net.sf.jasperreports.data.cache.BigIntegerStore Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2016 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.math.BigInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author Lucian Chirita ([email protected])
*/
public class BigIntegerStore implements BufferColumnStore
{
private static final Log log = LogFactory.getLog(BigIntegerStore.class);
private final ObjectArrayStore rawStore;
private BigInteger min;
private BigInteger max;
private LongArrayStore primitiveStore;
public BigIntegerStore(int size)
{
this.rawStore = new ObjectArrayStore(BigInteger.class, size);
reset();
if (log.isDebugEnabled())
{
log.debug("created object store " + rawStore + " for " + this);
}
}
private void reset()
{
this.rawStore.resetValues();
this.min = BigInteger.valueOf(Long.MAX_VALUE);
this.max = BigInteger.valueOf(Long.MIN_VALUE);
}
@Override
public Class getBaseValuesType()
{
return BigInteger.class;
}
@Override
public void addValue(Object object)
{
if (!(object instanceof BigInteger))
{
throw new IllegalArgumentException();
}
BigInteger value = (BigInteger) object;
rawStore.addValue(value);
min = min.min(value);
max = max.max(value);
}
@Override
public boolean full()
{
return rawStore.full();
}
@Override
public void resetValues()
{
reset();
}
@Override
public ColumnValues createValues()
{
int count = rawStore.count();
if (count == 0)
{
// no values
if (log.isDebugEnabled())
{
log.debug(this + ": empty values");
}
return EmptyColumnValues.instance();
}
if (min.equals(max))
{
// constant value
if (log.isDebugEnabled())
{
log.debug(this + ": constant values of size " + count);
}
return new ConstantColumnValue(count, min);
}
BigInteger delta = max.subtract(min);
int deltaLength = delta.bitLength();
boolean useOffset = false;
ColumnValues primitiveValues = null;
if (deltaLength < 64)// bitLength() excludes the sign
{
// if all values can be stored as long, do not use a BigInteger offset
useOffset = !(min.signum() >= 0 && min.bitLength() < 64
&& max.signum() >=0 && max.bitLength() < 64);
if (log.isDebugEnabled())
{
log.debug(this + ": creating privitive store of size " + count
+ ", with offset " + useOffset);
}
primitiveValues = createPrimitiveValues(useOffset);
}
ColumnValues columnValues;
if (primitiveValues == null)
{
if (log.isDebugEnabled())
{
log.debug(this + ": creating raw array store of size " + count);
}
return rawStore.createValues();
}
else
{
ValueTransformer transformer = useOffset
? new NumberToBigIntegerOffsetTransformer(min)
: NumberToBigIntegerTransformer.instance();
columnValues = new TransformedColumnValues(primitiveValues, transformer);
}
return columnValues;
}
protected ColumnValues createPrimitiveValues(boolean useOffset)
{
if (primitiveStore == null)
{
primitiveStore = new LongArrayStore(rawStore.size(), true);
}
else
{
primitiveStore.resetValues();
}
int count = rawStore.count();
Object[] values = rawStore.valuesBuffer();
for (int i = 0; i < count; i++)
{
BigInteger value = (BigInteger) values[i];
if (useOffset)
{
value = value.subtract(min);
}
primitiveStore.add(value.longValue());
}
ColumnValues primitiveValues = primitiveStore.createValues();
return primitiveValues;
}
@Override
public String toString()
{
return "BigIntegerStore@" + hashCode();
}
}