Package org.springframework.batch.item.file.builder

Class FlatFileItemReaderBuilder<T>

java.lang.Object

org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder<T>

public class FlatFileItemReaderBuilder<T>
extends Object

A builder implementation for the FlatFileItemReader.

Since:

4.0

Author:

Michael Minella, Glenn Renfro, Mahmoud Ben Hassine, Drummond Dawson

See Also:

• FlatFileItemReader

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FlatFileItemReaderBuilder.DelimitedBuilder<T>	A builder for constructing a DelimitedLineTokenizer
static class	FlatFileItemReaderBuilder.FixedLengthBuilder<T>	A builder for constructing a FixedLengthTokenizer

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.commons.logging.Log	logger

Constructor Summary

Constructors

Constructor	Description
FlatFileItemReaderBuilder()

Method Summary

Modifier and Type	Method	Description
FlatFileItemReaderBuilder<T>	addComment(String comment)	Add a string to the list of Strings that indicate commented lines.
FlatFileItemReaderBuilder<T>	beanFactory(org.springframework.beans.factory.BeanFactory beanFactory)	Configures the BeanFactory used to create the beans that are returned as items.
FlatFileItemReaderBuilder<T>	beanMapperStrict(boolean beanMapperStrict)	If set to true, mapping will fail if the FieldSet contains fields that cannot be mapped to the bean.
FlatFileItemReaderBuilder<T>	bufferedReaderFactory(BufferedReaderFactory factory)	Configure a custom BufferedReaderFactory for the reader.
FlatFileItemReader<T>	build()	Builds the FlatFileItemReader.
FlatFileItemReaderBuilder<T>	comments(String... comments)	Set an array of Strings that indicate lines that are comments (and therefore skipped by the reader).
FlatFileItemReaderBuilder<T>	currentItemCount(int currentItemCount)	Index for the current item.
FlatFileItemReaderBuilder<T>	customEditors(Map<Class<?>,PropertyEditor> customEditors)	Register custom type converters for beans being mapped.
FlatFileItemReaderBuilder.DelimitedBuilder<T>	delimited()	Returns an instance of a FlatFileItemReaderBuilder.DelimitedBuilder for building a DelimitedLineTokenizer.
FlatFileItemReaderBuilder<T>	distanceLimit(int distanceLimit)	Configures the maximum tolerance between the actual spelling of a field's name and the property's name.
FlatFileItemReaderBuilder<T>	encoding(String encoding)	Configure the encoding used by the reader to read the input source.
FlatFileItemReaderBuilder<T>	fieldSetMapper(FieldSetMapper<T> mapper)	A FieldSetMapper implementation to be used.
FlatFileItemReaderBuilder.FixedLengthBuilder<T>	fixedLength()	Returns an instance of a FlatFileItemReaderBuilder.FixedLengthBuilder for building a FixedLengthTokenizer.
FlatFileItemReaderBuilder<T>	lineMapper(LineMapper<T> lineMapper)	A LineMapper implementation to be used.
FlatFileItemReaderBuilder<T>	linesToSkip(int linesToSkip)	The number of lines to skip at the beginning of reading the file.
FlatFileItemReaderBuilder<T>	lineTokenizer(LineTokenizer tokenizer)	A LineTokenizer implementation to be used.
FlatFileItemReaderBuilder<T>	maxItemCount(int maxItemCount)	Configure the max number of items to be read.
FlatFileItemReaderBuilder<T>	name(String name)	The name used to calculate the key within the ExecutionContext.
FlatFileItemReaderBuilder<T>	prototypeBeanName(String prototypeBeanName)	Configures the id of a prototype scoped bean to be used as the item returned by the reader.
FlatFileItemReaderBuilder<T>	recordSeparatorPolicy(RecordSeparatorPolicy policy)	Configure a custom RecordSeparatorPolicy for the reader.
FlatFileItemReaderBuilder<T>	resource(org.springframework.core.io.Resource resource)	The Resource to be used as input.
FlatFileItemReaderBuilder<T>	saveState(boolean saveState)	Configure if the state of the ItemStreamSupport should be persisted within the ExecutionContext for restart purposes.
FlatFileItemReaderBuilder<T>	skippedLinesCallback(LineCallbackHandler callback)	A callback to be called for each line that is skipped.
FlatFileItemReaderBuilder<T>	strict(boolean strict)	Configure if the reader should be in strict mode (require the input Resource to exist).
FlatFileItemReaderBuilder<T>	targetType(Class<? extends T> targetType)	The class that will represent the "item" to be returned from the reader.

