public List list(String ofWhat){
String peerName = MODEL_CLASS_PREFIX + ofWhat + "Peer";
try{
Class peer = Class.forName(peerName);
Object o = peer.newInstance();
return ((BasePeer)o).doSelect(new Criteria());
} catch (Exception e){/*do something*/;}
return null;
}I'll look into it & try it.
But I was assuming there was some simpler method of accomplishing the same goal where one doesn't need to know this kind of stuff. This would seem to be a question that would crop up often, especially at the beginning of a project or for proof-of-concept work.
Russell Edens wrote:
Rankin said:
I have many tables, which for the moment are separately defined. I want one template, DisplayTable.vm, to display any one of these tables. So, DisplayTable.java has:
public void doBuildTemplate(){ ... String tablename = data.getParameters().getString("tablename",null); Criteria crit = new Criteria(); List list = [**tablename**]Peer.doSelect(crit); context.put("list", list); TableMap tmap = Torque.getDatabaseMap("mydb").getTable(tablename); ColumnMap[] cMap = tmap.getColumns(); Vector names; for(int i = cMap.length -1; i >=0; i--) names.add(cMap[i].getColumnName()); context.put("columnNames", names.toArray()); ... }
and DisplayTable.vm has
<tr> #foreach ($columName in $columnNames) <th>$columnName</th> #end </tr> #foreach ($item in $itemList) <TR> #foreach ($attribute in $columnNames) <TD>$!{item.$attribute}</TD> #end </TR> #end
I'm sure this has been done many times far more easily and other suggestions would be greatly appreciated ... However - how does one do the "[tablename]Peer.doSelect(crit)" bit?
Suggestions??
If you want to do it generically reflection is your best bet.
You might consider the org.apache.commons.beanutils.MethodUtils class for making these calls. Un-tested example:
private List invokeDoSelect(String fullyQualifiedTorquePeerObjectName, Criteria crit)
{
final Class[] doSelectParamTypes = { Criteria.class };
final Object[] doSelectParams = { crit };
Object results = null;
try
{
Class peerClass = Class.forName(fullyQualifiedTorquePeerObjectName);
results = MethodUtils.invokeExactMethod(peerClass, "doSelect",
doSelectParams, doSelectParamTypes);
}
catch (NoSuchMethodException e)
{
// TODO handle this
}
catch (IllegalAccessException e)
{
// TODO handle this
}
catch (InvocationTargetException e)
{
// TODO handle this
}
catch (ClassNotFoundException e)
{
// TODO handle this
}
return (List)results; }
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