return Collections.unmodifiableCollection(collection);
  }

  @Override
  public void clear() {
    // Clear each collection, to make previously returned collections empty.
    for (Collection<V> collection : map.values()) {
      collection.clear();
    }
    map.clear();
    totalSize = 0;
  }

  // Views

  /**
   * {@inheritDoc}
   *

 */
package org.codelibs.fess.crawler.util;

import java.util.Collections;
import java.util.Map;

import org.apache.groovy.util.Maps;
import org.codelibs.fess.unit.UnitFessTestCase;

public class FieldConfigsTest extends UnitFessTestCase {
    public void test_empty() {
        final FieldConfigs fieldConfigs = new FieldConfigs(Collections.emptyMap());
        assertTrue(fieldConfigs.getConfig("test").isEmpty());
    }

    }

    protected ResolutionNode createResolutionNode(Artifact artifact) {
        return new ResolutionNode(artifact, Collections.emptyList());
    }

    protected ResolutionNode createResolutionNode(Artifact artifact, ResolutionNode parent) {
        return new ResolutionNode(artifact, Collections.emptyList(), parent);
    }

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import static java.util.Collections.emptySet;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Multiset;
import com.google.common.collect.testing.features.Feature;

 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.Collections.singletonMap;

import org.jspecify.annotations.Nullable;

/**
 * GWT emulation of {@link SingletonImmutableBiMap}.
 *
 * @author Hayward Chan
 */

 * limitations under the License.
 */

package com.google.common.collect.testing;

import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Collections.singletonMap;
import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;
import static junit.framework.Assert.fail;

import static java.util.Arrays.asList;
import static java.util.Collections.singleton;
import static java.util.Comparator.comparing;
import static java.util.Comparator.naturalOrder;
import static java.util.Comparator.reverseOrder;

import com.google.common.annotations.GwtCompatible;
import com.google.common.testing.EqualsTester;
import java.util.Collections;
import java.util.Comparator;
import java.util.Optional;

    this.exceptions = Collections.unmodifiableCollection(temp);
  }

  /** See {@link #create(Collection)}. */
  static RuntimeException create(Throwable... exceptions) {
    ArrayList<Throwable> temp = new ArrayList<>(Arrays.asList(exceptions));
    return create(temp);
  }

  /**
   * Given a collection of exceptions, returns a {@link RuntimeException}, with the following rules:
   *

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.util.Collections;
import java.util.Set;
import org.jspecify.annotations.Nullable;

/** Implementation of an {@link Optional} not containing a reference. */
@GwtCompatible
final class Absent<T> extends Optional<T> {

 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.Multisets.UnmodifiableMultiset;
import java.util.Collections;
import java.util.Comparator;
import java.util.SortedSet;
import org.jspecify.annotations.Nullable;

/**
 * Implementation of {@link Multisets#unmodifiableSortedMultiset(SortedMultiset)} for GWT.
 *