de.laures.cewolf.example
Class PageViewCountData

java.lang.Object
  de.laures.cewolf.example.PageViewCountData

All Implemented Interfaces:

CategoryItemLinkGenerator, org.jfree.chart.tooltips.CategoryToolTipGenerator, DatasetProducer, LinkGenerator, java.io.Serializable, org.jfree.chart.tooltips.ToolTipGenerator

public class PageViewCountData

extends java.lang.Object

implements DatasetProducer, CategoryItemLinkGenerator, org.jfree.chart.tooltips.CategoryToolTipGenerator, java.io.Serializable

An example data producer.

Author:

Guido Laures

See Also:

Serialized Form

Field Summary

Fields inherited from interface de.laures.cewolf.DatasetProducer

PRODUCER_ATTRIBUTE_NAME

Constructor Summary

PageViewCountData()

Method Summary

protected void	finalize()
java.lang.String	generateLink(java.lang.Object data, int series, java.lang.Object category) Returns a link target for a special data item.
java.lang.String	generateToolTip(org.jfree.data.CategoryDataset arg0, int series, int arg2)
java.lang.String	getProducerId() Returns a unique ID for this DatasetProducer
boolean	hasExpired(java.util.Map params, java.util.Date since) This producer's data is invalidated after 5 seconds.
java.lang.Object	produceDataset(java.util.Map params) Produces some random data.

Methods inherited from class java.lang.Object

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

Constructor Detail

PageViewCountData

public PageViewCountData()

Method Detail

produceDataset

public java.lang.Object produceDataset(java.util.Map params)
                                throws DatasetProduceException

Produces some random data.

Specified by:

produceDataset in interface DatasetProducer

Parameters:

params - additional params for the dataset production. All elements of this HashMap are of type java.io.Serializable. This is necessary to ensure the the serialization of the dataset producer into the http session. To provide a producer with additional production parameters the <param> tag is used (see tag library documentation). It is recommended to synchronize implementations of this method to avoid concurrency problems.

Returns:

an object of type org.jfree.data.Dataset.

Throws:

DatasetProduceException - if an error occured during production

hasExpired

public boolean hasExpired(java.util.Map params,
                          java.util.Date since)

This producer's data is invalidated after 5 seconds. By this method the producer can influence Cewolf's caching behaviour the way it wants to.

Specified by:

hasExpired in interface DatasetProducer

Parameters:

params - the production parameters of the already produced data

since - the point in time when the already produced data had been produced

Returns:

true if the data which had been produced with the passed in parameters has expired since its creation, false otherwise

getProducerId

public java.lang.String getProducerId()

Returns a unique ID for this DatasetProducer

Specified by:

getProducerId in interface DatasetProducer

Returns:

the unique ID for instances of this poducer class

generateLink

public java.lang.String generateLink(java.lang.Object data,
                                     int series,
                                     java.lang.Object category)

Returns a link target for a special data item.

Specified by:

generateLink in interface CategoryItemLinkGenerator

Parameters:

data - the dataset

series - the series number

category - the category

See Also:

CategoryDataset

finalize

protected void finalize()
                 throws java.lang.Throwable

Throws:

java.lang.Throwable

See Also:

Object.finalize()

generateToolTip

public java.lang.String generateToolTip(org.jfree.data.CategoryDataset arg0,
                                        int series,
                                        int arg2)

Specified by:

generateToolTip in interface org.jfree.chart.tooltips.CategoryToolTipGenerator

See Also:

CategoryToolTipGenerator.generateToolTip(CategoryDataset, int, int)