77 lines
2.1 KiB
Java
77 lines
2.1 KiB
Java
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/*
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* Copyright (C) 2009 The Guava Authors
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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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package com.google.common.collect;
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import static com.google.common.base.Preconditions.checkNotNull;
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import java.util.Map;
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import com.google.common.annotations.GwtCompatible;
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/**
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* An implementation of {@link ImmutableTable} that holds a single cell.
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*
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* @author Gregory Kick
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*/
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@GwtCompatible
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class SingletonImmutableTable<R, C, V> extends ImmutableTable<R, C, V> {
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final R singleRowKey;
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final C singleColumnKey;
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final V singleValue;
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SingletonImmutableTable(R rowKey, C columnKey, V value) {
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this.singleRowKey = checkNotNull(rowKey);
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this.singleColumnKey = checkNotNull(columnKey);
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this.singleValue = checkNotNull(value);
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}
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SingletonImmutableTable(Cell<R, C, V> cell) {
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this(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
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}
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@Override
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public ImmutableMap<R, V> column(C columnKey) {
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checkNotNull(columnKey);
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return containsColumn(columnKey) ? ImmutableMap.of(singleRowKey, singleValue) : ImmutableMap.<R, V>of();
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}
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@Override
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public ImmutableMap<C, Map<R, V>> columnMap() {
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return ImmutableMap.of(singleColumnKey, (Map<R, V>) ImmutableMap.of(singleRowKey, singleValue));
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}
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@Override
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public ImmutableMap<R, Map<C, V>> rowMap() {
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return ImmutableMap.of(singleRowKey, (Map<C, V>) ImmutableMap.of(singleColumnKey, singleValue));
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}
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@Override
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public int size() {
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return 1;
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}
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@Override
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ImmutableSet<Cell<R, C, V>> createCellSet() {
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return ImmutableSet.of(cellOf(singleRowKey, singleColumnKey, singleValue));
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}
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@Override
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ImmutableCollection<V> createValues() {
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return ImmutableSet.of(singleValue);
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}
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}
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