/*
* SimpleSessionHistoryManager.java
*
* Created on June 27, 2007, 12:38 PM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package com.totsp.gwittir.client.flow;
import java.util.ArrayList;
import com.totsp.gwittir.client.log.Level;
import com.totsp.gwittir.client.log.Logger;
import com.totsp.gwittir.client.util.HistoryTokenizer;
/**
* A simple history manager that creates an inline List for each state change
* in the flow controller.
*
* This class will provide basic back-forward support without deep linking.
*
* @author <a href="mailto:cooper@screaming-penguin.com">Robert "kebernet"
* Cooper</a>
*/
public class SimpleSessionHistoryManager implements HistoryManager {
private static final Logger LOGGER = Logger.getLogger(SimpleSessionHistoryManager.class.toString());
private ArrayList<FlowEvent> states = new ArrayList<FlowEvent>();
private boolean ignoreNext = false;
private int currentState = -1;
/** Creates a new instance of SimpleSessionHistoryManager */
public SimpleSessionHistoryManager() {
}
public void apply(String historyToken) {
LOGGER.log(Level.DEBUG, "Apply "+historyToken, null);
HistoryTokenizer tok = new HistoryTokenizer(historyToken);
if ((tok.getToken("s") == null)
|| (Integer.parseInt(tok.getToken("s").toString()) == currentState)) {
return;
}
int targetState = Integer.parseInt(tok.getToken("s").toString());
LOGGER.log(
Level.SPAM,
"Repositioning to state: " + targetState + " of "
+ states.size() + "from " + currentState, null);
if(targetState >= states.size() ){
tok.setToken("s", ""+(states.size() -1));
return;
}
callState(targetState);
currentState = targetState;
}
private void callState(int index) {
ignoreNext = true;
if(currentState > index ){
for(int i = currentState; i > index; i--){
FlowEvent state = states.get(i);
LOGGER.log(Level.DEBUG, "calling "+state.getFromName(), null);
FlowController.call( state.getManagedWidget(),
state.getFromName(),
state.getFromModel() );
}
} else {
for(int i = currentState+1; i <= index; i++ ){
FlowEvent state = states.get(i);
FlowController.call( state.getManagedWidget(),
state.getToName(),
state.getToModel() );
}
}
ignoreNext = false;
}
public void transition(FlowEvent event, boolean appendHistory) {
if(ignoreNext)
return;
currentState++;
if( currentState == states.size() ){
states.add(event);
} else {
states.set(currentState, event);
}
if(appendHistory){
HistoryTokenizer tok = new HistoryTokenizer();
tok.begin();
tok.setToken("s", Integer.toString(currentState));
tok.commit();
}
}
}