/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.file.collectors;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsProperty;
import org.opencms.file.CmsResource;
import org.opencms.main.CmsException;
import org.opencms.util.CmsUUID;
import java.io.Serializable;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Comparator for sorting resource objects based on priority and date.<p>
*
* Serves as {@link java.util.Comparator} for resources and as comparator key for the resource
* at the same time. Uses lazy initializing of comparator keys in a resource.<p>
*
* @since 6.0.0
*/
public class CmsPriorityDateResourceComparator implements Serializable, Comparator<CmsResource> {
/** The name of the date property to read. */
public static final String PROPERTY_DATE = "collector.date";
/** Serial version UID required for safe serialization. */
private static final long serialVersionUID = 5316136357328564518L;
/** The date sort order. */
private boolean m_asc;
/** The current OpenCms user context. */
private transient CmsObject m_cms;
/** The date of this comparator key. */
private long m_date;
/** The internal map of comparator keys. */
private Map<CmsUUID, CmsPriorityDateResourceComparator> m_keys;
/** The priority of this comparator key. */
private int m_priority;
/**
* Creates a new instance of this comparator key.<p>
*
* @param cms the current OpenCms user context
* @param asc if true, the date sort order is ascending, otherwise descending
*/
public CmsPriorityDateResourceComparator(CmsObject cms, boolean asc) {
m_cms = cms;
m_asc = asc;
m_keys = new HashMap<CmsUUID, CmsPriorityDateResourceComparator>();
}
/**
* Creates a new instance of this comparator key.<p>
*
* @param resource the resource to create the key for
* @param cms the current OpenCms user context
*
* @return a new instance of this comparator key
*/
private static CmsPriorityDateResourceComparator create(CmsResource resource, CmsObject cms) {
CmsPriorityDateResourceComparator result = new CmsPriorityDateResourceComparator(null, false);
result.init(resource, cms);
return result;
}
/**
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(CmsResource res0, CmsResource res1) {
if (res0 == res1) {
return 0;
}
CmsPriorityDateResourceComparator key0 = m_keys.get(res0.getStructureId());
CmsPriorityDateResourceComparator key1 = m_keys.get(res1.getStructureId());
if (key0 == null) {
// initialize key if null
key0 = CmsPriorityDateResourceComparator.create(res0, m_cms);
m_keys.put(res0.getStructureId(), key0);
}
if (key1 == null) {
// initialize key if null
key1 = CmsPriorityDateResourceComparator.create(res1, m_cms);
m_keys.put(res1.getStructureId(), key1);
}
// check priority
if (key0.getPriority() > key1.getPriority()) {
return -1;
}
if (key0.getPriority() < key1.getPriority()) {
return 1;
}
if (m_asc) {
// sort in ascending order
if (key0.getDate() > key1.getDate()) {
return 1;
}
if (key0.getDate() < key1.getDate()) {
return -1;
}
} else {
// sort in descending order
if (key0.getDate() > key1.getDate()) {
return -1;
}
if (key0.getDate() < key1.getDate()) {
return 1;
}
}
return 0;
}
/**
* Returns the date of this resource comparator key.<p>
*
* @return the date of this resource comparator key
*/
public long getDate() {
return m_date;
}
/**
* Returns the priority of this resource comparator key.<p>
*
* @return the priority of this resource comparator key
*/
public int getPriority() {
return m_priority;
}
/**
* Initializes the comparator key based on the member variables.<p>
*
* @param resource the resource to use
* @param cms the current OpenCms user contxt
*/
private void init(CmsResource resource, CmsObject cms) {
List<CmsProperty> properties;
try {
properties = cms.readPropertyObjects(resource, false);
} catch (CmsException e) {
m_priority = 0;
m_date = 0;
return;
}
try {
m_priority = Integer.parseInt(CmsProperty.get(CmsPriorityResourceCollector.PROPERTY_PRIORITY, properties).getValue());
} catch (NumberFormatException e) {
m_priority = CmsPriorityResourceCollector.PRIORITY_STANDARD;
}
try {
m_date = Long.parseLong(CmsProperty.get(PROPERTY_DATE, properties).getValue());
} catch (NumberFormatException e) {
m_date = 0;
}
}
}