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);
}
}