/*
* 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.myfaces.shared_tomahawk.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import javax.faces.component.UIComponent;
import javax.faces.component.UISelectItem;
import javax.faces.component.UISelectItems;
import javax.faces.el.ValueBinding;
import javax.faces.model.SelectItem;
import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
/**
* @author Mathias Broekelmann (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class SelectItemsIterator implements Iterator
{
private final Iterator _childs;
private Iterator _nestedItems;
private Object _nextItem;
private String _collectionLabel;
private UISelectItems _currentUISelectItems;
public SelectItemsIterator(UIComponent selectItemsParent)
{
_childs = selectItemsParent.getChildren().iterator();
}
public boolean hasNext()
{
if(_nextItem != null)
{
return true;
}
if(_nestedItems != null)
{
if(_nestedItems.hasNext())
{
return true;
}
_nestedItems = null;
}
if (_childs.hasNext())
{
UIComponent child = (UIComponent) _childs.next();
// When there is other components nested that does
// not extends from UISelectItem or UISelectItems
// the behavior for this iterator is just skip this
// element(s) until an element that extends from these
// classes are found. If there is no more elements
// that conform this condition, just return false.
while (!(child instanceof UISelectItem)
&& !(child instanceof UISelectItems))
{
//Try to skip it
if (_childs.hasNext())
{
//Skip and do the same check
child = (UIComponent) _childs.next();
}
else
{
//End loop, so the final result is return false,
//since there are no more components to iterate.
return false;
}
}
if (child instanceof UISelectItem)
{
UISelectItem uiSelectItem = (UISelectItem) child;
Object item = uiSelectItem.getValue();
if (item == null)
{
Object itemValue = ((UISelectItem) child).getItemValue();
String label = ((UISelectItem) child).getItemLabel();
String description = ((UISelectItem) child)
.getItemDescription();
boolean disabled = ((UISelectItem) child).isItemDisabled();
boolean escaped = ((UISelectItem) child).isItemEscaped();
if (label == null)
{
label = itemValue.toString();
}
item = new SelectItem(itemValue, label, description,
disabled, escaped);
}
else if (!(item instanceof SelectItem))
{
ValueBinding binding = ((UISelectItem) child)
.getValueBinding("value");
throw new IllegalArgumentException(
"Value binding '"
+ (binding == null ? null : binding.getExpressionString())
+ "' of UISelectItem : "
+ RendererUtils.getPathToComponent(child)
+ " does not reference an Object of type SelectItem");
}
_nextItem = item;
return true;
}
else if (child instanceof UISelectItems)
{
_currentUISelectItems = ((UISelectItems) child);
Object value = _currentUISelectItems.getValue();
if (value instanceof SelectItem)
{
_nextItem = value;
return true;
}
else if (value instanceof SelectItem[])
{
_nestedItems = Arrays.asList((SelectItem[]) value)
.iterator();
_collectionLabel = "Array";
return hasNext();
}
else if (value instanceof Collection)
{
_nestedItems = ((Collection)value).iterator();
_collectionLabel = "Collection";
return hasNext();
}
else if (value instanceof Map)
{
Map map = ((Map) value);
Collection items = new ArrayList(map.size());
for (Iterator it = map.entrySet().iterator(); it
.hasNext();)
{
Map.Entry entry = (Map.Entry) it.next();
items.add(new SelectItem(entry.getValue(), entry
.getKey().toString()));
}
_nestedItems = items.iterator();
_collectionLabel = "Map";
return hasNext();
}
else
{
ValueBinding binding = _currentUISelectItems.getValueBinding("value");
throw new IllegalArgumentException(
"Value binding '"
+ (binding == null ? null : binding
.getExpressionString())
+ "'of UISelectItems with component-path "
+ RendererUtils.getPathToComponent(child)
+ " does not reference an Object of type SelectItem, SelectItem[], Collection or Map but of type : "
+ ((value == null) ? null : value
.getClass()
.getName()));
}
}
}
return false;
}
public Object next()
{
if (!hasNext())
{
throw new NoSuchElementException();
}
if(_nextItem != null)
{
Object value = _nextItem;
_nextItem = null;
return value;
}
if (_nestedItems != null)
{
Object item = _nestedItems.next();
if (!(item instanceof SelectItem))
{
ValueBinding binding = _currentUISelectItems
.getValueBinding("value");
throw new IllegalArgumentException(
_collectionLabel + " referenced by UISelectItems with binding '"
+ binding.getExpressionString()
+ "' and Component-Path : " + RendererUtils.getPathToComponent(_currentUISelectItems)
+ " does not contain Objects of type SelectItem");
}
return item;
}
throw new NoSuchElementException();
}
public void remove()
{
throw new UnsupportedOperationException();
}
}