/******************************************************************************* * Copyright 2011 Netflix * * 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 com.netflix.astyanax.shallows; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import com.netflix.astyanax.Serializer; import com.netflix.astyanax.model.AbstractColumnList; import com.netflix.astyanax.model.Column; public class EmptyColumnList<C> extends AbstractColumnList<C> { @SuppressWarnings("unchecked") @Override public Iterator<Column<C>> iterator() { return new EmptyIterator(); } @Override public Column<C> getColumnByName(C columnName) { return null; } @Override public Column<C> getColumnByIndex(int idx) { return null; } @Override public <C2> Column<C2> getSuperColumn(C columnName, Serializer<C2> colSer) { return null; } @Override public <C2> Column<C2> getSuperColumn(int idx, Serializer<C2> colSer) { return null; } @Override public boolean isEmpty() { return true; } @Override public int size() { return 0; } @Override public boolean isSuperColumn() { return false; } @Override public Collection<C> getColumnNames() { return new HashSet<C>(); } }