net.sf.jasperreports.data.cache.BigIntegerStore.java Source code

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Here is the source code for net.sf.jasperreports.data.cache.BigIntegerStore.java

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/*
 * 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 <http://www.gnu.org/licenses/>.
 */
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 (lucianc@users.sourceforge.net)
 */
public class BigIntegerStore implements BufferColumnStore {

    private static final Log log = LogFactory.getLog(BigIntegerStore.class);

    private final ObjectArrayStore<BigInteger> rawStore;

    private BigInteger min;
    private BigInteger max;

    private LongArrayStore primitiveStore;

    public BigIntegerStore(int size) {
        this.rawStore = new ObjectArrayStore<BigInteger>(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();
    }
}