hobby.wei.c.framework.EventDelegater.java Source code

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Here is the source code for hobby.wei.c.framework.EventDelegater.java

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/*
 * Copyright (C) 2014-present, Wei Chou (weichou2010@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package hobby.wei.c.framework;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;

/**
 * @author  Wei Chou(weichou2010@gmail.com)
 */
public class EventDelegater {
    private final static String KEY_BUNDLE_EVENT = AbsApp.get()
            .withPackageNamePrefix(EventDelegater.class.getName());

    public static enum PeriodMode {
        PAUSE_RESUME, START_STOP;
    }

    private final Map<String, EventSession> mLocalBroadcastEvent = new HashMap<String, EventSession>();
    private final Map<String, EventSession> mGlobalBroadcastEvent = new HashMap<String, EventSession>();

    private Context mContext;
    private boolean mStarted = false;
    private boolean mResumed = false;

    /*package*/ EventDelegater(Context context) {
        mContext = context;
    }

    /*package*/ void onStart() {
        mStarted = true;
        registerReceiver(PeriodMode.START_STOP);
    }

    /**{@link android.app.Fragment#onActivityCreated(Bundle) Fragment}?Activity?Fragment?**/
    /*package*/ void onActivityCreated(Context context) {
        unregisterReceiver(PeriodMode.PAUSE_RESUME);
        unregisterReceiver(PeriodMode.START_STOP);
        mContext = context;
        //????
        registerReceiver(PeriodMode.START_STOP);
        registerReceiver(PeriodMode.PAUSE_RESUME);
    }

    /*package*/ void onResume() {
        mResumed = true;
        registerReceiver(PeriodMode.PAUSE_RESUME);
    }

    /*package*/ void onPause() {
        mResumed = false;
        unregisterReceiver(PeriodMode.PAUSE_RESUME);
    }

    /*package*/ void onStop() {
        mStarted = false;
        unregisterReceiver(PeriodMode.START_STOP);
    }

    public static void sendLocalEvent(Context context, String eventName, Bundle data) {
        Intent intent = new Intent(AbsApp.get().withPackageNamePrefix(eventName));
        if (data != null)
            intent.putExtra(KEY_BUNDLE_EVENT, data);
        LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
    }

    public static void sendGlobalEvent(Context context, String eventName, Bundle data) {
        Intent intent = new Intent(AbsApp.get().withPackageNamePrefix(eventName));
        if (data != null)
            intent.putExtra(KEY_BUNDLE_EVENT, data);
        context.sendBroadcast(intent);
    }

    public void hostingLocalEventReceiver(String eventName, PeriodMode periodMode, EventReceiver receiver) {
        EventSession session = new EventSession(true, eventName, periodMode, receiver);
        EventSession session1 = mLocalBroadcastEvent.put(eventName, session);
        if (session1 != null)
            unregisterReceiver(session1);
        registerReceiver(session);
    }

    public void hostingGlobalEventReceiver(String eventName, PeriodMode periodMode, EventReceiver receiver) {
        EventSession session = new EventSession(false, eventName, periodMode, receiver);
        EventSession session1 = mGlobalBroadcastEvent.put(eventName, session);
        if (session1 != null)
            unregisterReceiver(session1);
        registerReceiver(session);
    }

    public void unhostingLocalEventReceiver(String eventName) {
        EventSession session = mLocalBroadcastEvent.remove(eventName);
        if (session != null)
            unregisterReceiver(session);
    }

    public void unhostingGlobalEventReceiver(String eventName) {
        EventSession session = mGlobalBroadcastEvent.remove(eventName);
        if (session != null)
            unregisterReceiver(session);
    }

    private void registerReceiver(PeriodMode periodMode) {
        Collection<EventSession> sessions = mLocalBroadcastEvent.values();
        for (EventSession session : sessions) {
            if (session.mPeriodMode == periodMode) {
                registerReceiver(session);
            }
        }
        sessions = mGlobalBroadcastEvent.values();
        for (EventSession session : sessions) {
            if (session.mPeriodMode == periodMode) {
                registerReceiver(session);
            }
        }
    }

    private void registerReceiver(EventSession session) {
        if (session.mPeriodMode == PeriodMode.START_STOP && mStarted
                || session.mPeriodMode == PeriodMode.PAUSE_RESUME && mResumed) {
            session.makeBroadcastReceiver();
            session.makeIntentFilter();
            try { //????
                if (session.mLocal) {
                    LocalBroadcastManager.getInstance(mContext).registerReceiver(session.mBroadcastReceiver,
                            session.mIntentFilter);
                } else {
                    mContext.registerReceiver(session.mBroadcastReceiver, session.mIntentFilter);
                }
            } catch (Exception e) {
            }
        }
    }

    private void unregisterReceiver(PeriodMode periodMode) {
        Collection<EventSession> sessions = mLocalBroadcastEvent.values();
        for (EventSession session : sessions) {
            if (session.mPeriodMode == periodMode) {
                unregisterReceiver(session);
            }
        }
        sessions = mGlobalBroadcastEvent.values();
        for (EventSession session : sessions) {
            if (session.mPeriodMode == periodMode) {
                unregisterReceiver(session);
            }
        }
    }

    private void unregisterReceiver(EventSession session) {
        if (session.mBroadcastReceiver != null) {
            try { //?????
                if (session.mLocal) {
                    LocalBroadcastManager.getInstance(mContext).unregisterReceiver(session.mBroadcastReceiver);
                } else {
                    mContext.unregisterReceiver(session.mBroadcastReceiver);
                }
            } catch (Exception e) {
            }
            session.mBroadcastReceiver = null;
            session.mIntentFilter = null;
        }
    }

    private static class EventSession {
        private final boolean mLocal;
        private final PeriodMode mPeriodMode;
        private final String mEventName;
        private final EventReceiver mReceiver;
        private BroadcastReceiver mBroadcastReceiver;
        private IntentFilter mIntentFilter;

        public EventSession(boolean local, String eventName, PeriodMode periodMode, EventReceiver receiver) {
            mLocal = local;
            mPeriodMode = periodMode;
            mEventName = eventName;
            mReceiver = receiver;
        }

        public void makeBroadcastReceiver() {
            if (mBroadcastReceiver == null) {
                mBroadcastReceiver = new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                        mReceiver.onEvent(intent.getBundleExtra(KEY_BUNDLE_EVENT));
                    }
                };
            }
        }

        public void makeIntentFilter() {
            if (mIntentFilter == null) {
                mIntentFilter = new IntentFilter(AbsApp.get().withPackageNamePrefix(mEventName));
            }
        }

        @Override
        public int hashCode() {
            return mEventName.hashCode();
        }

        @Override
        public boolean equals(Object o) {
            return mEventName.equals(((EventSession) o).mEventName);
        }
    }

    public static interface EventReceiver {
        void onEvent(Bundle data);
    }
}