/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Mar 13, 2008
*/
package com.bigdata.counters;
/**
* A named counter.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan
* Thompson</a>
* @version $Id$
*
* @param <T>
* The data type for the counter value.
*/
final class Counter<T> implements ICounter {
ICounterSet parent;
private final String name;
private final IInstrument<T> instrument;
Counter(ICounterSet parent, String name, IInstrument<T> instrument) {
if (parent == null)
throw new IllegalArgumentException();
if (name == null)
throw new IllegalArgumentException();
if (instrument == null)
throw new IllegalArgumentException();
this.parent = parent;
this.name = name;
this.instrument = instrument;
}
public ICounterSet getParent() {
return parent;
}
public String getName() {
return name;
}
public String getPath() {
if(parent.isRoot()) {
/*
* Handles: "/foo", where "foo" is this counter.
*/
return parent.getPath()+name;
}
// Handles all other cases.
return parent.getPath() + ICounterSet.pathSeparator + name;
}
public int getDepth() {
int depth = 0;
ICounterNode t = this;
while(!t.isRoot()) {
t = t.getParent();
depth++;
}
return depth;
}
public String toString() {
return getPath();
}
public ICounterSet getRoot() {
return parent.getRoot();
}
public boolean isRoot() {
return false;
}
/**
* Invokes {@link Instrument#getValue()}
*/
public T getValue() {
return instrument.getValue();
}
/**
* Invokes {@link Instrument#setValue(Object, long)}.
*/
public void setValue(Object value, long timestamp) {
instrument.setValue((T)value, timestamp);
}
/**
* Invokes {@link Instrument#lastModified()}
*/
public long lastModified() {
return instrument.lastModified();
}
/**
* Returns <code>false</code>.
*/
final public boolean isCounterSet() {
return false;
}
/**
* Returns <code>true</code>
*/
final public boolean isCounter() {
return true;
}
/**
* Always returns <code>null</code> since there are no children.
*/
public ICounterNode getChild(String name) {
return null;
}
/**
* Always returns <code>null</code> since there are no children.
*/
public ICounterNode getPath(String path) {
return null;
}
public IInstrument<T> getInstrument() {
return instrument;
}
}