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org.richfaces.component.util.SelectUtils Maven / Gradle / Ivy
/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.richfaces.component.util;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import javax.el.ValueExpression;
import javax.faces.application.ProjectStage;
import javax.faces.component.UIComponent;
import javax.faces.component.UISelectItem;
import javax.faces.component.UISelectItems;
import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;
import org.richfaces.log.Logger;
import org.richfaces.log.RichfacesLogger;
import org.richfaces.renderkit.util.RendererUtils;
import com.google.common.collect.AbstractIterator;
import com.google.common.collect.Iterators;
/**
* @author Maksim Kaszynski
*/
public final class SelectUtils {
private static final Logger LOG = RichfacesLogger.APPLICATION.getLogger();
private static final class GenericObjectSelectItem extends SelectItem {
private static final long serialVersionUID = -714217221281952395L;
private static final RendererUtils UTILS = RendererUtils.getInstance();
private static final String VAR = "var";
private static final String ITEM_VALUE = "itemValue";
private static final String ITEM_LABEL = "itemLabel";
private static final String ITEM_DESCRIPTION = "itemDescription";
private static final String ITEM_ESCAPED = "itemLabelEscaped";
private static final String ITEM_DISABLED = "itemDisabled";
private static final String NO_SELECTION_OPTION = "noSelectionOption";
private GenericObjectSelectItem() {
}
private void updateItem(FacesContext facesContext, UIComponent sourceComponent, Object value) {
String var = (String) sourceComponent.getAttributes().get(VAR);
Map requestMap = facesContext.getExternalContext().getRequestMap();
Object oldVarValue = null;
if (var != null) {
oldVarValue = requestMap.put(var, value);
}
try {
Map attrs = sourceComponent.getAttributes();
Object itemValueResult = attrs.get(ITEM_VALUE);
Object itemLabelResult = attrs.get(ITEM_LABEL);
Object itemDescriptionResult = attrs.get(ITEM_DESCRIPTION);
setValue(itemValueResult != null ? itemValueResult : value);
setLabel(itemLabelResult != null ? itemLabelResult.toString() : value.toString());
setDescription(itemDescriptionResult != null ? itemDescriptionResult.toString() : null);
setEscape(UTILS.isBooleanAttribute(sourceComponent, ITEM_ESCAPED));
setDisabled(UTILS.isBooleanAttribute(sourceComponent, ITEM_DISABLED));
setNoSelectionOption(UTILS.isBooleanAttribute(sourceComponent, NO_SELECTION_OPTION));
} finally {
if (var != null) {
if (oldVarValue != null) {
requestMap.put(var, oldVarValue);
} else {
requestMap.remove(var);
}
}
}
}
}
private static final class MapItemsIterator extends AbstractIterator {
private Iterator data;
public MapItemsIterator(Map map) {
super();
this.data = map.entrySet().iterator();
}
@Override
protected SelectItem computeNext() {
if (data.hasNext()) {
Entry next = (Entry) data.next();
return new SelectItem(next.getValue(), next.getKey().toString());
}
return endOfData();
}
}
private static final class GenericItemsIterator extends AbstractIterator {
private FacesContext facesContext;
private UIComponent component;
private Iterator data;
public GenericItemsIterator(FacesContext facesContext, UIComponent component, Iterator data) {
super();
this.facesContext = facesContext;
this.component = component;
this.data = data;
}
@Override
protected SelectItem computeNext() {
if (data.hasNext()) {
Object next = data.next();
if (next instanceof SelectItem) {
return (SelectItem) next;
} else {
GenericObjectSelectItem genericItem = new GenericObjectSelectItem();
genericItem.updateItem(facesContext, component, next);
return genericItem;
}
}
return endOfData();
}
}
private static final class SelectItemsIterator extends AbstractIterator {
private Iterator children;
private Iterator items = Iterators.emptyIterator();
private FacesContext context;
public SelectItemsIterator(FacesContext context, Iterator children) {
