/* * Copyright (C) 2012, 2016 higherfrequencytrading.com * Copyright (C) 2016 Roman Leventov * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package net.openhft.chronicle.map.impl.stage.ret; import net.openhft.chronicle.hash.Data; import net.openhft.chronicle.map.impl.ret.InstanceReturnValue; import net.openhft.sg.Staged; import org.jetbrains.annotations.NotNull; @Staged public abstract class DefaultReturnValue<V> implements InstanceReturnValue<V> { private V defaultReturnedValue = null; abstract boolean defaultReturnedValueInit(); private void initDefaultReturnedValue(@NotNull Data<V> value) { defaultReturnedValue = value.getUsing(null); } @Override public void returnValue(@NotNull Data<V> value) { initDefaultReturnedValue(value); } @Override public V returnValue() { if (defaultReturnedValueInit()) { return defaultReturnedValue; } else { return null; } } }