/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.extensions.markup.html.form.palette.component;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.wicket.extensions.markup.html.form.palette.Palette;
import org.apache.wicket.markup.html.form.HiddenField;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.string.Strings;
/**
* Component to keep track of selections on the html side. Also used for
* encoding and decoding those selections between html and java.
*
* @author Igor Vaynberg ( ivaynberg )
*/
public class Recorder extends HiddenField
{
private static final long serialVersionUID = 1L;
private static final String[] EMPTY_IDS = new String[0];
/** conviniently maintained array of selected ids */
private String[] ids;
/** parent palette object */
private Palette palette;
private boolean attached = false;
/**
* @return parent Palette object
*/
public Palette getPalette()
{
return palette;
}
/**
* @param id
* component id
* @param palette
* parent palette object
*/
public Recorder(String id, Palette palette)
{
super(id);
this.palette = palette;
setOutputMarkupId(true);
}
protected void onBeforeRender()
{
super.onBeforeRender();
if (!getForm().hasError())
{
initIds();
}
attached = true;
}
/**
* Syncrhonize ids collection from the palette's model
*/
private void initIds()
{
// construct the model string based on selection collection
IChoiceRenderer renderer = getPalette().getChoiceRenderer();
StringBuffer modelStringBuffer = new StringBuffer();
Iterator selection = getPalette().getModelCollection().iterator();
int i = 0;
while (selection.hasNext())
{
modelStringBuffer.append(renderer.getIdValue(selection.next(), i++));
if (selection.hasNext())
{
modelStringBuffer.append(",");
}
}
// set model and update ids array
String modelString = modelStringBuffer.toString();
setModel(new Model(modelString));
updateIds(modelString);
}
protected void onValid()
{
super.onValid();
if (attached)
updateIds();
}
/**
* @return iterator over selected choices
*/
public Iterator getSelectedChoices()
{
IChoiceRenderer renderer = getPalette().getChoiceRenderer();
if (ids.length == 0)
{
return Collections.EMPTY_LIST.iterator();
}
List selected = new ArrayList(ids.length);
for (int i = 0; i < ids.length; i++)
{
Iterator it = getPalette().getChoices().iterator();
while (it.hasNext())
{
final Object choice = it.next();
if (renderer.getIdValue(choice, 0).equals(ids[i]))
{
selected.add(choice);
break;
}
}
}
return selected.iterator();
}
/**
* @return iterator over unselected choices
*/
public Iterator getUnselectedChoices()
{
IChoiceRenderer renderer = getPalette().getChoiceRenderer();
Collection choices = getPalette().getChoices();
if (choices.size() - ids.length == 0)
{
return Collections.EMPTY_LIST.iterator();
}
List unselected = new ArrayList(Math.max(1, choices.size() - ids.length));
Iterator it = choices.iterator();
while (it.hasNext())
{
final Object choice = it.next();
final String choiceId = renderer.getIdValue(choice, 0);
boolean selected = false;
for (int i = 0; i < ids.length; i++)
{
if (ids[i].equals(choiceId))
{
selected = true;
break;
}
}
if (!selected)
{
unselected.add(choice);
}
}
return unselected.iterator();
}
protected void onInvalid()
{
super.onInvalid();
if (attached)
updateIds();
}
private void updateIds()
{
updateIds(getValue());
}
private void updateIds(String value)
{
if (Strings.isEmpty(value))
{
ids = EMPTY_IDS;
}
else
{
ids = value.split(",");
}
}
}