Package com.tangosol.coherence.dslquery

Class ChainedExtractorBuilder

java.lang.Object

com.tangosol.coherence.dslquery.ChainedExtractorBuilder

All Implemented Interfaces:

ExtractorBuilder

public class ChainedExtractorBuilder
extends Object
implements ExtractorBuilder

An ExtractorBuilder implementation that delegates building ValueExtractors to a chain of ExtractorBuilders and returns the result from the first ExtractorBuilder to return a non-null value from its realize(String, int, String) method.

Since:

Coherence 12.2.1

Author:

jk 2014.07.15

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<ExtractorBuilder>	f_listBuilders	The chain of ExtractorBuilders to delegate to.

Constructor Summary

Constructors

Constructor	Description
ChainedExtractorBuilder(ExtractorBuilder... aBuilders)	Construct a ChainedExtractorBuilder that uses the specified chain of ExtractorBuilders to realize instances of ValueExtractors.

Method Summary

Modifier and Type	Method	Description
ValueExtractor	realize(String sCacheName, int nTarget, String sProperties)	Call the realize(String, int, String) method on each ExtractorBuilder in the chain returning the result of the first ExtractorBuilder to return a non-null value.

Methods inherited from class java.lang.Object

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

Field Details

f_listBuilders

protected final List<ExtractorBuilder> f_listBuilders

The chain of ExtractorBuilders to delegate to.

Constructor Details

ChainedExtractorBuilder

public ChainedExtractorBuilder(ExtractorBuilder... aBuilders)

Construct a ChainedExtractorBuilder that uses the specified chain of ExtractorBuilders to realize instances of ValueExtractors.

Parameters:

aBuilders - the chain of ExtractorBuilder to use

Method Details

realize

public ValueExtractor realize(String sCacheName,
 int nTarget,
 String sProperties)

Call the realize(String, int, String) method on each ExtractorBuilder in the chain returning the result of the first ExtractorBuilder to return a non-null value.

Specified by:

realize in interface ExtractorBuilder

Parameters:

sCacheName - the name of the cache the ValueExtractor will be invoked against

nTarget - the target for the ValueExtractor

sProperties - the path to the property value to extract

Returns:

a ValueExtractor for the given cache name, target and properties or null if non of the ExtractorBuilder returned a non-null value