// BlogBridge -- RSS feed reader, manager, and web based service
// Copyright (C) 2002-2006 by R. Pito Salas
//
// This program is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software Foundation;
// either version 2 of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with this program;
// if not, write to the Free Software Foundation, Inc., 59 Temple Place,
// Suite 330, Boston, MA 02111-1307 USA
//
// Contact: R. Pito Salas
// mailto:pitosalas@users.sourceforge.net
// More information: about BlogBridge
// http://www.blogbridge.com
// http://sourceforge.net/projects/blogbridge
//
// $Id: Query.java,v 1.20 2008/02/28 09:58:33 spyromus Exp $
//
package com.salas.bb.domain.query.articles;
import com.salas.bb.domain.query.BasicQuery;
import com.salas.bb.domain.query.IComparisonOperation;
import com.salas.bb.domain.query.ICriteria;
import com.salas.bb.domain.query.IProperty;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Query for <code>IArticle</code> objects.
*/
public class Query extends BasicQuery
{
private static final Pattern PAT_TOP_QUERY =
Pattern.compile("^(true|false);(.+;)?$");
private static final Pattern PAT_CRITERIA =
Pattern.compile("(([^:]+):([^:]+):(([^\\\\;]|\\\\(;|\\\\))*));");
/**
* Creates query.
*/
public Query()
{
super(new IProperty[]
{
EntireArticleTextProperty.INSTANCE,
ArticleCategoryProperty.INSTANCE,
ArticleDateProperty.INSTANCE,
ArticleFlagProperty.INSTANCE,
ArticleStatusProperty.INSTANCE,
ArticleSentimentsProperty.INSTANCE,
ArticleTagsProperty.INSTANCE,
ArticleTextProperty.INSTANCE,
ArticleTitleProperty.INSTANCE,
FeedTagsProperty.INSTANCE,
FeedTitleProperty.INSTANCE,
FeedStarzProperty.INSTANCE,
GuideTitleProperty.INSTANCE
});
}
/**
* Creates complete clone which includes And/Or flag and all criteria rows.
*
* @return complete clone.
*/
public Query getClone()
{
Query cloneQuery = new Query();
cloneQuery.setAndQuery(isAndQuery());
int criteriaCount = getCriteriaCount();
for (int i = 0; i < criteriaCount; i++)
{
ICriteria criteria = getCriteriaAt(i);
ICriteria cloneCriteria = cloneQuery.addCriteria();
cloneCriteria.setProperty(criteria.getProperty());
cloneCriteria.setComparisonOperation(criteria.getComparisonOperation());
cloneCriteria.setValue(criteria.getValue());
}
return cloneQuery;
}
// ---------------------------------------------------------------------------------------------
// Serialization / Deserialization
// ---------------------------------------------------------------------------------------------
public String serializeToString()
{
StringBuffer buf = new StringBuffer();
buf.append(isAndQuery()).append(";");
int criteriaCount = getCriteriaCount();
for (int i = 0; i < criteriaCount; i++)
{
ICriteria criteria = getCriteriaAt(i);
String serializedCriteria = serializeToString(criteria);
buf.append(serializedCriteria).append(";");
}
return buf.toString();
}
private String serializeToString(ICriteria aCriteria)
{
IProperty property = aCriteria.getProperty();
IComparisonOperation operation = aCriteria.getComparisonOperation();
String value = aCriteria.getValue();
StringBuffer buf = new StringBuffer();
buf.append(property.getDescriptor()).append(':');
buf.append(operation.getDescriptor()).append(':');
buf.append(escapeValue(value));
return buf.toString();
}
public static Query deserializeFromString(String serializedVersion)
{
Matcher matcher = PAT_TOP_QUERY.matcher(serializedVersion);
Query query = null;
if (matcher.find())
{
String andQueryString = matcher.group(1);
String criteriaItems = matcher.group(2);
query = new Query();
query.setAndQuery(Boolean.valueOf(andQueryString).booleanValue());
if (criteriaItems != null)
{
Matcher criteriaMatcher = PAT_CRITERIA.matcher(criteriaItems);
while (criteriaMatcher.find())
{
String property = criteriaMatcher.group(2);
String operation = criteriaMatcher.group(3);
String value = criteriaMatcher.group(4);
addCriteria(query, property, operation, value);
}
}
}
return query;
}
static void addCriteria(Query aQuery, String propertyDescriptor,
String operationDescriptor, String value)
{
IProperty property = aQuery.getPropertyByDescriptor(propertyDescriptor);
if (property != null)
{
IComparisonOperation operation =
property.getComparsonOperationByDescriptor(operationDescriptor);
if (operation != null)
{
ICriteria criteria = aQuery.addCriteria();
criteria.setProperty(property);
criteria.setComparisonOperation(operation);
criteria.setValue(unescapeValue(value));
}
}
}
public static String escapeValue(String aValue)
{
aValue = aValue.replaceAll("\\\\", "\\\\\\\\");
aValue = aValue.replaceAll("\\;", "\\\\;");
return aValue;
}
public static String unescapeValue(String aValue)
{
aValue = aValue.replaceAll("\\\\\\\\", "\\\\");
aValue = aValue.replaceAll("\\\\;", "\\;");
return aValue;
}
}