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119 lines
2.7 KiB
119 lines
2.7 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "AHierarchicalStateMachine"
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#include <utils/Log.h>
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#include <media/stagefright/AHierarchicalStateMachine.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/foundation/AMessage.h>
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#include <utils/Vector.h>
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namespace android {
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AState::AState(const sp<AState> &parentState)
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: mParentState(parentState) {
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}
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AState::~AState() {
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}
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sp<AState> AState::parentState() {
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return mParentState;
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}
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void AState::stateEntered() {
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}
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void AState::stateExited() {
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}
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////////////////////////////////////////////////////////////////////////////////
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AHierarchicalStateMachine::AHierarchicalStateMachine() {
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}
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AHierarchicalStateMachine::~AHierarchicalStateMachine() {
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}
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void AHierarchicalStateMachine::handleMessage(const sp<AMessage> &msg) {
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sp<AState> save = mState;
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sp<AState> cur = mState;
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while (cur != NULL && !cur->onMessageReceived(msg)) {
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// If you claim not to have handled the message you shouldn't
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// have called setState...
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CHECK(save == mState);
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cur = cur->parentState();
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}
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if (cur != NULL) {
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return;
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}
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ALOGW("Warning message %s unhandled in root state.",
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msg->debugString().c_str());
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}
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void AHierarchicalStateMachine::changeState(const sp<AState> &state) {
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if (state == mState) {
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// Quick exit for the easy case.
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return;
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}
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Vector<sp<AState> > A;
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sp<AState> cur = mState;
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for (;;) {
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A.push(cur);
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if (cur == NULL) {
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break;
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}
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cur = cur->parentState();
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}
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Vector<sp<AState> > B;
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cur = state;
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for (;;) {
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B.push(cur);
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if (cur == NULL) {
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break;
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}
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cur = cur->parentState();
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}
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// Remove the common tail.
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while (A.size() > 0 && B.size() > 0 && A.top() == B.top()) {
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A.pop();
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B.pop();
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}
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mState = state;
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for (size_t i = 0; i < A.size(); ++i) {
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A.editItemAt(i)->stateExited();
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}
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for (size_t i = B.size(); i > 0;) {
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i--;
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B.editItemAt(i)->stateEntered();
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}
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}
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} // namespace android
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