/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.entity;
  
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.UncheckedIOException;
  
  import org.apache.hc.core5.io.Closer;
  
  /**
   * Lazy initializes from an {@link InputStream} wrapper.
   */
  class LazyDecompressingInputStream extends FilterInputStream {
  
      private final InputStreamFactory inputStreamFactory;
  
      private InputStream wrapperStream;
  
      public LazyDecompressingInputStream(
              final InputStream wrappedStream,
              final InputStreamFactory inputStreamFactory) {
          super(wrappedStream);
          this.inputStreamFactory = inputStreamFactory;
      }
  
      private InputStream initWrapper() throws IOException {
          if (wrapperStream == null) {
              wrapperStream = inputStreamFactory.create(in);
          }
          return wrapperStream;
      }
  
      @Override
      public int read() throws IOException {
          return initWrapper().read();
      }
  
      @Override
      public int read(final byte[] b) throws IOException {
          return initWrapper().read(b);
      }
  
      @Override
      public int read(final byte[] b, final int off, final int len) throws IOException {
          return initWrapper().read(b, off, len);
      }
  
      @Override
      public long skip(final long n) throws IOException {
          return initWrapper().skip(n);
      }
  
      @Override
      public boolean markSupported() {
          return false;
      }
  
      @Override
      public int available() throws IOException {
          return initWrapper().available();
      }
  
      @Override
      public void close() throws IOException {
          try {
              Closer.close(wrapperStream);
          } finally {
              super.close();
          }
      }
  
      @Override
      public void mark(final int readlimit) {
         try {
             initWrapper().mark(readlimit);
         } catch (final IOException e) {
             throw new UncheckedIOException(e);
         }
     }
 
     @Override
     public void reset() throws IOException {
         initWrapper().reset();
     }
 }