rrddoublearray.java

jrobin,使用纯java实现的RRD数据库,使用RRD数据库来统计数据.

/* ============================================================
 * JRobin : Pure java implementation of RRDTool's functionality
 * ============================================================
 *
 * Project Info:  http://www.jrobin.org
 * Project Lead:  Sasa Markovic ([e-mail]);
 *
 * (C) Copyright 2003-2005, by Sasa Markovic.
 *
 * Developers:    Sasa Markovic ([e-mail])
 *
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package org.jrobin.core;

import java.io.IOException;

class RrdDoubleArray extends RrdPrimitive {
	private int length;

	RrdDoubleArray(RrdUpdater updater, int length) throws IOException {
		super(updater, RrdPrimitive.RRD_DOUBLE, length, false);
		this.length = length;
	}

	void set(int index, double value) throws IOException {
		set(index, value, 1);
	}

	void set(int index, double value, int count) throws IOException {
		// rollovers not allowed!
		assert index + count <= length:	"Invalid robin index supplied: index=" + index +
				", count=" + count + ", length=" + length;
		writeDouble(index, value, count);
	}

	double get(int index) throws IOException {
		assert index < length: "Invalid index supplied: " + index + ", length=" + length;
		return readDouble(index);
	}

	double[] get(int index, int count) throws IOException {
		assert index + count <= length: "Invalid index/count supplied: " + index +
				"/" + count + " (length=" + length + ")";
		return readDouble(index, count);
	}

}