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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2022 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.engine.util;
import java.util.Collection;
import java.util.concurrent.atomic.AtomicInteger;
import net.sf.jasperreports.engine.JRPrintElement;
import net.sf.jasperreports.engine.JRPrintFrame;
/**
* Print element visitor that counts deep elements by recursively visiting
* {@link JRPrintFrame} containers.
*
* @author Lucian Chirita ([email protected])
*/
//we need a mutable integer argument, using AtomicInteger
public class DeepPrintElementCounter extends UniformPrintElementVisitor
{
private static final DeepPrintElementCounter INSTANCE = new DeepPrintElementCounter();
/**
* Calculates the deep element count of an element.
*
* @param element
* @return the deep element count of the element
*/
public static int count(JRPrintElement element)
{
return count(element, INSTANCE);
}
protected static int count(JRPrintElement element, UniformPrintElementVisitor counter)
{
if (element == null)
{
return 0;
}
AtomicInteger count = new AtomicInteger(0);
element.accept(counter, count);
return count.get();
}
public static int count(Collection elements)
{
return count(elements, INSTANCE);
}
protected static int count(Collection elements,
UniformPrintElementVisitor counter)
{
if (elements == null || elements.isEmpty())
{
return 0;
}
AtomicInteger count = new AtomicInteger(0);
for (JRPrintElement element : elements)
{
element.accept(counter, count);
}
return count.get();
}
protected DeepPrintElementCounter()
{
super(true);
}
@Override
protected void visitElement(JRPrintElement element, AtomicInteger count)
{
count.incrementAndGet();
}
}