PListener.cxx

//==============================================================================
// File:        PListener.cxx
//
// Copyright (c) 2017, Phil Harvey, Queen's University
//==============================================================================
#include <stdio.h>
#include <stdlib.h>
#include "PListener.h"
#include "PSpeaker.h"

const int kListInc = 10;

PListener::PListener()
{
    mIgnoring = 0;
    mSpeakers = (PSpeaker **)0;
    mNumSpeakers = 0;
    mMaxSpeakers = 0;
}

PListener::~PListener()
{
    while (mNumSpeakers) {
        mSpeakers[0]->RemoveListener(this);
    }
    delete [] mSpeakers;
}

void PListener::AddSpeaker(PSpeaker *aSpeaker) 
{
    int i;
    
    // don't add a speaker twice
    for (i=0; i<mNumSpeakers; ++i) {
        if (aSpeaker == mSpeakers[i]) return;
    }
    /* add speaker to this listener's list */
    if (mNumSpeakers >= mMaxSpeakers) {
        PSpeaker **tmp = new PSpeaker*[mMaxSpeakers + kListInc];
        if (!tmp) {
            fprintf(stderr,"Out of memory in PListener::AddSpeaker\n");
            exit(1);
        }
        for (i=0; i<mNumSpeakers; ++i) tmp[i] = mSpeakers[i];
        delete [] mSpeakers;
        mSpeakers = tmp;
        mMaxSpeakers += kListInc;
    }
    mSpeakers[mNumSpeakers++] = aSpeaker;
}

void PListener::RemoveSpeaker(PSpeaker *aSpeaker)
{
    for (int i=0; i<mNumSpeakers; ++i) {
        if (aSpeaker == mSpeakers[i]) {
            for (int j=i+1; j<mNumSpeakers; ++j) {
                mSpeakers[j-1] = mSpeakers[j];
            }
            --mNumSpeakers;
        }
    }
}