persistence.antlr.debug.InputBufferEventSupport Maven / Gradle / Ivy
package persistence.antlr.debug;
import java.util.Vector;
import persistence.antlr.collections.impl.BitSet;
import persistence.antlr.RecognitionException;
public class InputBufferEventSupport {
private Object source;
private Vector inputBufferListeners;
private InputBufferEvent inputBufferEvent;
protected static final int CONSUME=0;
protected static final int LA=1;
protected static final int MARK=2;
protected static final int REWIND=3;
public InputBufferEventSupport(Object source) {
inputBufferEvent = new InputBufferEvent(source);
this.source = source;
}
public void addInputBufferListener(InputBufferListener l) {
if (inputBufferListeners == null) inputBufferListeners = new Vector();
inputBufferListeners.addElement(l);
}
public void fireConsume(char c) {
inputBufferEvent.setValues(InputBufferEvent.CONSUME, c, 0);
fireEvents(CONSUME, inputBufferListeners);
}
public void fireEvent(int type, ListenerBase l) {
switch(type) {
case CONSUME: ((InputBufferListener)l).inputBufferConsume(inputBufferEvent); break;
case LA: ((InputBufferListener)l).inputBufferLA(inputBufferEvent); break;
case MARK: ((InputBufferListener)l).inputBufferMark(inputBufferEvent); break;
case REWIND: ((InputBufferListener)l).inputBufferRewind(inputBufferEvent); break;
default:
throw new IllegalArgumentException("bad type "+type+" for fireEvent()");
}
}
public void fireEvents(int type, Vector listeners) {
Vector targets=null;
ListenerBase l=null;
synchronized (this) {
if (listeners == null) return;
targets = (Vector)listeners.clone();
}
if (targets != null)
for (int i = 0; i < targets.size(); i++) {
l = (ListenerBase)targets.elementAt(i);
fireEvent(type, l);
}
}
public void fireLA(char c, int la) {
inputBufferEvent.setValues(InputBufferEvent.LA, c, la);
fireEvents(LA, inputBufferListeners);
}
public void fireMark(int pos) {
inputBufferEvent.setValues(InputBufferEvent.MARK, ' ', pos);
fireEvents(MARK, inputBufferListeners);
}
public void fireRewind(int pos) {
inputBufferEvent.setValues(InputBufferEvent.REWIND, ' ', pos);
fireEvents(REWIND, inputBufferListeners);
}
public Vector getInputBufferListeners() {
return inputBufferListeners;
}
protected void refresh(Vector listeners) {
Vector v;
synchronized (listeners) {
v = (Vector)listeners.clone();
}
if (v != null)
for (int i = 0; i < v.size(); i++)
((ListenerBase)v.elementAt(i)).refresh();
}
public void refreshListeners() {
refresh(inputBufferListeners);
}
public void removeInputBufferListener(InputBufferListener l) {
if (inputBufferListeners != null)
inputBufferListeners.removeElement(l);
}
}