Package net.sf.basedb.util.listable

Class SourceItemTransformerChain

java.lang.Object

net.sf.basedb.util.listable.SourceItemTransformerChain

All Implemented Interfaces:

SourceItemTransformer

public class SourceItemTransformerChain
extends Object
implements SourceItemTransformer

Chains together one or more source item transformers. Each step in the chain should take over from the previous in the sense that the SourceItemTransformer.getSourceItemType() of step N+1 must match the SourceItemTransformer.getTargetItemType() of step N.

Since:

3.5

Author:

Nicklas

Field Summary

Fields

Modifier and Type	Field	Description
private final List<SourceItemTransformer>	chain
private final Item	source
private final Item	target

Constructor Summary

Constructors

Constructor	Description
SourceItemTransformerChain(List<SourceItemTransformer> chain)	Create a new source item transformer chain.

Method Summary

Modifier and Type	Method	Description
private Set<Integer>	appendFakeSources(Set<Integer> existing)
Item	getSourceItemType()	Get the source item type of the first step in the chain.
Item	getTargetItemType()	Get the target item type of the last step in the chain.
Set<Integer>	transform(TransformContext context, Set<Integer> source)	Transform the source items into target items by invoking each step in the transformer chain.

Methods inherited from class java.lang.Object

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

Field Details

chain

private final List<SourceItemTransformer> chain

source

private final Item source

target

private final Item target

Constructor Details

SourceItemTransformerChain

public SourceItemTransformerChain(List<SourceItemTransformer> chain)

Create a new source item transformer chain. The chain must contain at least one element and all steps must have matching source and target item types.

Throws:

IllegalArgumentException - If the chain is null or empty or have non-matching transformation steps

Method Details

getSourceItemType

public Item getSourceItemType()

Get the source item type of the first step in the chain.

Specified by:

getSourceItemType in interface SourceItemTransformer

getTargetItemType

public Item getTargetItemType()

Get the target item type of the last step in the chain.

Specified by:

getTargetItemType in interface SourceItemTransformer

transform

public Set<Integer> transform(TransformContext context,
 Set<Integer> source)

Transform the source items into target items by invoking each step in the transformer chain.

Specified by:

transform in interface SourceItemTransformer

appendFakeSources

private Set<Integer> appendFakeSources(Set<Integer> existing)