CounterMap.java

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package com.arcle.rmt.j2se.util;

import java.util.Map;
import java.util.Hashtable;
import com.arcle.rmt.xplat.util.MutableInteger;

public class CounterMap {

    public int getCounter(Object key) {
        // returns the value of the MutableInteger
        return doGetCounter(key).value;
    }

    public int incrementCounter(Object key) {
        MutableInteger value = doGetCounter(key);
        doIncrementCounter(value);
        return value.value;
    }

    //-----------------------------------------------------------------------
    // Strategy methods

    protected void doIncrementCounter(MutableInteger counter) {
        counter.value++;
    }


    protected int doGetInitialCounterValue() {
        return 0;
    }

    protected MutableInteger doGetCounter(Object key) {
        Map m = getCounters();
        MutableInteger value = (MutableInteger) m.get(key);
        if (value == null) {
            value = createMutableInteger(doGetInitialCounterValue());
            m.put(key, value);
        }
        return value;
    }

    //-----------------------------------------------------------------------
    // Accessor methods

    protected Map getCounters() {
        if (_counters == null) {
            _counters = createCounters();
        }
        return _counters;
    }

    //-----------------------------------------------------------------------
    // Factory methods

    protected MutableInteger createMutableInteger(int init) {
        return new MutableInteger(init);
    }

    protected Map createCounters() {
        return new Hashtable();
    }

    //-----------------------------------------------------------------------
    // Member variables.

    private Map _counters = null;
}

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