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.beam.sdk.util;
  
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.MoreObjects;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * A {@link OutputStream} wrapper which protects against the user attempting to modify the
   * underlying stream by closing it or using mark.
   */
  @Internal
  public class UnownedInputStream extends FilterInputStream {
    public UnownedInputStream(InputStream delegate) {
      super(delegate);
    }
  
    @Override
    public void close() throws IOException {
      throw new UnsupportedOperationException(
          "Caller does not own the underlying input stream " + " and should not call close().");
    }
  
    @Override
    public boolean equals(@Nullable Object obj) {
      return obj instanceof UnownedInputStream && ((UnownedInputStream) obj).in.equals(in);
    }
  
    @Override
    public int hashCode() {
      return in.hashCode();
    }
  
    @SuppressWarnings("UnsynchronizedOverridesSynchronized")
    @Override
    public void mark(int readlimit) {
      throw new UnsupportedOperationException(
          "Caller does not own the underlying input stream " + " and should not call mark().");
    }
  
    @Override
    public boolean markSupported() {
      return false;
    }
  
    @SuppressWarnings("UnsynchronizedOverridesSynchronized")
    @Override
    public void reset() throws IOException {
      throw new UnsupportedOperationException(
          "Caller does not own the underlying input stream " + " and should not call reset().");
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(UnownedInputStream.class).add("in", in).toString();
    }
  }
  