ServerScaleManager.java

/* -*- Mode: Java; indent-tabs-mode: t -*- */
/**
 $Id: ServerScaleManager.java,v 1.2 2009/11/10 20:14:32 jpont Exp $
 $Source: /home/cvs/vchill/edu/colostate/vchill/ServerScaleManager.java,v $

 Created on May 14, 2009, 3:38:17 PM

 $Revision: 1.2 $
 */

package edu.colostate.vchill;

import edu.colostate.vchill.chill.ChillMomentFieldScale;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;

/**
 * ServerScaleManager manages scale
 * information for a particular server.
 *
 * @author jpont
 * @version 2009-11-10
 */
public final class ServerScaleManager {
    /**
     * The url (hostname:port) of the server.
     */
    private String serverURL;

    /**
     * Maps field names to field scales.
     */
    private HashMap<String, ChillMomentFieldScale> nameToScaleMap;

    /**
     * Contains the field names according to field number.
     */
    private ArrayList<String> names;

    /**
     * A bitmask containing which fields are available from the server.
     */
    private long availableMask;

    public ServerScaleManager(final String serverURL) {
        this.serverURL = serverURL;
        this.nameToScaleMap = new HashMap<String, ChillMomentFieldScale>();
        this.names = new ArrayList<String>();
        this.availableMask = -1; //all bits initially set
    }

    /**
     * Removes ALL types from the list of known types.
     */
    public synchronized void clear() {
        this.nameToScaleMap.clear();
        this.names.clear();
        this.availableMask = -1; //all bits initially set
    }

    public long getAvailableMask() {
        return this.availableMask;
    }

    public void setAvailableMask(final long available) {
        this.availableMask = available;
    }

    public synchronized ChillMomentFieldScale getScale(final String name) {
        if (name == null)
            return null;

        return this.nameToScaleMap.get(name);
    }

    public synchronized ChillMomentFieldScale getScale(final int number) {
        for (ChillMomentFieldScale scale : this.nameToScaleMap.values()) {
            if (scale.fieldNumber == number)
                return scale;
        }

        return null;
    }

    public synchronized Collection<ChillMomentFieldScale> getScales() {
        return new ArrayList<ChillMomentFieldScale>(this.nameToScaleMap.values());
    }

    public synchronized ArrayList<String> getTypes() {
        return this.names;
    }

    public synchronized void putScale(final ChillMomentFieldScale scale) {
        this.nameToScaleMap.put(scale.fieldName, scale);
        this.names.add(scale.fieldName);
    }

    /**
     * Attempts to remove a type from the list of known types.
     * If that type does not exist, nothing happens.
     */
    public synchronized ChillMomentFieldScale removeScale(final ChillMomentFieldScale scale) {
        this.names.remove(scale.fieldName);
        return this.nameToScaleMap.remove(scale.fieldName);
    }
}