openamf/src/java/org/openamf/filter MapListToRecordSet.java,NONE,1.1

Update of /cvsroot/openamf/openamf/src/java/org/openamf/filter
In directory sc8-pr-cvs1:/tmp/cvs-serv28527/src/java/org/openamf/filter

Added Files:
	MapListToRecordSet.java 
Log Message:
added new filter

--- NEW FILE: MapListToRecordSet.java ---
package org.openamf.filter;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openamf.config.FilterConfig;
import org.openamf.recordset.ASRecordSet;

public class MapListToRecordSet implements ResultFilter {

	private static Log log = LogFactory.getLog(MapListToRecordSet.class);

	public Object filter(Object value, FilterConfig config)
		throws FilterException {
		
		log.info("Translating MapListToRecordSet");
		
		ASRecordSet recordSet = null;
		List list = null;
		if (value instanceof List) {
			list = (List)value;
		} else if (value instanceof Iterator) {
			Iterator iterator = (Iterator)value;
			list = new ArrayList();
			while (iterator.hasNext()) {
				list.add(iterator.next());
			}
		}
		
		if (list != null) {
			recordSet = processList(list);
		} else {
			throw new FilterException("value is not an instance of List or Iterator");
		}
	
		return recordSet;	
	}

	private ASRecordSet processList(List list)
		throws FilterException {
		
		ASRecordSet recordSet = new ASRecordSet();	
		
		String[] columnNames = getColumnNames(list);
		list = convertList(list);
		try {	
			recordSet.populate(columnNames, list);
		} catch (Exception e) {
			throw new FilterException(e);
		}
		return recordSet;
	}
	
	private String[] getColumnNames(List list) {
		
		ArrayList names = new ArrayList();	
		Map map = (Map)list.get(0);
		for (Iterator i = map.entrySet().iterator(); i.hasNext();) {
			Map.Entry entry = (Map.Entry)i.next();
			names.add((String)entry.getKey());
		}

		String[] columnNames =  new String[names.size()];
		int index = 0;
		for (Iterator i = names.iterator(); i.hasNext();) {
			String name = (String) i.next();
			columnNames[index] = name;
			index++;
		}
		
		return columnNames;
	}

	private List convertList(List list) {
		
		ArrayList rows = new ArrayList();
		
		for (Iterator i = list.iterator(); i.hasNext();) {
			Map map = (Map) i.next();
			rows.add(new ArrayList(map.values()));
		}
		
		return rows;
	}


}




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