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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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author Lucian Chirita ([email protected])
*/
public class LongArrayStore implements BufferColumnStore, ArrayStore
{
private static final Log log = LogFactory.getLog(LongArrayStore.class);
private final boolean useGCD;
private final ValueTransformer valueTransformer;
private final long[] values;
private int count;
private long min;
private long max;
private RunLengthStore runLengthStore;
public LongArrayStore(int size)
{
this(size, null, false);
}
public LongArrayStore(int size, ValueTransformer valueTransformer)
{
this(size, valueTransformer, false);
}
public LongArrayStore(int size, boolean useGCD)
{
this(size, null, useGCD);
}
@Override
public Class getBaseValuesType()
{
return valueTransformer == null ? Number.class : valueTransformer.getResultType();
}
public LongArrayStore(int size, ValueTransformer valueTransformer, boolean useGCD)
{
this.useGCD = useGCD;
this.valueTransformer = valueTransformer;
this.values = new long[size];
this.runLengthStore = new RunLengthStore(this);
reset();
}
private void reset()
{
this.count = 0;
this.min = Long.MAX_VALUE;
this.max = Long.MIN_VALUE;
this.runLengthStore.reset();
}
@Override
public int count()
{
return count;
}
@Override
public boolean valuesEqual(int idx1, int idx2)
{
return values[idx1] == values[idx2];
}
@Override
public void copyValue(int destIdx, int sourceIdx)
{
values[destIdx] = values[sourceIdx];
}
@Override
public void updateCount(int count)
{
this.count = count;
}
public void add(long value)
{
values[count] = value;
++count;
if (value < min)
{
min = value;
}
if (value > max)
{
max = value;
}
runLengthStore.valueAdded();
}
@Override
public void addValue(Object value)
{
if (value instanceof Integer
|| value instanceof Long
|| value instanceof Byte
|| value instanceof Short)
{
add(((Number) value).longValue());
}
else if (value instanceof Character)
{
add(((Character) value).charValue());
}
else
{
throw new IllegalArgumentException();
}
}
@Override
public boolean full()
{
return count >= values.length;
}
@Override
public void resetValues()
{
reset();
}
@Override
public ColumnValues createValues()
{
if (count == 0)
{
// no values
if (log.isDebugEnabled())
{
log.debug(this + ": no values");
}
return EmptyColumnValues.instance();
}
if (min == max)
{
// constant value
if (log.isDebugEnabled())
{
log.debug(this + ": constant value of size " + count);
}
//FIXME keep value as primitive?
// transform the value so that we don't need to store the transformer
Object value = valueTransformer == null ? min : valueTransformer.get(min);
return new ConstantColumnValue(count, value);
}
long linearOffset = 0;
long linearFactor = 1;
if (min != 0)
{
linearOffset = min;
if (log.isDebugEnabled())
{
log.debug(this + ": using offset " + linearOffset);
}
// apply min
for (int i = 0; i < count; i++)
{
values[i] -= linearOffset;
}
min = 0;
max -= linearOffset;
}
if (useGCD)
{
long gcd = computeGCD();
if (gcd > 1)
{
if (log.isDebugEnabled())
{
log.debug(this + ": using factor " + gcd);
}
for (int i = 0; i < count; i++)
{
values[i] /= gcd;
}
max /= gcd;
linearFactor = gcd;
}
}
int originalCount = count;
ValueLength valueLength = ValueLength.getNumberLength(max);
ColumnValues runLengthValues = runLengthStore.applyRunLengths(valueLength);
if (log.isDebugEnabled())
{
log.debug(this + ": creating values of count " + count + ", value length " + valueLength);
}
ColumnValues colValues = NumberValuesUtils.instance().toValues(count, values, valueLength, linearFactor, linearOffset);
if (valueTransformer != null)
{
colValues = new TransformedColumnValues(colValues, valueTransformer);
}
ColumnValues finalValues;
if (runLengthValues == null)
{
finalValues = colValues;
}
else
{
finalValues = new RunLengthColumnValues(originalCount, colValues, runLengthValues);
}
return finalValues;
}
protected long computeGCD()
{
long gcd = values[0] - min;
for (int i = 1; i < count; i++)
{
gcd = gcd(gcd, values[i] - min);
if (gcd == 1)
{
return gcd;
}
}
return gcd;
}
private static long gcd(long a, long b)
{
if (b == 0)
{
return a;
}
while (a > 0)
{
long t = a;
a = b % a;
b = t;
}
return b;
}
@Override
public String toString()
{
return "LongArrayStore@" + hashCode();
}
}