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/*
* Copyright (C) 2009 The Guava Authors
*
* 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.google.common.collect;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Objects;
import java.util.Map;
import javax.annotation.Nullable;
/**
* An implementation of {@link ImmutableTable} that holds a single cell.
*
* @author Gregory Kick
*/
@GwtCompatible
final class SingletonImmutableTable<R, C, V> extends ImmutableTable<R, C, V> {
private final R singleRowKey;
private final C singleColumnKey;
private final V singleValue;
SingletonImmutableTable(R rowKey, C columnKey, V value) {
this.singleRowKey = checkNotNull(rowKey);
this.singleColumnKey = checkNotNull(columnKey);
this.singleValue = checkNotNull(value);
}
SingletonImmutableTable(Cell<R, C, V> cell) {
this(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
}
@Override public ImmutableSet<Cell<R, C, V>> cellSet() {
return ImmutableSet.of(
Tables.immutableCell(singleRowKey, singleColumnKey, singleValue));
}
@Override public ImmutableMap<R, V> column(C columnKey) {
checkNotNull(columnKey);
return containsColumn(columnKey)
? ImmutableMap.of(singleRowKey, singleValue)
: ImmutableMap.<R, V>of();
}
@Override public ImmutableSet<C> columnKeySet() {
return ImmutableSet.of(singleColumnKey);
}
@Override public ImmutableMap<C, Map<R, V>> columnMap() {
return ImmutableMap.of(singleColumnKey,
(Map<R, V>) ImmutableMap.of(singleRowKey, singleValue));
}
@Override public boolean contains(@Nullable Object rowKey,
@Nullable Object columnKey) {
return containsRow(rowKey) && containsColumn(columnKey);
}
@Override public boolean containsColumn(@Nullable Object columnKey) {
return Objects.equal(this.singleColumnKey, columnKey);
}
@Override public boolean containsRow(@Nullable Object rowKey) {
return Objects.equal(this.singleRowKey, rowKey);
}
@Override public boolean containsValue(@Nullable Object value) {
return Objects.equal(this.singleValue, value);
}
@Override public V get(@Nullable Object rowKey, @Nullable Object columnKey) {
return contains(rowKey, columnKey) ? singleValue : null;
}
@Override public boolean isEmpty() {
return false;
}
@Override public ImmutableMap<C, V> row(R rowKey) {
checkNotNull(rowKey);
return containsRow(rowKey)
? ImmutableMap.of(singleColumnKey, singleValue)
: ImmutableMap.<C, V>of();
}
@Override public ImmutableSet<R> rowKeySet() {
return ImmutableSet.of(singleRowKey);
}
@Override public ImmutableMap<R, Map<C, V>> rowMap() {
return ImmutableMap.of(singleRowKey,
(Map<C, V>) ImmutableMap.of(singleColumnKey, singleValue));
}
@Override public int size() {
return 1;
}
@Override public ImmutableCollection<V> values() {
return ImmutableSet.of(singleValue);
}
@Override public boolean equals(@Nullable Object obj) {
if (obj == this) {
return true;
} else if (obj instanceof Table) {
Table<?, ?, ?> that = (Table<?, ?, ?>) obj;
if (that.size() == 1) {
Cell<?, ?, ?> thatCell = that.cellSet().iterator().next();
return Objects.equal(this.singleRowKey, thatCell.getRowKey()) &&
Objects.equal(this.singleColumnKey, thatCell.getColumnKey()) &&
Objects.equal(this.singleValue, thatCell.getValue());
}
}
return false;
}
@Override public int hashCode() {
return Objects.hashCode(singleRowKey, singleColumnKey, singleValue);
}
@Override public String toString() {
return new StringBuilder()
.append('{')
.append(singleRowKey)
.append("={")
.append(singleColumnKey)
.append('=')
.append(singleValue)
.append("}}")
.toString();
}
}
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