org.springframework.batch.item.ldif

Class LdifReader

java.lang.Object

org.springframework.batch.item.ItemStreamSupport

org.springframework.batch.item.support.AbstractItemStreamItemReader<T>

org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader<org.springframework.ldap.core.LdapAttributes>

org.springframework.batch.item.ldif.LdifReader

All Implemented Interfaces:

ResourceAwareItemReaderItemStream<org.springframework.ldap.core.LdapAttributes>, ItemReader<org.springframework.ldap.core.LdapAttributes>, ItemStream, ItemStreamReader<org.springframework.ldap.core.LdapAttributes>, org.springframework.beans.factory.InitializingBean

public class LdifReader
extends AbstractItemCountingItemStreamItemReader<org.springframework.ldap.core.LdapAttributes>
implements ResourceAwareItemReaderItemStream<org.springframework.ldap.core.LdapAttributes>, org.springframework.beans.factory.InitializingBean

The LdifReader is an adaptation of the FlatFileItemReader built around an LdifParser.

Unlike the FlatFileItemReader, the LdifReader does not require a mapper. Instead, this version of the LdifReader simply returns an LdapAttributes object which can be consumed and manipulated as necessary by ItemProcessor or any output service. Alternatively, the RecordMapper interface can be implemented and set in a MappingLdifReader to map records to objects for return.

LdifReader usage is mimics that of the FlatFileItemReader for all intensive purposes. Adjustments have been made to process records instead of lines, however. As such, the recordsToSkip attribute indicates the number of records from the top of the file that should not be processed. Implementations of the RecordCallbackHandler interface can be used to execute operations on those skipped records.

As with the FlatFileItemReader, the strict option differentiates between whether or not to require the resource to exist before processing. In the case of a value set to false, a warning is logged instead of an exception being thrown.

Author:

Keith Barlow

Constructor Summary

Constructors

Constructor and Description
LdifReader()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet()
protected void	doClose() Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().
protected void	doOpen() Open resources necessary to start reading input.
protected org.springframework.ldap.core.LdapAttributes	doRead() Read next item from input.
void	setRecordsToSkip(int recordsToSkip) Public setter for the number of lines to skip at the start of a file.
void	setResource(org.springframework.core.io.Resource resource) Establishes the resource that will be used as the input for the LdifReader.
void	setSkippedRecordsCallback(RecordCallbackHandler skippedRecordsCallback) RecordCallbackHandler implementations can be used to take action on skipped records.
void	setStrict(boolean strict) In strict mode the reader will throw an exception on AbstractItemCountingItemStreamItemReader.open(org.springframework.batch.item.ExecutionContext) if the input resource does not exist.

Methods inherited from class org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader

close, getCurrentItemCount, isSaveState, jumpToItem, open, read, setCurrentItemCount, setMaxItemCount, setSaveState, update

Methods inherited from class org.springframework.batch.item.ItemStreamSupport

getExecutionContextKey, getName, setExecutionContextName, setName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.batch.item.ItemStream

close, open, update

Methods inherited from interface org.springframework.batch.item.ItemReader

read

Constructor Detail

LdifReader

public LdifReader()

Method Detail

setStrict

public void setStrict(boolean strict)

In strict mode the reader will throw an exception on AbstractItemCountingItemStreamItemReader.open(org.springframework.batch.item.ExecutionContext) if the input resource does not exist.

Parameters:

strict - true by default

setSkippedRecordsCallback

public void setSkippedRecordsCallback(RecordCallbackHandler skippedRecordsCallback)

RecordCallbackHandler implementations can be used to take action on skipped records.

Parameters:

skippedRecordsCallback - will be called for each one of the initial skipped lines before any items are read.

setRecordsToSkip

public void setRecordsToSkip(int recordsToSkip)

Public setter for the number of lines to skip at the start of a file. Can be used if the file contains a header without useful (column name) information, and without a comment delimiter at the beginning of the lines.

Parameters:

recordsToSkip - the number of lines to skip

doClose

protected void doClose()
                throws java.lang.Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().

Specified by:

doClose in class AbstractItemCountingItemStreamItemReader<org.springframework.ldap.core.LdapAttributes>

Throws:

java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

doOpen

protected void doOpen()
               throws java.lang.Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Open resources necessary to start reading input.

Specified by:

doOpen in class AbstractItemCountingItemStreamItemReader<org.springframework.ldap.core.LdapAttributes>

Throws:

java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

doRead

@Nullable
protected org.springframework.ldap.core.LdapAttributes doRead()
                                                                 throws java.lang.Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Read next item from input.

Specified by:

doRead in class AbstractItemCountingItemStreamItemReader<org.springframework.ldap.core.LdapAttributes>

Returns:

an item or null if the data source is exhausted

Throws:

java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

setResource

public void setResource(org.springframework.core.io.Resource resource)

Establishes the resource that will be used as the input for the LdifReader.

Specified by:

setResource in interface ResourceAwareItemReaderItemStream<org.springframework.ldap.core.LdapAttributes>

Parameters:

resource - the resource that will be read.

afterPropertiesSet

public void afterPropertiesSet()
                        throws java.lang.Exception

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

Throws:

java.lang.Exception