/**
* Copyright (c) 2009 - 2012 Red Hat, Inc.
*
* This software is licensed to you under the GNU General Public License,
* version 2 (GPLv2). There is NO WARRANTY for this software, express or
* implied, including the implied warranties of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
* along with this software; if not, see
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* Red Hat trademarks are not licensed under GPLv2. No permission is
* granted to use or replicate Red Hat trademarks that are incorporated
* in this software or its documentation.
*/
package org.candlepin.resteasy.interceptor;
import org.candlepin.common.exceptions.BadRequestException;
import org.candlepin.paging.PageRequest;
import org.candlepin.paging.PageRequest.Order;
import org.candlepin.paging.Paginate;
import com.google.inject.Inject;
import org.jboss.resteasy.annotations.interception.ServerInterceptor;
import org.jboss.resteasy.core.ResourceMethod;
import org.jboss.resteasy.core.ServerResponse;
import org.jboss.resteasy.spi.Failure;
import org.jboss.resteasy.spi.HttpRequest;
import org.jboss.resteasy.spi.ResteasyProviderFactory;
import org.jboss.resteasy.spi.interception.AcceptedByMethod;
import org.jboss.resteasy.spi.interception.PreProcessInterceptor;
import org.xnap.commons.i18n.I18n;
import java.lang.reflect.Method;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
/**
* DataPresentationInterceptor
*/
@Provider
@ServerInterceptor
public class PageRequestInterceptor implements PreProcessInterceptor,
AcceptedByMethod {
private I18n i18n;
@Inject
public PageRequestInterceptor(I18n i18n) {
super();
this.i18n = i18n;
}
@Override
public boolean accept(Class declaring, Method method) {
return method.isAnnotationPresent(Paginate.class);
}
@Override
public ServerResponse preProcess(HttpRequest request, ResourceMethod method)
throws Failure, WebApplicationException {
PageRequest p = null;
MultivaluedMap<String, String> params = request.getUri().getQueryParameters();
String page = params.getFirst(PageRequest.PAGE_PARAM);
String perPage = params.getFirst(PageRequest.PER_PAGE_PARAM);
String order = params.getFirst(PageRequest.ORDER_PARAM);
String sortBy = params.getFirst(PageRequest.SORT_BY_PARAM);
if (page != null || perPage != null || order != null || sortBy != null) {
p = new PageRequest();
if (order == null) {
p.setOrder(PageRequest.DEFAULT_ORDER);
}
else {
p.setOrder(readOrder(order));
}
/* We'll leave it to the curator layer to figure out what to sort by if
* sortBy is null. */
p.setSortBy(sortBy);
try {
if (page == null && perPage != null) {
p.setPage(PageRequest.DEFAULT_PAGE);
p.setPerPage(readInteger(perPage));
}
else if (page != null && perPage == null) {
p.setPage(readInteger(page));
p.setPerPage(PageRequest.DEFAULT_PER_PAGE);
}
else {
p.setPage(readInteger(page));
p.setPerPage(readInteger(perPage));
}
}
catch (NumberFormatException nfe) {
throw new BadRequestException(i18n.tr("offset and limit parameters" +
" must be positive integers"), nfe);
}
}
ResteasyProviderFactory.pushContext(PageRequest.class, p);
return null;
}
private Order readOrder(String order) {
if ("ascending".equalsIgnoreCase(order) || "asc".equalsIgnoreCase(order)) {
return Order.ASCENDING;
}
else if ("descending".equalsIgnoreCase(order) || "desc".equalsIgnoreCase(order)) {
return Order.DESCENDING;
}
throw new BadRequestException(i18n.tr("the order parameter must be either" +
" 'ascending' or 'descending'"));
}
private Integer readInteger(String value) {
if (value != null) {
int i = Integer.parseInt(value);
if (i <= 0) {
throw new NumberFormatException(i18n.tr("Expected a positive integer."));
}
return i;
}
return null;
}
}