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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.data.cache;
import java.io.IOException;
import java.io.Serializable;
import net.sf.jasperreports.engine.JRConstants;
/**
* @author Lucian Chirita ([email protected])
*/
public class RunLengthColumnValues implements ColumnValues, Serializable
{
private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;
private int size;
private ColumnValues values;
private ColumnValues runLengths;
public RunLengthColumnValues(int size, ColumnValues values,
ColumnValues runLengths)
{
if (values.size() != runLengths.size())
{
throw new IllegalArgumentException();
}
this.size = size;
this.values = values;
this.runLengths = runLengths;
}
private void writeObject(java.io.ObjectOutputStream out) throws IOException
{
out.writeInt(size);
out.writeUnshared(values);
out.writeUnshared(runLengths);
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException
{
this.size = in.readInt();
this.values = (ColumnValues) in.readUnshared();
this.runLengths = (ColumnValues) in.readUnshared();
}
@Override
public int size()
{
return size;
}
@Override
public ColumnValuesIterator iterator()
{
ColumnValuesIterator valuesIterator = values.iterator();
ColumnValuesIterator lengthsIterator = runLengths.iterator();
return new RunLengthIterator(valuesIterator, lengthsIterator);
}
}
class RunLengthIterator implements ColumnValuesIterator
{
private final ColumnValuesIterator values;
private final ColumnValuesIterator lengths;
private int currentCount;
private Object currentValue;
public RunLengthIterator(ColumnValuesIterator values,
ColumnValuesIterator lengths)
{
this.values = values;
this.lengths = lengths;
currentCount = 0;
currentValue = null;
}
@Override
public void moveFirst()
{
values.moveFirst();
lengths.moveFirst();
currentCount = 0;
currentValue = null;
}
@Override
public boolean next()
{
if (currentCount > 1)
{
--currentCount;
return true;
}
if (!lengths.next())
{
return false;
}
if (!values.next())
{
throw new IllegalStateException();
}
currentCount = ((Number) lengths.get()).intValue();
currentValue = values.get();
return true;
}
@Override
public Object get()
{
return currentValue;
}
}