/**
* 卸载ram,如果并没有安装过ram,则什么也不会发生
* @param type 需要卸载的内存类型
*/
public void uninstall(int type)
{
Ram.Ram ram = null;
switch (type)
{
case RamConst.RAM_RUNTIME_TYPE:
ram = runRam;
runRam = null;
break;
case RamConst.RAM_GRAPH_TYPE:
ram = graphRam;
graphRam = null;
break;
case RamConst.RAM_BUFFER_TYPE:
ram = bufferRam;
bufferRam = null;
break;
case RamConst.RAM_STRING_TYPE:
ram = strRam;
strRam = null;
break;
case RamConst.RAM_TEXT_TYPE:
ram = textRam;
textRam = null;
break;
}
if (ram != null)
{
resetRamAddress();
}
}
/**
* 往里面添加内存模块,每种类型的内存最多只能安装一个.<p>
* ram为null不会抛出异常,且不会改变RamManager的任何状态
* @param ram 需要安装的内存
* @throws IllegalStateException 已经安装了这种类型的内存
* @see #uninstall
*/
public void install(Ram.Ram ram)
{
if (ram == null)
{
return;
}
switch (ram.getRamType())
{
case RamConst.RAM_RUNTIME_TYPE:
if (runRam != null)
{
//throw new IllegalStateException("Runtime Ram was installed!");
}
runRam = (RuntimeRam)ram;
break;
case RamConst.RAM_GRAPH_TYPE:
if (graphRam != null)
{
//throw new IllegalStateException("Graph Ram was installed!");
}
graphRam = (RelativeRam)ram;
screen = graphRam.getScreenModel();
break;
case RamConst.RAM_BUFFER_TYPE:
if (bufferRam != null)
{
//throw new IllegalStateException("Buffer Ram was installed!");
}
bufferRam = (RelativeRam)ram;
break;
case RamConst.RAM_STRING_TYPE:
if (strRam != null)
{
//throw new IllegalStateException("String Ram was installed!");
}
strRam = (StringRam)ram;
break;
case RamConst.RAM_TEXT_TYPE:
if (textRam != null)
{
//throw new IllegalStateException("Text Ram was installed!");
}
textRam = (RelativeRam)ram;
break;
}
resetRamAddress();
}
/**
* 读取指定内存地址一字节数据,并以byte返回
* @param addr 地址
* @return byte数据
*/
public sbyte getByte(int addr)
{
//Notice: 该实现与resetRamAddress的实现方式有关
if (addr >= runRam.getStartAddr())
{
return(runRam.getByte(addr));
}
if (addr >= strRam.getStartAddr())
{
return(strRam.getByte(addr));
}
for (int index = ramCount - 1; index >= 0; index--)
{
Ram.Ram ram = rams[index];
if (addr >= ram.getStartAddr())
{
return(ram.getByte(addr));
}
}
return(-1);
//throw new IndexOutOfBoundsException("内存读越界:" + addr);
}
/**
* 将地址为addr的数据设为b
* 注意:这些内存地址中可能涉及到显存或屏幕缓冲区,该方法不负责通知相应组件<p>
* 应该自己调用intersectWithGraph()方法判断并做出相应反应
* @param addr 地址
* @param b 数据
* @throws IndexOutOfBoundsException 内存写越界
*/
public void setByte(int addr, sbyte b)
{
//Notice: 该实现与resetRamAddress的实现方式有关
if (addr >= runRam.getStartAddr())
{
runRam.setByte(addr, b);
return;
}
if (addr >= strRam.getStartAddr())
{
strRam.setByte(addr, b);
return;
}
for (int index = ramCount - 1; index >= 0; index--)
{
Ram.Ram ram = rams[index];
if (addr >= ram.getStartAddr())
{
ram.setByte(addr, b);
return;
}
}
//throw new IndexOutOfBoundsException("内存写越界:" + addr);
}
