AbstractItemReader

java.lang.Object
- jakarta.batch.api.chunk.AbstractItemReader

All Implemented Interfaces:

ItemReader
```
public abstract class AbstractItemReader
extends java.lang.Object
implements ItemReader
```
The AbstractItemReader provides default implementations of less commonly implemented methods.

Constructor Summary

Constructors
Constructor and Description

AbstractItemReader()

Constructors
Constructor and Description
`AbstractItemReader()`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`java.io.Serializable`	`checkpointInfo()` Override this method if the ItemReader supports checkpoints.
`void`	`close()` Override this method if the ItemReader requires any close time processing.
`void`	`open(java.io.Serializable checkpoint)` Override this method if the ItemReader requires any open time processing.
`abstract java.lang.Object`	`readItem()` Implement read logic for the ItemReader in this method.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AbstractItemReader
```
public AbstractItemReader()
```
- Method Detail
  - open
```
public void open(java.io.Serializable checkpoint)
          throws java.lang.Exception
```
    Override this method if the ItemReader requires any open time processing. The default implementation does nothing.
    
    Specified by:
    
    open in interface ItemReader
    
    Parameters:
    
    checkpoint - last checkpoint for this ItemReader - may be null.
    
    Throws:
    
    java.lang.Exception - (or subclass) if an error occurs.
  - close
```
public void close()
           throws java.lang.Exception
```
    Override this method if the ItemReader requires any close time processing. The default implementation does nothing.
    
    Specified by:
    
    close in interface ItemReader
    
    Throws:
    
    java.lang.Exception - (or subclass) if an error occurs.
  - readItem
```
public abstract java.lang.Object readItem()
                                   throws java.lang.Exception
```
    Implement read logic for the ItemReader in this method.
    
    Specified by:
    
    readItem in interface ItemReader
    
    Returns:
    
    next item or null
    
    Throws:
    
    java.lang.Exception - (or subclass) if an error occurs.
  - checkpointInfo
```
public java.io.Serializable checkpointInfo()
                                    throws java.lang.Exception
```
    Override this method if the ItemReader supports checkpoints. The default implementation returns null.
    
    Specified by:
    
    checkpointInfo in interface ItemReader
    
    Returns:
    
    checkpoint data
    
    Throws:
    
    java.lang.Exception - (or subclass) if an error occurs.

Class AbstractItemReader

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AbstractItemReader

Method Detail

open

close

readItem

checkpointInfo