content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.commons.internal;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.PrintStream;
  import java.io.Writer;
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Method;
  
  import org.springframework.context.annotation.Primary;
  
  import lombok.experimental.UtilityClass;
  
  /**
   * <h1>- internal use only -</h1>
   * <p>
   * A collection of commonly used constants.
   * </p>
   * <p>
   * <b>WARNING</b>: Do <b>NOT</b> use any of the classes provided by this package! <br/>
   * These may be changed or removed without notice!
   * </p>
   *
   * @since 2.0
   */
  @UtilityClass
  public final class _Constants {
  
      /**
       * Convenient e.g. for reflective invocation
       */
      public final Object[] emptyObjects = new Object[0];
  
      /**
       * Convenient e.g. for reflective invocation
       */
      public final Class<?>[] emptyClasses = new Class[0];
  
      /**
       * Convenient e.g. for reflective invocation
       */
      public final Class<?>[] classesOfObject = new Class[] { Object.class };
  
      /**
       * Convenient e.g. for toArray conversions
       */
      public final String[] emptyStringArray = new String[0];
  
      /**
       * empty array of byte
       */
      public final byte[] emptyBytes = new byte[0];
  
      /**
       * empty array of Annotation
       */
      public final Annotation[] emptyAnnotations = new Annotation[0];
  
      public final Method[] nonFinalObjectMethods = nonFinalObjectMethods();
      private final Method[] nonFinalObjectMethods() {
          try {
              return new Method[] {
                  Object.class.getMethod("toString"),
                  Object.class.getMethod("hashCode"),
                  Object.class.getMethod("equals", classesOfObject)};
          } catch (NoSuchMethodException | SecurityException e) {
              throw new RuntimeException(e);
          }
      }
  
      /**
       * Writer that does nothing
       */
      public final Writer nopWriter = new Writer() {
          @Override public void write(final char[] cbuf, final int off, final int len) throws IOException { }
          @Override public void flush() throws IOException { }
          @Override public void close() throws IOException { }
      };
  
      /**
       * OutputStream that does nothing
       */
      public final OutputStream nopOutputStream = new OutputStream() {
          @Override public void write(final int b) throws IOException { }
      };
  
      /**
       * PrintStream that does nothing
       */
      public final PrintStream nopPrintStream = new PrintStream(nopOutputStream);
  
      @Primary private final class PrimaryAnnotated {}
      public final Primary ANNOTATION_PRIMARY = PrimaryAnnotated.class.getAnnotation(Primary.class);
  
  }
  