/**
 * A base implementation of {@link NetworkConnections} for undirected networks.
 *
 * @author James Sexton
 * @param <N> Node parameter type
 * @param <E> Edge parameter type
 */
@ElementTypesAreNonnullByDefault
abstract class AbstractUndirectedNetworkConnections<N, E> implements NetworkConnections<N, E> {
  /** Keys are edges incident to the origin node, values are the node at the other end. */
  final Map<E, N> incidentEdgeMap;

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.lang;

/**
 * システムプロパティ用のユーティリティクラスです。
 *
 * @author wyukawa
 * @author shinsuke
 *
 */
public abstract class SystemUtil {

    /**
     * <code>file.encoding</code>システムプロパティ。例:UTF-8
     */
    public static final String FILE_ENCODING = System.getProperty("file.encoding");

    /**

 * under the License.
 */
package org.apache.maven.api;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

abstract class ExtensibleEnums {

    static Language language(String id) {
        return new DefaultLanguage(id);
    }

 *
 * @author Jesse Wilson
 * @author Luke Sandberg
 * @since 1.0
 */
@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
public abstract class AbstractService implements Service {
  private static final ListenerCallQueue.Event<Listener> STARTING_EVENT =
      new ListenerCallQueue.Event<Listener>() {
        @Override
        public void call(Listener listener) {

    }
    return ImmutableEnumMap.asImmutable(copy);
  }

  static final Entry<?, ?>[] EMPTY_ENTRY_ARRAY = new Entry<?, ?>[0];

  abstract static class IteratorBasedImmutableMap<K, V> extends ImmutableMap<K, V> {
    abstract UnmodifiableIterator<Entry<K, V>> entryIterator();

    Spliterator<Entry<K, V>> entrySpliterator() {
      return Spliterators.spliterator(
          entryIterator(),

   *     class under test.
   */
  protected abstract Map<K, V> makeEmptyMap() throws UnsupportedOperationException;

  /**
   * Creates a new, non-empty instance of the class under test.
   *
   * @return a new, non-empty map instance.
   * @throws UnsupportedOperationException if it's not possible to make a non-empty instance of the
   *     class under test.
   */

 * @since 2.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingSortedSet<E extends @Nullable Object> extends ForwardingSet<E>
    implements SortedSet<E> {

  /** Constructor for use by subclasses. */
  protected ForwardingSortedSet() {}

  @Override
  protected abstract SortedSet<E> delegate();

  @Override
  @CheckForNull
  public Comparator<? super E> comparator() {

import java.sql.ResultSet;
import java.sql.SQLException;

import org.codelibs.core.exception.SQLRuntimeException;

/**
 * {@link PreparedStatement}用のユーティリティクラスです。
 *
 * @author higa
 */
public abstract class PreparedStatementUtil {

    /**
     * クエリを実行します。
     *
     * @param ps
     *            {@link PreparedStatement}。{@literal null}であってはいけません
     * @return {@link ResultSet}

import org.codelibs.core.exception.InterruptedRuntimeException;
import org.codelibs.core.log.Logger;

/**
 * Utility class for Thread class
 *
 * @author shinsuke
 *
 */
public abstract class ThreadUtil {

    private static final Logger logger = Logger.getLogger(ThreadUtil.class);

    public static void sleep(final long millis) {
        if (millis < 1L) {
            return;
        }

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.cli.logging;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Abstract implementation.
 *
 * @since 3.1.0
 */
public class BaseSlf4jConfiguration implements Slf4jConfiguration {
    private static final Logger LOGGER = LoggerFactory.getLogger(BaseSlf4jConfiguration.class);