Java tutorial
/* * Copyright 2014 Chris Banes * * 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 app.philm.in.controllers; import com.google.common.base.Preconditions; import android.content.Intent; import app.philm.in.Display; abstract class BaseController { private Display mDisplay; private boolean mInited; public final void init() { Preconditions.checkState(mInited == false, "Already inited"); mInited = true; onInited(); } public final void suspend() { Preconditions.checkState(mInited == true, "Not inited"); onSuspended(); mInited = false; } public final boolean isInited() { return mInited; } protected void onInited() { } protected void onSuspended() { } public boolean handleIntent(Intent intent) { return false; } protected void setDisplay(Display display) { mDisplay = display; } protected final Display getDisplay() { return mDisplay; } protected final void assertInited() { Preconditions.checkState(mInited, "Must be init'ed to perform action"); } }