/*******************************************************************************
* Copyright (c) 2001-2005 Sasa Markovic and Ciaran Treanor.
* Copyright (c) 2011 The OpenNMS Group, Inc.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************/
package org.jrobin.core;
import java.io.IOException;
class RrdString extends RrdPrimitive {
private String cache;
RrdString(final RrdUpdater updater, final boolean isConstant) throws IOException {
super(updater, RrdPrimitive.RRD_STRING, isConstant);
}
RrdString(final RrdUpdater updater) throws IOException {
this(updater, false);
}
void set(final String value) throws IOException {
if (!isCachingAllowed()) {
writeString(value);
}
// caching allowed
else if (cache == null || !cache.equals(value)) {
// update cache
writeString(cache = value);
}
}
String get() throws IOException {
return (cache != null) ? cache : readString();
}
}