com.google.common.collect.StandardRowSortedTable Maven / Gradle / Ivy

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/*
 * Copyright (C) 2008 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.Supplier;

import java.util.Comparator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;

/**
 * Implementation of {@code Table} whose iteration ordering across row keys is
 * sorted by their natural ordering or by a supplied comparator. Note that
 * iterations across the columns keys for a single row key may or may not be
 * ordered, depending on the implementation. When rows and columns are both
 * sorted, it's easier to use the {@link TreeBasedTable} subclass.
 *
 * The {@link #rowKeySet} method returns a {@link SortedSet} and the {@link
 * #rowMap} method returns a {@link SortedMap}, instead of the {@link Set} and
 * {@link Map} specified by the {@link Table} interface.
 *
 * 
Null keys and values are not supported.
 *
 * 
See the {@link StandardTable} superclass for more information about the
 * behavior of this class.
 *
 * @author Jared Levy
 */
@GwtCompatible
class StandardRowSortedTable extends StandardTable
    implements RowSortedTable {
  /*
   * TODO(jlevy): Consider adding headTable, tailTable, and subTable methods,
   * which return a Table view with rows keys in a given range. Create a
   * RowSortedTable subinterface with the revised methods?
   */

  StandardRowSortedTable(SortedMap> backingMap,
      Supplier> factory) {
    super(backingMap, factory);
  }

  private SortedMap> sortedBackingMap() {
    return (SortedMap>) backingMap;
  }

  /**
   * {@inheritDoc}
   *
   * 
This method returns a {@link SortedSet}, instead of the {@code Set}
   * specified in the {@link Table} interface.
   */
  @Override public SortedSet rowKeySet() {
    return (SortedSet) rowMap().keySet();
  }

  /**
   * {@inheritDoc}
   *
   * This method returns a {@link SortedMap}, instead of the {@code Map}
   * specified in the {@link Table} interface.
   */
  @Override public SortedMap> rowMap() {
    return (SortedMap>) super.rowMap();
  }

  @Override
  SortedMap> createRowMap() {
    return new RowSortedMap();
  }

  private class RowSortedMap extends RowMap implements SortedMap> {
    @Override
    public SortedSet keySet() {
      return (SortedSet) super.keySet();
    }

    @Override
    SortedSet createKeySet() {
      return new Maps.SortedKeySet>(this);
    }

    @Override
    public Comparator comparator() {
      return sortedBackingMap().comparator();
    }

    @Override
    public R firstKey() {
      return sortedBackingMap().firstKey();
    }

    @Override
    public R lastKey() {
      return sortedBackingMap().lastKey();
    }

    @Override
    public SortedMap> headMap(R toKey) {
      checkNotNull(toKey);
      return new StandardRowSortedTable(
          sortedBackingMap().headMap(toKey), factory).rowMap();
    }

    @Override
    public SortedMap> subMap(R fromKey, R toKey) {
      checkNotNull(fromKey);
      checkNotNull(toKey);
      return new StandardRowSortedTable(
          sortedBackingMap().subMap(fromKey, toKey), factory).rowMap();
    }

    @Override
    public SortedMap> tailMap(R fromKey) {
      checkNotNull(fromKey);
      return new StandardRowSortedTable(
          sortedBackingMap().tailMap(fromKey), factory).rowMap();
    }
  }

  private static final long serialVersionUID = 0;
}