Hi, I am starting to port an unfinished application to 4.0b1.
I have a Model class which uses an internal class as comparator. In
3.0.2 it did ok, but under 4.0b1 I get a java.lang.NoClassDefError.
could that have something with tapestry/hivemind ?
Here is the class. The exception is being thrown on sort();
Thanx, Ron
PS - I would suggest to add this class to 4.0 (after buetifying...)
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/*
* Created on Mar 10, 2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package net.tutim.tapestry.model;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import net.tutim.util.OgnlExpression;
import ognl.Ognl;
import ognl.OgnlException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tapestry.ApplicationRuntimeException;
import org.apache.tapestry.form.IPropertySelectionModel;
/**
* @author ron1
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class OgnlPropertySelectionModel implements IPropertySelectionModel {
private static final Log log = LogFactory
.getLog(OgnlPropertySelectionModel.class);
private String _valueProperty;
private String _labelProperty;
private String _optionProperty;
protected List list;
protected boolean nullable;
public OgnlPropertySelectionModel(Set set_, String labelProp_,
String valueProp_, String optionProp_, boolean nullable_) {
this(new ArrayList(set_),labelProp_, valueProp_, optionProp_,
nullable_);
}
public OgnlPropertySelectionModel sort(String ognl) {
Comparator c = new ListComparator(ognl);
Collections.sort(list, c);
return this;
}
public OgnlPropertySelectionModel sort() {
return sort(_labelProperty);
}
/**
* Constructs a Property Selection model which uses reflection on
the obejcts to
* get the label, value, and option object.
* If either of the given property names is null,
* it will return, for label and value, the toString() value of the
* object.
* For the option object, it will return the option object itself
(if the
* optionProp property is null).
*/
public OgnlPropertySelectionModel(List list_, String labelProp_,
String valueProp_, String optionProp_) {
this(list_, labelProp_, valueProp_, optionProp_, false);
}
public OgnlPropertySelectionModel(List list_, String labelProp_,
String valueProp_, String optionProp_, boolean nullable_) {
_valueProperty = valueProp_;
_labelProperty = labelProp_;
_optionProperty = optionProp_;
list = list_;
nullable = nullable_;
}
/* (non-Javadoc)
* @see
org.apache.tapestry.form.IPropertySelectionModel#getOptionCount()
*/
public int getOptionCount() {
return list == null ? 0 : list.size() + (nullable ? 1 : 0);
}
/* (non-Javadoc)
* @see org.apache.tapestry.form.IPropertySelectionModel#getOption(int)
*/
public Object getOption(int index) {
if (nullable && index == 0)
return null;
index -= (nullable ? 1 : 0);
if (_optionProperty == null)
return list.get(index);
else if ("".equals(_optionProperty))
return list.get(index).toString();
else
try {
return Ognl.getValue(_optionProperty, list.get(index));
} catch (Exception e) {
log.error(this,e);
return "ERROR";
}
}
/* (non-Javadoc)
* @see org.apache.tapestry.form.IPropertySelectionModel#getLabel(int)
*/
public String getLabel(int index) {
if (nullable && index == 0)
return " ";
index -= (nullable ? 1 : 0);
Object o = list.get(index);
try {
if (_labelProperty == null)
return o.toString();
else
return Ognl.getValue(_labelProperty,o).toString();
}
catch (Exception x) {
log.error(this,x);
return "ERROR";
}
}
/* (non-Javadoc)
* @see org.apache.tapestry.form.IPropertySelectionModel#getValue(int)
*/
public String getValue(int index) {
if (nullable && index == 0)
return " ";
index -= (nullable ? 1 : 0);
Object o = list.get(index);
try {
if (_valueProperty == null)
return o.toString();
else
return Ognl.getValue(_valueProperty,o).toString();
}
catch (Exception x) {
log.error(this,x);
return "ERROR";
}
}
/* (non-Javadoc)
* @see
org.apache.tapestry.form.IPropertySelectionModel#translateValue(java.lang.String)
*/
public Object translateValue(String value) {
for (int i = 0; i < getOptionCount(); i++ )
if (getValue(i).equals(value))
return getOption(i);
return null;
}
public void remove(Object o) {
list.remove(o);
}
public class ListComparator implements Comparator {
private OgnlExpression _ognl;
public ListComparator( String ognl ) {
try {
_ognl = new OgnlExpression(ognl);
}
catch (OgnlException ex) {
throw new ApplicationRuntimeException(ex);
}
}
public int compare(Object arg0, Object arg1) {
try {
return
((Comparable)_ognl.getValue(arg0)).compareTo(_ognl.getValue(arg1));
}
catch (Exception ex) {
throw new IllegalArgumentException(ex);
}
}
}
}
===============================================================================
package net.tutim.util;
import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;
public class OgnlExpression
{
private Object expression;
private OgnlContext context = new OgnlContext();
public OgnlExpression(String expressionString) throws OgnlException
{
super();
expression = Ognl.parseExpression(expressionString);
}
public Object getExpression()
{
return expression;
}
public Object getValue( Object rootObject) throws OgnlException
{
return Ognl.getValue(getExpression(), context, rootObject);
}
public void setValue( Object rootObject, Object value) throws
OgnlException
{
Ognl.setValue(getExpression(), context, rootObject, value);
}
}
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