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package com.android.connectivitymanagertest;
import android.net.NetworkInfo.State;
import android.util.Log;
import java.util.List;
import java.util.ArrayList;
public class NetworkState {
public static final int TO_DISCONNECTION = 0; // transition to disconnection
public static final int TO_CONNECTION = 1; // transition to connection
public static final int DO_NOTHING = -1; // no state change
private final String LOG_TAG = "NetworkState";
private List<State> mStateDepository;
private State mTransitionTarget;
private int mTransitionDirection;
private String mReason = null; // record mReason of state transition failure
public NetworkState() {
mStateDepository = new ArrayList<State>();
mTransitionDirection = DO_NOTHING;
mTransitionTarget = State.UNKNOWN;
}
public NetworkState(State currentState) {
mStateDepository = new ArrayList<State>();
mStateDepository.add(currentState);
mTransitionDirection = DO_NOTHING;
mTransitionTarget = State.UNKNOWN;
}
// Reinitialize the network state
public void resetNetworkState() {
mStateDepository.clear();
mTransitionDirection = DO_NOTHING;
mTransitionTarget = State.UNKNOWN;
}
// set the transition criteria, transitionDir could be:
// DO_NOTHING, TO_CONNECTION, TO_DISCONNECTION
public void setStateTransitionCriteria(State initState, int transitionDir, State targetState) {
if (!mStateDepository.isEmpty()) {
mStateDepository.clear();
}
mStateDepository.add(initState);
mTransitionDirection = transitionDir;
mTransitionTarget = targetState;
Log.v(LOG_TAG, "setStateTransitionCriteria: " + printStates());
}
public void recordState(State currentState) {
mStateDepository.add(currentState);
}
// Verify state transition
public boolean validateStateTransition() {
Log.v(LOG_TAG, "print state depository: " + printStates());
if (mTransitionDirection == DO_NOTHING) {
if (mStateDepository.isEmpty()) {
Log.v(LOG_TAG, "no state is recorded");
mReason = "no state is recorded.";
return false;
} else if (mStateDepository.size() > 1) {
Log.v(LOG_TAG, "no broadcast is expected, " +
"instead broadcast is probably received");
mReason = "no broadcast is expected, instead broadcast is probably received";
return false;
} else if (mStateDepository.get(0) != mTransitionTarget) {
Log.v(LOG_TAG, mTransitionTarget + " is expected, but it is " +
mStateDepository.get(0));
mReason = mTransitionTarget + " is expected, but it is " + mStateDepository.get(0);
return false;
}
return true;
} else if (mTransitionDirection == TO_CONNECTION) {
Log.v(LOG_TAG, "transition to CONNECTED");
return transitToConnection();
} else {
Log.v(LOG_TAG, "transition to DISCONNECTED");
return transitToDisconnection();
}
}
/*
* Transition from CONNECTED -> DISCONNECTED:
* CONNECTED->DISCONNECTING->DISCONNECTED
* return false if any state transition is not valid and save a message in mReason
*/
public boolean transitToDisconnection () {
mReason = "states: " + printStates();
if (mStateDepository.get(0) != State.CONNECTED) {
mReason += " initial state should be CONNECTED, but it is " +
mStateDepository.get(0) + ".";
return false;
}
State lastState = mStateDepository.get(mStateDepository.size() - 1);
if ( lastState != mTransitionTarget) {
mReason += " the last state should be DISCONNECTED, but it is " + lastState;
return false;
}
for (int i = 1; i < mStateDepository.size() - 1; i++) {
State preState = mStateDepository.get(i-1);
State curState = mStateDepository.get(i);
if ((preState == State.CONNECTED) && ((curState == State.DISCONNECTING) ||
(curState == State.DISCONNECTED))) {
continue;
} else if ((preState == State.DISCONNECTING) && (curState == State.DISCONNECTED)) {
continue;
} else if ((preState == State.DISCONNECTED) && (curState == State.DISCONNECTED)) {
continue;
} else {
mReason += " Transition state from " + preState.toString() + " to " +
curState.toString() + " is not valid.";
return false;
}
}
return true;
}
// DISCONNECTED->CONNECTING->CONNECTED
public boolean transitToConnection() {
mReason = "states: " + printStates();
if (mStateDepository.get(0) != State.DISCONNECTED) {
mReason += " initial state should be DISCONNECTED, but it is " +
mStateDepository.get(0) + ".";
return false;
}
State lastState = mStateDepository.get(mStateDepository.size() - 1);
if ( lastState != mTransitionTarget) {
mReason += " the last state should be CONNECTED, but it is " + lastState;
return false;
}
for (int i = 1; i < mStateDepository.size(); i++) {
State preState = mStateDepository.get(i-1);
State curState = mStateDepository.get(i);
if ((preState == State.DISCONNECTED) && ((curState == State.CONNECTING) ||
(curState == State.CONNECTED))) {
continue;
} else if ((preState == State.CONNECTING) && (curState == State.CONNECTED)) {
continue;
} else if ((preState == State.CONNECTED) && (curState == State.CONNECTED)) {
continue;
} else {
mReason += " Transition state from " + preState.toString() + " to " +
curState.toString() + " is not valid.";
return false;
}
}
return true;
}
public List<State> getTransitionStates() {
return mStateDepository;
}
// return state failure mReason
public String getReason() {
return mReason;
}
public String printStates() {
StringBuilder stateBuilder = new StringBuilder("");
for (int i = 0; i < mStateDepository.size(); i++) {
stateBuilder.append(" ").append(mStateDepository.get(i).toString()).append("->");
}
return stateBuilder.toString();
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder(" ");
builder.append("mTransitionDirection: ").append(Integer.toString(mTransitionDirection)).
append("; ").append("states:").
append(printStates()).append("; ");
return builder.toString();
}
}
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