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 com.onegravity.rteditor.utils.io.input;
  
  import java.io.InputStream;
  
  /**
   * Closed input stream. This stream returns -1 to all attempts to read
   * something from the stream.
   * <p>
   * Typically uses of this class include testing for corner cases in methods
   * that accept input streams and acting as a sentinel value instead of a
   * {@code null} input stream.
   *
   * @version $Id: ClosedInputStream.java 1307459 2012-03-30 15:11:44Z ggregory $
   * @since 1.4
   */
  public class ClosedInputStream extends InputStream {
      
      /**
       * A singleton.
       */
      public static final ClosedInputStream CLOSED_INPUT_STREAM = new ClosedInputStream();
  
      /**
       * Returns -1 to indicate that the stream is closed.
       *
       * @return always -1
       */
      @Override
      public int read() {
          return -1;
      }
  
  }
  