|
package
com.zte.liu.statemachine;
import
java.util.ArrayList;
import
java.util.HashMap;
import
com.zte.liu.messagehandler.Handler;
import
com.zte.liu.messagehandler.Looper;
import
com.zte.liu.messagehandler.Message;
import
com.zte.liu.messagehandler.MessageQueue;
public
class
HsmHandler extends
Handler {
private
HashMap<HierarchicalState, StateInfo> mStateInfo = new
HashMap<HierarchicalState, StateInfo>();
private
HierarchicalState mInitialState = null;
private
HierarchicalState mDestState = null;
private
ArrayList<StateInfo> mInitialStateList = new
ArrayList<StateInfo>();
private
ArrayList<Message> mDeferredMessages = new
ArrayList<Message>();
public
HsmHandler(Looper looper) {
super(looper);
}
private
class
StateInfo{
HierarchicalState
state;
HierarchicalState
parentState;
boolean
active;
}
public
void
addState(HierarchicalState state, HierarchicalState parentState){//只在非多线程情况
if(state
== null){
throw
new
RuntimeException("state
cannot be null when adding state.");
}
/*
if(mStateInfo.containsKey(state) && mStateInfo.get(state).parentState!=parentState){
throw
new RuntimeException("we cannot add a state with different parents.");
}
*/
if(mStateInfo.containsKey(state)){
return;
}
StateInfo
stateInfo = new
StateInfo();
stateInfo.state
= state;
stateInfo.parentState
= parentState;
stateInfo.active
= false;
mStateInfo.put(state,
stateInfo);
}
public
void
setInitialState(HierarchicalState state){
if(!mStateInfo.containsKey(state)){
throw
new
RuntimeException("cannot
set a initial state which is not contained in the build tree.");
}
mInitialState
= state;
}
public
void
completeConstruction(){
if(mInitialState
== null){
return;
}
StateInfo
initialStateInfo = mStateInfo.get(mInitialState);
while(initialStateInfo
!= null){
mInitialStateList.add(initialStateInfo);
if(initialStateInfo.parentState
== null){
initialStateInfo
= null;
}else{
initialStateInfo
= mStateInfo.get(initialStateInfo.parentState);
}
}
invokeEnterMethods(null);
performTransitions();
}
public
void
invokeEnterMethods(StateInfo commonStateInfo){
int
start = mInitialStateList.size() - 1;
for(int
i=mInitialStateList.size()-1;
i>=0;
i--){
if(mInitialStateList.get(i)
== commonStateInfo){
start
= i - 1;
break;
}
}
for(int
i=start; i>=0;
i--){
StateInfo
stateInfo = mInitialStateList.get(i);
stateInfo.state.enter();
stateInfo.active
= true;
}
}
public
void
invokeExitMethods(StateInfo commonStateInfo){
for(int
i=0;
i<mInitialStateList.size()-1;
i++){
StateInfo
stateInfo = (StateInfo)mInitialStateList.get(i);
if(stateInfo
!= commonStateInfo){
stateInfo.state.exit();
stateInfo.active
= false;
}else{
break;
}
}
}
public
void
performTransitions(){
if(mDestState
== null){
return;
}
ArrayList<StateInfo>
tempList = new
ArrayList<StateInfo>();
StateInfo
commonStateInfo = getCommonStateInfo(mDestState, tempList);
invokeExitMethods(commonStateInfo);
refreshInitialStateList(commonStateInfo,
tempList);
invokeEnterMethods(commonStateInfo);
moveDeferredMsgAtFrontQueue();
}
public
void
deferMessage(Message msg){
mDeferredMessages.add(msg);
}
public
void
handleMessage(Message msg){//重写！！
///////////////////////////////////////
//////////////////////////////////////
}
public
void
transitionTo(HierarchicalState destState){
mDestState
= destState;
}
private
StateInfo getCommonStateInfo(HierarchicalState destState, ArrayList<StateInfo> tempList){
StateInfo
stateInfo = mStateInfo.get(destState);
while(stateInfo!=null
&& stateInfo.active==false){
tempList.add(stateInfo);
if(stateInfo.parentState
== null){
stateInfo
= null;
}else{
stateInfo
= mStateInfo.get(stateInfo.parentState);
}
}
return
stateInfo;
}
private
void
refreshInitialStateList(StateInfo commonStateInfo, ArrayList<StateInfo> tempList){
for(int
i=0;
i<mInitialStateList.size()-1;
i++){
if(mInitialStateList.get(i)
!= commonStateInfo){
mInitialStateList.remove(i);
}
}
for(int
i=tempList.size()-1;
i>=0;
i--){
mInitialStateList.add(0,
tempList.get(i));
}
}
private
void
moveDeferredMsgAtFrontQueue(){
MessageQueue
msgQueue = this.getLooper().getQueue();
for(int
i=mDeferredMessages.size()-1;
i>=0;
i--){
msgQueue.addToFront(mDeferredMessages.get(i));
}
}
}
|
