net.sf.jasperreports.export.CompositeExporterConfigurationFactory Maven / Gradle / Ivy
/*
* 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.export;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;
import net.sf.jasperreports.engine.JRPropertiesUtil;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.engine.util.ClassUtils;
/**
* @author Teodor Danciu ([email protected])
*/
public class CompositeExporterConfigurationFactory
{
/**
*
*/
private final JRPropertiesUtil propertiesUtil;
private final Class configurationInterface;
/**
*
*/
public CompositeExporterConfigurationFactory(JasperReportsContext jasperReportsContext, Class configurationInterface)
{
this.propertiesUtil = JRPropertiesUtil.getInstance(jasperReportsContext);
this.configurationInterface = configurationInterface;
}
/**
*
*/
public C getConfiguration(final C parent, final C child)
{
if (parent == null)
{
return child;
}
else
{
boolean isOverrideHints =
parent.isOverrideHints() == null
? propertiesUtil.getBooleanProperty(ExporterConfiguration.PROPERTY_EXPORT_CONFIGURATION_OVERRIDE_REPORT_HINTS)
: parent.isOverrideHints();
return getConfiguration(parent, child, isOverrideHints);
}
}
/**
*
*/
public C getConfiguration(final C parent, final C child, boolean isOverrideHints)
{
if (parent == null)
{
return child;
}
else
{
if (isOverrideHints)
{
return getProxy(configurationInterface, new DelegateInvocationHandler(child, parent));
}
else
{
return getProxy(configurationInterface, new DelegateInvocationHandler(parent, child));
}
}
}
/**
*
*/
private final C getProxy(Class clazz, InvocationHandler handler)
{
List> allInterfaces = new ArrayList>();
if (clazz.isInterface())
{
allInterfaces.add(clazz);
}
else
{
List> lcInterfaces = ClassUtils.getInterfaces(clazz);
allInterfaces.addAll(lcInterfaces);
}
@SuppressWarnings("unchecked")
C composite =
(C)Proxy.newProxyInstance(
ExporterConfiguration.class.getClassLoader(),
allInterfaces.toArray(new Class[allInterfaces.size()]),
handler
);
return composite;
}
/**
*
*/
class DelegateInvocationHandler implements InvocationHandler
{
private final C parent;
private final C child;
/**
*
*/
public DelegateInvocationHandler(final C parent, final C child)
{
this.parent = parent;
this.child = child;
}
@Override
public Object invoke(
Object proxy,
Method method,
Object[] args
) throws Throwable
{
Object value = child == null ? null : method.invoke(child, args);
if (value == null)
{
value = parent == null ? null : method.invoke(parent, args);
}
return value;
}
}
}