
delegate.close();
}
}
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