package org.apache.myfaces.tobago.component;
/*
* 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.
*/
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.myfaces.tobago.event.PageActionEvent;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_FIRST;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.el.MethodNotFoundException;
import javax.faces.el.ValueBinding;
public class Pager extends MethodBinding {
private static final Log LOG = LogFactory.getLog(Pager.class);
public Class getType(FacesContext facescontext)
throws MethodNotFoundException {
return String.class;
}
public Object invoke(FacesContext facesContext, Object[] aobj)
throws EvaluationException {
if (aobj[0] instanceof PageActionEvent) {
PageActionEvent pageEvent = (PageActionEvent) aobj[0];
UIData sheet = pageEvent.getSheet();
int first = -1;
if (LOG.isDebugEnabled()) {
LOG.debug("action = '" + pageEvent.getAction().name() + "'");
}
int start;
switch (pageEvent.getAction()) {
case FIRST:
first = 0;
break;
case PREV:
start = sheet.getFirst() - sheet.getRows();
first = start < 0 ? 0 : start;
break;
case NEXT:
if (sheet.hasRowCount()) {
start = sheet.getFirst() + sheet.getRows();
first = start > sheet.getRowCount() ? sheet.getLastPageIndex() : start;
} else {
if (sheet.isAtEnd()) {
first = sheet.getFirst();
} else {
first = sheet.getFirst() + sheet.getRows();
}
}
break;
case LAST:
first = sheet.getLastPageIndex();
break;
case TO_ROW:
start = pageEvent.getValue() - 1;
if (start > sheet.getLastPageIndex()) {
start = sheet.getLastPageIndex();
} else if (start < 0) {
start = 0;
}
first = start;
break;
case TO_PAGE:
start = pageEvent.getValue() - 1;
if (LOG.isDebugEnabled()) {
LOG.debug("start = " + start + " sheet.getRows() = "
+ sheet.getRows() + " => start = " + (start * sheet.getRows()));
}
start = start * sheet.getRows();
if (start > sheet.getLastPageIndex()) {
start = sheet.getLastPageIndex();
} else if (start < 0) {
start = 0;
}
first = start;
break;
default:
// can't happen
}
ValueBinding valueBinding = sheet.getValueBinding(ATTR_FIRST);
if (valueBinding != null) {
valueBinding.setValue(facesContext, first);
} else {
sheet.setFirst(first);
}
sheet.getSheetState(facesContext).setFirst(first);
// sheet.queueEvent(new SheetStateChangeEvent(sheet));
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("aobj[0] instanceof '" + aobj[0] + "'");
}
}
return null;
}
}