/**
* Wrap the corrector's channel corresponding to the specified handle.
*
* @param handle Description of the Parameter
* @return Description of the Return Value
*/
protected ChannelWrapper wrapChannel(final String handle) {
Channel channel = _powerSupply.getChannel(handle);
ChannelWrapper wrapper = new ChannelWrapper(channel);
wrapper.addChannelEventListener(
new ChannelEventListener() {
/**
* The PV's monitored value has changed.
*
* @param channel the channel whose value has changed
* @param record The channel time record of the new value
*/
public void valueChanged(Channel channel, ChannelTimeRecord record) {
_latestField = record.doubleValue();
EVENT_PROXY.fieldChanged(CorrectorSupply.this, record, _latestField);
}
/**
* The channel's connection has changed. Either it has established a new connection or the
* existing connection has dropped.
*
* @param channel The channel whose connection has changed.
* @param connected The channel's new connection state
*/
public void connectionChanged(Channel channel, boolean connected) {
_latestField = Double.NaN;
EVENT_PROXY.connectionChanged(CorrectorSupply.this, connected);
}
});
wrapper.requestConnection();
return wrapper;
}
/**
* Set the field to the value specified.
*
* @param field the field in Tesla
*/
public void requestFieldSetting(final double field) {
try {
_fieldWriteChannelWrapper.getChannel().putValCallback(field, PUT_HANDLER);
} catch (Exception exception) {
throw new RuntimeException("Field setting request exception.", exception);
}
}
/**
* Determine if this BPM's channels are all connected.
*
* @return true if this BPM is connected and false if not.
*/
public boolean isConnected() {
try {
return _fieldWriteChannelWrapper.isConnected();
} catch (NullPointerException exception) {
return false;
}
}
