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Java example source code file (AbstractTable.java)

This example Java source code file (AbstractTable.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, canignorereturnvalue, cell, cellset, collection, iterator, map, nullable, object, override, set, util, values, weakouter

The AbstractTable.java Java example source code

/*
 * Copyright (C) 2013 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 com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.j2objc.annotations.WeakOuter;

import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.annotation.Nullable;

/**
 * Skeletal, implementation-agnostic implementation of the {@link Table} interface.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
abstract class AbstractTable<R, C, V> implements Table {

  @Override
  public boolean containsRow(@Nullable Object rowKey) {
    return Maps.safeContainsKey(rowMap(), rowKey);
  }

  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return Maps.safeContainsKey(columnMap(), columnKey);
  }

  @Override
  public Set<R> rowKeySet() {
    return rowMap().keySet();
  }

  @Override
  public Set<C> columnKeySet() {
    return columnMap().keySet();
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    for (Map<C, V> row : rowMap().values()) {
      if (row.containsValue(value)) {
        return true;
      }
    }
    return false;
  }

  @Override
  public boolean contains(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = Maps.safeGet(rowMap(), rowKey);
    return row != null && Maps.safeContainsKey(row, columnKey);
  }

  @Override
  public V get(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = Maps.safeGet(rowMap(), rowKey);
    return (row == null) ? null : Maps.safeGet(row, columnKey);
  }

  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public void clear() {
    Iterators.clear(cellSet().iterator());
  }

  @CanIgnoreReturnValue
  @Override
  public V remove(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = Maps.safeGet(rowMap(), rowKey);
    return (row == null) ? null : Maps.safeRemove(row, columnKey);
  }

  @CanIgnoreReturnValue
  @Override
  public V put(R rowKey, C columnKey, V value) {
    return row(rowKey).put(columnKey, value);
  }

  @Override
  public void putAll(Table<? extends R, ? extends C, ? extends V> table) {
    for (Table.Cell<? extends R, ? extends C, ? extends V> cell : table.cellSet()) {
      put(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
    }
  }

  private transient Set<Cell cellSet;

  @Override
  public Set<Cell cellSet() {
    Set<Cell result = cellSet;
    return (result == null) ? cellSet = createCellSet() : result;
  }

  Set<Cell createCellSet() {
    return new CellSet();
  }

  abstract Iterator<Table.Cell cellIterator();

  @WeakOuter
  class CellSet extends AbstractSet<Cell {
    @Override
    public boolean contains(Object o) {
      if (o instanceof Cell) {
        Cell<?, ?, ?> cell = (Cell) o;
        Map<C, V> row = Maps.safeGet(rowMap(), cell.getRowKey());
        return row != null
            && Collections2.safeContains(
                row.entrySet(), Maps.immutableEntry(cell.getColumnKey(), cell.getValue()));
      }
      return false;
    }

    @Override
    public boolean remove(@Nullable Object o) {
      if (o instanceof Cell) {
        Cell<?, ?, ?> cell = (Cell) o;
        Map<C, V> row = Maps.safeGet(rowMap(), cell.getRowKey());
        return row != null
            && Collections2.safeRemove(
                row.entrySet(), Maps.immutableEntry(cell.getColumnKey(), cell.getValue()));
      }
      return false;
    }

    @Override
    public void clear() {
      AbstractTable.this.clear();
    }

    @Override
    public Iterator<Table.Cell iterator() {
      return cellIterator();
    }

    @Override
    public int size() {
      return AbstractTable.this.size();
    }
  }

  private transient Collection<V> values;

  @Override
  public Collection<V> values() {
    Collection<V> result = values;
    return (result == null) ? values = createValues() : result;
  }

  Collection<V> createValues() {
    return new Values();
  }

  Iterator<V> valuesIterator() {
    return new TransformedIterator<Cell(cellSet().iterator()) {
      @Override
      V transform(Cell<R, C, V> cell) {
        return cell.getValue();
      }
    };
  }

  @WeakOuter
  class Values extends AbstractCollection<V> {
    @Override
    public Iterator<V> iterator() {
      return valuesIterator();
    }

    @Override
    public boolean contains(Object o) {
      return containsValue(o);
    }

    @Override
    public void clear() {
      AbstractTable.this.clear();
    }

    @Override
    public int size() {
      return AbstractTable.this.size();
    }
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    return Tables.equalsImpl(this, obj);
  }

  @Override
  public int hashCode() {
    return cellSet().hashCode();
  }

  /**
   * Returns the string representation {@code rowMap().toString()}.
   */
  @Override
  public String toString() {
    return rowMap().toString();
  }
}

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