*     {@code null}) and returns {@code Optional.empty()} if it has none.
   */
  @SuppressWarnings("unchecked")
  public static <T> Collector<T, ?, Optional<T>> toOptional() {
    return (Collector) TO_OPTIONAL;
  }

  private static final Object NULL_PLACEHOLDER = new Object();

  private static final Collector<@Nullable Object, ?, @Nullable Object> ONLY_ELEMENT =
      Collector.<@Nullable Object, ToOptionalState, @Nullable Object>of(

    /**
     * 
     */
    public static final byte FILE_ENDOFFILE_INFO = 20;

    /**
     * 
     */
    public static final byte FILE_BASIC_INFO = 0x4;
    /**
     * 
     */
    public static final byte FILE_STANDARD_INFO = 0x5;

    /**
     * 
     */
    public static final byte FILE_INTERNAL_INFO = 0x6;

    /**
     * 
     */
    public static final byte FILE_RENAME_INFO = 10;

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

import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.ONE;
import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

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

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.notNullValue;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.CoreMatchers.sameInstance;
import static org.junit.Assert.assertThat;

import java.lang.reflect.Constructor;

import org.codelibs.core.beans.BeanDesc;

     */
    public static boolean consumerPom(@Nullable Session session) {
        return consumerPom(session != null ? session.getUserProperties() : null);
    }

    private static boolean doGet(Properties userProperties, String key, boolean def) {
        return doGet(userProperties != null ? userProperties.get(key) : null, def);
    }

 */
package org.codelibs.core.beans.factory;

import static org.codelibs.core.collection.ArrayIterator.iterable;
import static org.codelibs.core.collection.IndexedIterator.indexed;
import static org.codelibs.core.lang.GenericsUtil.getActualClass;
import static org.codelibs.core.lang.GenericsUtil.getGenericParameters;
import static org.codelibs.core.lang.GenericsUtil.getTypeVariableMap;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentArrayIndex;

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

package com.google.common.collect;

import static java.util.Arrays.asList;

import com.google.common.base.Function;
import com.google.common.collect.testing.CollectionTestSuiteBuilder;
import com.google.common.collect.testing.MinimalCollection;

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

package com.google.common.collect;

import static java.util.Arrays.asList;

import com.google.common.base.Function;
import com.google.common.collect.testing.QueueTestSuiteBuilder;
import com.google.common.collect.testing.TestStringQueueGenerator;

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

package com.google.common.collect;

import static com.google.common.truth.Truth.assertThat;
import static java.lang.Math.max;
import static java.util.Arrays.asList;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.SetTestSuiteBuilder;

 * limitations under the License.
 */

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

import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static java.util.Collections.nCopies;

import com.google.common.annotations.GwtCompatible;