Methods inherited from class java.lang.Object

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

Field Details

logger

protected org.apache.commons.logging.Log logger

Constructor Details

FlatFileItemReaderBuilder

public FlatFileItemReaderBuilder()

Method Details

saveState

public FlatFileItemReaderBuilder<T> saveState(boolean saveState)

Configure if the state of the ItemStreamSupport should be persisted within the ExecutionContext for restart purposes.

Parameters:

saveState - defaults to true

Returns:

The current instance of the builder.

name

public FlatFileItemReaderBuilder<T> name(String name)

The name used to calculate the key within the ExecutionContext. Required if saveState(boolean) is set to true.

Parameters:

name - name of the reader instance

Returns:

The current instance of the builder.

See Also:

• ItemStreamSupport.setName(String)

maxItemCount

public FlatFileItemReaderBuilder<T> maxItemCount(int maxItemCount)

Configure the max number of items to be read.

Parameters:

maxItemCount - the max items to be read

Returns:

The current instance of the builder.

See Also:

• AbstractItemCountingItemStreamItemReader.setMaxItemCount(int)

currentItemCount

public FlatFileItemReaderBuilder<T> currentItemCount(int currentItemCount)

Index for the current item. Used on restarts to indicate where to start from.

Parameters:

currentItemCount - current index

Returns:

this instance for method chaining

See Also:

• AbstractItemCountingItemStreamItemReader.setCurrentItemCount(int)

addComment

public FlatFileItemReaderBuilder<T> addComment(String comment)

Add a string to the list of Strings that indicate commented lines. Defaults to FlatFileItemReader.DEFAULT_COMMENT_PREFIXES.

Parameters:

comment - the string to define a commented line.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setComments(String[])

comments

public FlatFileItemReaderBuilder<T> comments(String... comments)

Set an array of Strings that indicate lines that are comments (and therefore skipped by the reader). This method overrides the default comment prefixes which are FlatFileItemReader.DEFAULT_COMMENT_PREFIXES.

Parameters:

comments - an array of strings to identify comments.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setComments(String[])

recordSeparatorPolicy

public FlatFileItemReaderBuilder<T> recordSeparatorPolicy(RecordSeparatorPolicy policy)

Configure a custom RecordSeparatorPolicy for the reader.

Parameters:

policy - custom policy

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setRecordSeparatorPolicy(RecordSeparatorPolicy)

bufferedReaderFactory

public FlatFileItemReaderBuilder<T> bufferedReaderFactory(BufferedReaderFactory factory)

Configure a custom BufferedReaderFactory for the reader.

Parameters:

factory - custom factory

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setBufferedReaderFactory(BufferedReaderFactory)

resource

public FlatFileItemReaderBuilder<T> resource(org.springframework.core.io.Resource resource)

The Resource to be used as input.

Parameters:

resource - the input to the reader.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setResource(Resource)

strict

public FlatFileItemReaderBuilder<T> strict(boolean strict)

Configure if the reader should be in strict mode (require the input Resource to exist).

Parameters:

strict - true if the input file is required to exist.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setStrict(boolean)

encoding

public FlatFileItemReaderBuilder<T> encoding(String encoding)

Configure the encoding used by the reader to read the input source. Default value is FlatFileItemReader.DEFAULT_CHARSET.

Parameters:

encoding - to use to read the input source.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setEncoding(String)

linesToSkip

public FlatFileItemReaderBuilder<T> linesToSkip(int linesToSkip)

The number of lines to skip at the beginning of reading the file.

Parameters:

linesToSkip - number of lines to be skipped.

