// **********************************************************************
// <copyright>
// BBN Technologies
// 10 Moulton Street
// Cambridge, MA 02138
// (617) 873-8000
//
// Copyright (C) BBNT Solutions LLC. All rights reserved.
// </copyright>
// **********************************************************************
// $Source: /cvs/distapps/openmap/src/vpfservlet/WEB-INF/src/com/bbn/openmap/vpfservlet/ComplexJoinRowMaker.java,v $
// $Revision: 1.2.2.2 $ $Date: 2005/08/11 21:03:09 $ $Author: dietrick $
// **********************************************************************
package com.bbn.openmap.vpfservlet;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.bbn.openmap.io.FormatException;
import com.bbn.openmap.layer.util.html.TableDataElement;
import com.bbn.openmap.layer.util.html.TableRowElement;
import com.bbn.openmap.layer.vpf.DcwRecordFile;
import com.bbn.openmap.layer.vpf.FeatureClassInfo;
/**
* A RowMaker subclass that handles joins between tables, where the
* column guiding the join of the second table is not "id", and thus
* not simply the row identifier.
*/
public class ComplexJoinRowMaker extends PlainRowMaker {
/** the column that contains the foreign key to the primitive table */
final int theColumn;
/** the column that contains the tile identifier */
final int tileColumn;
/** a list reused to load join rows */
final List jtrow = new ArrayList();
/** a map from the table key to row id */
final Map keyMap;
/** the table we're joining with */
final DcwRecordFile joinTable;
public ComplexJoinRowMaker(DcwRecordFile table, String joinColumnName,
String tableName, String tableKeyColumn, boolean isTiled)
throws FormatException {
theColumn = table.whatColumn(joinColumnName);
tileColumn = table.whatColumn(FeatureClassInfo.TILE_ID_COLUMN_NAME);
if (isTiled) {
throw new FormatException("can't complex join with tiling (yet)");
}
joinTable = new DcwRecordFile(new File(table.getTableFile()).getParentFile()
+ File.separator + tableName);
keyMap = getKeyMap(tableKeyColumn);
}
HashMap getKeyMap(String keyColumn) throws FormatException {
int jcol = joinTable.whatColumn(keyColumn);
HashMap retmap = new HashMap();
while (joinTable.parseRow(jtrow)) {
retmap.put(jtrow.get(jcol), jtrow.get(0));
}
return retmap;
}
public void addToRow(TableRowElement row, List l) {
int i = 0;
for (Iterator li = l.iterator(); li.hasNext();) {
Object elt = li.next();
if (i == theColumn) {
Number wrow = (Number) keyMap.get(elt);
// int tileId = (tileColumn == -1) ? -1
// : VPFUtil.objectToInt(l.get(tileColumn));
try {
if (wrow == null) {
row.addElement("[" + elt + "]");
} else if (joinTable.getRow(jtrow, wrow.intValue())) {
for (Iterator it = jtrow.iterator(); it.hasNext();) {
row.addElement(new TableDataElement("CLASS=JoinColumn", it.next()
.toString()));
}
} else {
row.addElement("Join failed!");
}
} catch (FormatException fe) {
row.addElement(fe.toString());
}
} else {
row.addElement(elt.toString());
}
i++;
}
}
public void close() {
joinTable.close();
}
}