/**
* Copyright (C) 2012 JBoss Inc
*
* Licensed 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.jboss.dashboard.ui.formatters;
import org.jboss.dashboard.ui.components.MessagesComponentHandler;
import org.jboss.dashboard.ui.components.PaginationComponentHandler;
import org.jboss.dashboard.ui.components.PaginationContentProvider;
import org.jboss.dashboard.ui.taglib.formatter.Formatter;
import org.jboss.dashboard.ui.taglib.formatter.FormatterException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
public class PaginationComponentFormatter extends Formatter {
private static transient org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(PaginationComponentFormatter.class.getName());
public static final String PARAM_ELEMENT = "element";
public static final String PARAM_INDEX = "index";
public static final String PARAM_POSITION = "position";
public static final String PARAM_INVERSE_POSITION = "inversePosition";
private MessagesComponentHandler messagesComponentHandler;
private PaginationComponentHandler paginationComponentHandler;
public MessagesComponentHandler getMessagesComponentHandler() {
return messagesComponentHandler;
}
public void setMessagesComponentHandler(MessagesComponentHandler messagesComponentHandler) {
this.messagesComponentHandler = messagesComponentHandler;
}
public PaginationComponentHandler getPaginationComponentHandler() {
return paginationComponentHandler;
}
public void setPaginationComponentHandler(PaginationComponentHandler paginationComponentHandler) {
this.paginationComponentHandler = paginationComponentHandler;
}
public void service(HttpServletRequest request, HttpServletResponse response) throws FormatterException {
PaginationContentProvider contentProvider = getPaginationComponentHandler().getContentProvider();
boolean paginationError = false;
int providerLength = 0;
if ((contentProvider != null)) {
providerLength = getPaginationComponentHandler().getCache().getSize();
if ((providerLength > 0)) {
renderFragment("outputStart");
List elements = null;
try {
getPaginationComponentHandler().calculateValues();
elements = contentProvider.getSublist(getPaginationComponentHandler().getElementToStart(), getPaginationComponentHandler().getElementToEnd());
} catch (Exception e) {
log.warn("Error getting elements to paginate: ", e);
paginationError = true;
getMessagesComponentHandler().addError("pagination.error");
renderFragment("outputError");
}
if (elements != null && !paginationError) {
if (paginationComponentHandler.isShowHeader())
renderPaginationHeader(contentProvider, providerLength);
if (contentProvider.getPageHeader() != null) includePage(contentProvider.getPageHeader());
for (int i = 0; i < elements.size(); i++) {
if (contentProvider.getPageForElement() != null) {
setAttribute(PARAM_ELEMENT, elements.get(i));
setAttribute(PARAM_INDEX, i);
int position = (getPaginationComponentHandler().getCurrentPage() - 1) * getPaginationComponentHandler().getPageSize() + i;
setAttribute(PARAM_POSITION, position + 1);
setAttribute(PARAM_INVERSE_POSITION, providerLength - position);
includePage(contentProvider.getPageForElement());
if (i < elements.size() - 1 && contentProvider.getPageSeparator() != null)
includePage(contentProvider.getPageSeparator());
}
}
if (contentProvider.getPageBottom() != null) includePage(contentProvider.getPageBottom());
renderPaginationBottom();
}
renderFragment("outputEnd");
}
}
if (!paginationError && contentProvider != null && providerLength == 0 && contentProvider.getPageEmpty() != null)
includePage(contentProvider.getPageEmpty());
}
protected void renderPaginationHeader(PaginationContentProvider contentProvider, int length) {
boolean useForm = !paginationComponentHandler.isUsedInsideForm();
renderFragment("outputPaginationHeaderStart");
if (useForm) renderFragment("outputPaginationHeaderFormStart");
else renderFragment("outputPaginationHeaderNoFormStart");
for (int i = 0; i < getPaginationComponentHandler().getResultsPerPage().length; i++) {
setAttribute("selected", getPaginationComponentHandler().getResultsPerPage()[i] == getPaginationComponentHandler().getPageSize() ? "selected" : "");
setAttribute("value", getPaginationComponentHandler().getResultsPerPage()[i]);
renderFragment("outputPaginationSizeOption");
}
String results = (getPaginationComponentHandler().getElementToStart() + 1) + "-" + (getPaginationComponentHandler().getElementToEnd());
if (useForm) renderFragment("outputPaginationHeaderFormEnd");
else renderFragment("outputPaginationHeaderNoFormEnd");
setAttribute("resultsShown", results);
setAttribute("totalResults", length);
renderFragment("outputPaginationHeaderEnd");
}
protected void renderPaginationBottom() {
setAttribute("moveLeft", getPaginationComponentHandler().getCurrentPage() != 1);
renderFragment("outputPaginationBottomStart");
int startPage = 1;
int currentPage = getPaginationComponentHandler().getCurrentPage();
int lastPage = getPaginationComponentHandler().calculateLastPage();
if (lastPage > getPaginationComponentHandler().getPagesToShow()) {
int distanceLeft, distanceRight;
if (getPaginationComponentHandler().getPagesToShow() % 2 != 0) {
distanceLeft = (int) Math.floor((double) getPaginationComponentHandler().getPagesToShow() / 2.0);
distanceRight = distanceLeft;
} else {
distanceLeft = getPaginationComponentHandler().getPagesToShow() / 2;
distanceRight = distanceLeft - 1;
}
if (currentPage - distanceLeft < 1) {
while (currentPage - distanceLeft < 1) {
distanceLeft--;
distanceRight++;
}
} else if (currentPage + distanceRight > lastPage) {
while (currentPage + distanceRight > lastPage) {
distanceLeft++;
distanceRight--;
}
}
startPage = currentPage - distanceLeft;
lastPage = currentPage + distanceRight;
}
for (int i = startPage; i <= lastPage; i++) {
setAttribute("npage", i);
setAttribute("selected", i == currentPage);
renderFragment("outputPaginationPage");
}
setAttribute("moveRight", getPaginationComponentHandler().getCurrentPage() < lastPage);
renderFragment("outputPaginationBottomEnd");
}
}