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A Paradox Java Driver (using JDBC 4)

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/*
 * Copyright (c) 2009 Leonardo Alves da Costa
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. This program 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 General Public
 * License for more details. You should have received a copy of the GNU General Public License along with this
 * program. If not, see .
 */
package com.googlecode.paradox.function.aggregate.context;

import com.googlecode.paradox.ConnectionInfo;
import com.googlecode.paradox.function.aggregate.IGroupingContext;

import java.math.BigDecimal;
import java.math.RoundingMode;

/**
 * AVG context.
 *
 * @version 1.2
 * @since 1.6.0
 */
public class AvgContext implements IGroupingContext {

    private BigDecimal value;

    private int total = 1;

    /**
     * Creates a new instance.
     *
     * @param value the amount to count.
     */
    public AvgContext(final BigDecimal value) {
        this.value = value;
    }

    @Override
    public void process(final IGroupingContext context, final ConnectionInfo connectionInfo) {
        final AvgContext current = (AvgContext) context;
        if (current != null) {
            this.total += current.total;
            if (this.value == null) {
                this.value = current.value;
            } else if (current.value != null) {
                this.value = this.value.add(current.value);
            }
        }
    }

    @Override
    public BigDecimal toValue() {
        if (this.value != null && total != 0) {
            return value.divide(BigDecimal.valueOf(total), RoundingMode.FLOOR);
        }

        return null;
    }

    @Override
    public String toString() {
        return value.toString();
    }
}