jasperreports实现通用数据源

javasogo

package com.icetree.datasource;
import java.util.Iterator;
import java.util.List;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
public class CommonQueryResultDataSource implements JRDataSource {
private String[] fields;
private Iterator iterator;
private Object currentValue;
public CommonQueryResultDataSource(List list, String[] fields) {
this.fields = fields;
this.iterator = list.iterator();
}
public Object getFieldValue(JRField field) throws JRException {
Object value = null;
String fieldName = field.getName();
int index = getFieldIndex(fieldName);
if (index > -1) {
Object[] values = (Object[]) currentValue;
value = values[index];
}
return value;
}
public boolean next() throws JRException {
currentValue = iterator.hasNext() ? iterator.next() : null;
return (currentValue != null);
}
private int getFieldIndex(String field) {
int index = -1;
for (int i = 0; i < fields.length; i++) {
if (fields[i].equals(field)) {
index = i;
break;
}
}
return index;
}
}