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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.extensions;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.collections4.map.ReferenceMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.ListableBeanFactory;
/**
* An {@link ExtensionsRegistry extension registry} which works by looking
* for beans of a specific extension type in a Spring beans factory.
*
* @author Lucian Chirita ([email protected])
*/
//TODO generic element fallback handlers
public class SpringExtensionsRegistry implements ExtensionsRegistry
{
private static final Log log = LogFactory.getLog(SpringExtensionsRegistry.class);
private final ListableBeanFactory beanFactory;
private final ReferenceMap, String[]> extensionBeanNamesCache =
new ReferenceMap, String[]>(
ReferenceMap.ReferenceStrength.WEAK, ReferenceMap.ReferenceStrength.HARD
);
/**
* Creates a Spring-based extension registry.
*
* @param beanFactory the Spring bean factory
*/
public SpringExtensionsRegistry(ListableBeanFactory beanFactory)
{
this.beanFactory = beanFactory;
}
/**
* Returns all beans that match the extension class.
*/
@Override
public List getExtensions(Class extensionType)
{
String[] beanNames = getExtensionBeanNames(extensionType);
List beans = new ArrayList(beanNames.length);
for (int i = 0; i < beanNames.length; i++)
{
String name = beanNames[i];
if (log.isDebugEnabled())
{
log.debug("Getting bean " + name + " as extension of type "
+ extensionType.getName());
}
T bean = beanFactory.getBean(name, extensionType);
beans.add(bean);
}
return beans;
}
protected String[] getExtensionBeanNames(Class extensionType)
{
String[] beanNames;
synchronized (extensionBeanNamesCache)
{
beanNames = extensionBeanNamesCache.get(extensionType);
}
if (beanNames == null)
{
// can be executed concurrently
beanNames = findExtensionBeanNames(extensionType);
synchronized (extensionBeanNamesCache)
{
// checking again
if (extensionBeanNamesCache.get(extensionType) == null)
{
extensionBeanNamesCache.put(extensionType, beanNames);
}
}
}
return beanNames;
}
protected String[] findExtensionBeanNames(Class extensionType)
{
String[] beanNames = beanFactory.getBeanNamesForType(extensionType);
if (log.isDebugEnabled())
{
log.debug("Found " + beanNames.length + " beans for extension type " + extensionType);
}
return beanNames;
}
}