jasperreport自定义JRDataSource

package com.sniper.reports.util;

 

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.Comparator;

import java.util.Iterator;

import java.util.List;

 

import net.sf.jasperreports.engine.JRException;

import net.sf.jasperreports.engine.JRField;

import net.sf.jasperreports.engine.data.JRAbstractBeanDataSource;

 

import com.sniper.reports.model.ItemStatReport;

 

public class PaAnCustomJRdataSource extends JRAbstractBeanDataSource {

 

/**

* dataSource

*/

private Collection<ItemStatReport> data;

private Object currentBean;

private Iterator<ItemStatReport> iterator;

private List<ItemStatReport> allData;

private int index = -1;

 

public PaAnCustomJRdataSource(Collection<ItemStatReport> collection) {

super(true);

if (collection.size() > 0) {

this.allData = (List<ItemStatReport>) collection;

List<ItemStatReport> list = (List<ItemStatReport>) collection;

Collections.sort(list, new Comparator<ItemStatReport>() {

public int compare(ItemStatReport o1, ItemStatReport o2) {

return o1.getSeqNumber() - o2.getSeqNumber();

}

});

List<ItemStatReport> dataList = new ArrayList<ItemStatReport>();

ItemStatReport itmesr = list.get(0);

int seqNumber = itmesr.getSeqNumber();

for (ItemStatReport isr : allData) {

if (isr.getSeqNumber() == seqNumber) {

dataList.add(isr);

} else {

break;

}

}

this.data = dataList;

this.iterator = data.iterator();

}

 

}

 

/**

*

*/

public boolean next() {

index++;

boolean hasNext = false;

if (this.iterator != null) {

hasNext = this.iterator.hasNext();

if (hasNext) {

this.currentBean = this.iterator.next();

}

}

return hasNext;

}

 

/**

*

*/

public Object getFieldValue(JRField field) throws JRException {

Object value = null;

String fieldName = field.getName();

String[] arr = fieldName.split("_");

if (arr.length > 1) {

int seqNumber = Integer.parseInt(arr[1]);

int dataLength = this.data.size();

int inteNumber = (seqNumber * dataLength) + this.index;

ItemStatReport positionObj = this.allData.get(inteNumber);

ItemStatReport currentObj = (ItemStatReport) currentBean;

if (currentObj.getStockOrgName().equals(positionObj.getStockOrgName())) {

value = getFieldValue(positionObj, field);

} else {

//FIXME:the list is sort error!

}

} else {

value = getFieldValue(currentBean, field);

}

return value;

}

 

/**

*

*/

public void moveFirst() {

if (this.data != null) {

this.iterator = this.data.iterator();

}

}

 

/**

* Returns the underlying bean collection used by this data source.

* 

* @return the underlying bean collection

*/

public Collection<ItemStatReport> getData() {

return data;

}

 

/**

* Returns the total number of records/beans that this data source

* contains.

* 

* @return the total number of records of this data source

*/

public int getRecordCount() {

return data == null ? 0 : data.size();

}

 

/**

* Clones this data source by creating a new instance that reuses the same

* underlying bean collection. 

* 

* @return a clone of this data source

*/

public PaAnCustomJRdataSource cloneDataSource() {

return new PaAnCustomJRdataSource(data);

}

 

}