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setLinesToSkip(int)

skippedLinesCallback

public FlatFileItemReaderBuilder<T> skippedLinesCallback(LineCallbackHandler callback)

A callback to be called for each line that is skipped.

Parameters:

callback - the callback

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setSkippedLinesCallback(LineCallbackHandler)

lineMapper

public FlatFileItemReaderBuilder<T> lineMapper(LineMapper<T> lineMapper)

A LineMapper implementation to be used.

Parameters:

lineMapper - LineMapper

Returns:

The current instance of the builder.

See Also:

• FlatFileItemReader.setLineMapper(LineMapper)

fieldSetMapper

public FlatFileItemReaderBuilder<T> fieldSetMapper(FieldSetMapper<T> mapper)

A FieldSetMapper implementation to be used.

Parameters:

mapper - a FieldSetMapper

Returns:

The current instance of the builder.

See Also:

• DefaultLineMapper.setFieldSetMapper(FieldSetMapper)

lineTokenizer

public FlatFileItemReaderBuilder<T> lineTokenizer(LineTokenizer tokenizer)

A LineTokenizer implementation to be used.

Parameters:

tokenizer - a LineTokenizer

Returns:

The current instance of the builder.

See Also:

• DefaultLineMapper.setLineTokenizer(LineTokenizer)

delimited

public FlatFileItemReaderBuilder.DelimitedBuilder<T> delimited()

Returns an instance of a FlatFileItemReaderBuilder.DelimitedBuilder for building a DelimitedLineTokenizer. The DelimitedLineTokenizer configured by this builder will only be used if one is not explicitly configured via lineTokenizer

Returns:

a FlatFileItemReaderBuilder.DelimitedBuilder

fixedLength

public FlatFileItemReaderBuilder.FixedLengthBuilder<T> fixedLength()

Returns an instance of a FlatFileItemReaderBuilder.FixedLengthBuilder for building a FixedLengthTokenizer. The FixedLengthTokenizer configured by this builder will only be used if the lineTokenizer has not been configured.

Returns:

a FlatFileItemReaderBuilder.FixedLengthBuilder

targetType

public FlatFileItemReaderBuilder<T> targetType(Class<? extends T> targetType)

The class that will represent the "item" to be returned from the reader. This class is used via the BeanWrapperFieldSetMapper. If more complex logic is required, providing your own FieldSetMapper via fieldSetMapper is required.

Parameters:

targetType - The class to map to

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setTargetType(Class)

prototypeBeanName

public FlatFileItemReaderBuilder<T> prototypeBeanName(String prototypeBeanName)

Configures the id of a prototype scoped bean to be used as the item returned by the reader.

Parameters:

prototypeBeanName - the name of a prototype scoped bean

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setPrototypeBeanName(String)

beanFactory

public FlatFileItemReaderBuilder<T> beanFactory(org.springframework.beans.factory.BeanFactory beanFactory)

Configures the BeanFactory used to create the beans that are returned as items.

Parameters:

beanFactory - a BeanFactory

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setBeanFactory(BeanFactory)

customEditors

public FlatFileItemReaderBuilder<T> customEditors(Map<Class<?>,PropertyEditor> customEditors)

Register custom type converters for beans being mapped.

Parameters:

customEditors - a Map of editors

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setCustomEditors(Map)

distanceLimit

public FlatFileItemReaderBuilder<T> distanceLimit(int distanceLimit)

Configures the maximum tolerance between the actual spelling of a field's name and the property's name.

Parameters:

distanceLimit - distance limit to set

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setDistanceLimit(int)

beanMapperStrict

public FlatFileItemReaderBuilder<T> beanMapperStrict(boolean beanMapperStrict)

If set to true, mapping will fail if the FieldSet contains fields that cannot be mapped to the bean.

Parameters:

beanMapperStrict - defaults to false

Returns:

The current instance of the builder.

See Also:

• BeanWrapperFieldSetMapper.setStrict(boolean)

build

public FlatFileItemReader<T> build()

Builds the FlatFileItemReader.

Returns:

a FlatFileItemReader