this.context = context;
this.children = children;
}
@Override
protected SelectItem computeNext() {
while (items.hasNext() || children.hasNext()) {
if (items.hasNext()) {
SelectItem nextItem = items.next();
if (!items.hasNext()) {
// free iterator
items = Iterators.emptyIterator();
}
return nextItem;
} else {
items = createIterator(children.next());
}
}
return endOfData();
}
private Iterator createUISelectItemIterator(UISelectItem selectItem) {
Object value = selectItem.getValue();
SelectItem result = null;
if (value == null) {
result = new SelectItem(selectItem.getItemValue(), selectItem.getItemLabel(), selectItem.getItemDescription(),
selectItem.isItemDisabled(), selectItem.isItemEscaped(), selectItem.isNoSelectionOption());
} else if (value instanceof SelectItem) {
result = (SelectItem) value;
} else {
ValueExpression expression = selectItem.getValueExpression("value");
throw new IllegalArgumentException("ValueExpression '"
+ (expression == null ? null : expression.getExpressionString()) + "' of UISelectItem : "
+ RichfacesLogger.getComponentPath(selectItem) + " does not reference an Object of type SelectItem");
}
return Iterators.singletonIterator(result);
}
private Iterator createSelectItemsIterator(UIComponent component, Object value) {
if (value == null) {
return Iterators.emptyIterator();
} else if (value instanceof SelectItem) {
return Iterators.singletonIterator((SelectItem) value);
} else if (value instanceof Object[]) {
Iterator data = Iterators.forArray((Object[]) value);
return new GenericItemsIterator(context, component, data);
} else if (value instanceof Iterable) {
Iterator data = ((Iterable) value).iterator();
return new GenericItemsIterator(context, component, data);
} else if (value instanceof Map) {
return new MapItemsIterator((Map) value);
} else {
Logger.Level level = Logger.Level.INFO;
if (!context.isProjectStage(ProjectStage.Production)) {
level = Logger.Level.WARNING;
}
if (LOG.isLogEnabled(level)) {
ValueExpression expression = component.getValueExpression("value");
LOG.log(level, String.format("ValueExpression %s of UISelectItems with component-path %s"
+ " does not reference an Object of type SelectItem," + " array, Iterable or Map, but of type: %s",
(expression == null ? null : expression.getExpressionString()),
RichfacesLogger.getComponentPath(component), (value == null ? null : value.getClass().getName())));
}
}
return Iterators.emptyIterator();
}
private Iterator createUISelectItemsIterator(UISelectItems selectItems) {
Object value = selectItems.getValue();
return createSelectItemsIterator(selectItems, value);
}
private Iterator createUISelectItemsInterfaceIterator(UIComponent component) {
Object value = ((SelectItemsInterface)component).getItemValues();
return createSelectItemsIterator(component, value);
}
private Iterator createIterator(UIComponent child) {
if (!child.isRendered()) {
return Iterators.emptyIterator();
}
if (child instanceof UISelectItem) {
return createUISelectItemIterator((UISelectItem) child);
} else if (child instanceof UISelectItems) {
return createUISelectItemsIterator((UISelectItems) child);
} else if (child instanceof SelectItemsInterface) {
return createUISelectItemsInterfaceIterator(child);
}
return Iterators.emptyIterator();
}
}
private SelectUtils() {
}
/**
* Gathers all select items from specified component's children
*
* @param context Faces context
* @param component UIComponent with UISelectItem or UISelectItems children
* @return list of {@link SelectItem} taken from f:selectItem and f:selectItems
*/
public static Iterator getSelectItems(FacesContext context, UIComponent component) {
Iterator children = component.getChildren().iterator();
if (component instanceof SelectItemsInterface) {
Iterator self = Iterators.singletonIterator(component);
children = Iterators.concat(self, children);
}
Iterator iterator = new SelectItemsIterator(context, children);
return iterator;
}
}
