com.google.cloud.dataflow.sdk.util.UnownedOutputStream Maven / Gradle / Ivy

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Google Cloud Dataflow Java SDK provides a simple, Java-based interface for processing virtually any size data using Google cloud resources. This artifact includes entire Dataflow Java SDK.

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * Licensed 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.google.cloud.dataflow.sdk.util;

import com.google.common.base.MoreObjects;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * A {@link OutputStream} wrapper which protects against the user attempting to modify
 * the underlying stream by closing it.
 */
public class UnownedOutputStream extends FilterOutputStream {
  public UnownedOutputStream(OutputStream delegate) {
    super(delegate);
  }

  @Override
  public void close() throws IOException {
    throw new UnsupportedOperationException("Caller does not own the underlying output stream "
        + " and should not call close().");
  }

  @Override
  public boolean equals(Object obj) {
    return obj instanceof UnownedOutputStream
        && ((UnownedOutputStream) obj).out.equals(out);
  }

  @Override
  public int hashCode() {
    return out.hashCode();
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(UnownedOutputStream.class).add("out", out).toString();
  }
}